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Merge commit '20ce69b9a6' into clippy-subtree-update

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Philipp Krones 2025-09-18 17:21:44 +02:00
parent 2267234673
commit 47bcee4ee2
163 changed files with 4388 additions and 2487 deletions
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4
.github/ISSUE_TEMPLATE/new_lint.yml vendored
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@ -1,7 +1,5 @@
name: New lint suggestion
description: |
Suggest a new Clippy lint (currently not accepting new lints)
Check out the Clippy book for more information about the feature freeze.
description: Suggest a new Clippy lint.
labels: ["A-lint"]
body:
- type: markdown

4
.github/PULL_REQUEST_TEMPLATE.md vendored
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@ -32,10 +32,6 @@ order to get feedback.
Delete this line and everything above before opening your PR.
Note that we are currently not taking in new PRs that add new lints. We are in a
feature freeze. Check out the book for more information. If you open a
feature-adding pull request, its review will be delayed.
---
*Please write a short comment explaining your change (or "none" for internal only changes)*

45
.github/workflows/feature_freeze.yml vendored
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@ -1,45 +0,0 @@
name: Feature freeze check
on:
pull_request_target:
types:
- opened
branches:
- master
paths:
- 'clippy_lints/src/declared_lints.rs'
jobs:
auto-comment:
runs-on: ubuntu-latest
permissions:
pull-requests: write
# Do not in any case add code that runs anything coming from the content
# of the pull request, as malicious code would be able to access the private
# GitHub token.
steps:
- name: Add freeze warning comment
env:
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
GITHUB_REPOSITORY: ${{ github.repository }}
PR_NUMBER: ${{ github.event.pull_request.number }}
run: |
COMMENT=$(echo "**Seems that you are trying to add a new lint!**\n\
\n\
We are currently in a [feature freeze](https://doc.rust-lang.org/nightly/clippy/development/feature_freeze.html), so we are delaying all lint-adding PRs to September 18 and [focusing on bugfixes](https://github.com/rust-lang/rust-clippy/issues/15086).\n\
\n\
Thanks a lot for your contribution, and sorry for the inconvenience.\n\
\n\
With ❤ from the Clippy team.\n\
\n\
@rustbot note Feature-freeze\n\
@rustbot blocked\n\
@rustbot label +A-lint"
)
curl -s -H "Authorization: Bearer $GITHUB_TOKEN" \
-H "Content-Type: application/vnd.github.raw+json" \
-X POST \
--data "{\"body\":\"${COMMENT}\"}" \
"https://api.github.com/repos/${GITHUB_REPOSITORY}/issues/${PR_NUMBER}/comments"

3
.gitignore vendored
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@ -48,3 +48,6 @@ helper.txt
# mdbook generated output
/book/book
# Remove jujutsu directory from search tools
.jj

148
CHANGELOG.md
View file

@ -6,7 +6,152 @@ document.
## Unreleased / Beta / In Rust Nightly
[4ef75291...master](https://github.com/rust-lang/rust-clippy/compare/4ef75291...master)
[e9b7045...master](https://github.com/rust-lang/rust-clippy/compare/e9b7045...master)
## Rust 1.90
Current stable, released 2025-09-18
[View all 118 merged pull requests](https://github.com/rust-lang/rust-clippy/pulls?q=merged%3A2025-06-13T15%3A55%3A04Z..2025-07-25T13%3A24%3A00Z+base%3Amaster)
Note: This Clippy release does not introduce many new lints and is focused entirely on bug fixes — see
[#15086](https://github.com/rust-lang/rust-clippy/issues/15086) for more details.
## New Lints
* Added [`manual_is_multiple_of`] to `complexity` [#14292](https://github.com/rust-lang/rust-clippy/pull/14292)
* Added [`doc_broken_link`] to `pedantic` [#13696](https://github.com/rust-lang/rust-clippy/pull/13696)
### Moves and Deprecations
* Move [`uninlined_format_args`] to `pedantic` (from `style`, now allow-by-default) [#15287](https://github.com/rust-lang/rust-clippy/pull/15287)
### Enhancements
* [`or_fun_call`] now lints `Option::get_or_insert`, `Result::map_or`, `Option/Result::and` methods
[#15071](https://github.com/rust-lang/rust-clippy/pull/15071)
[#15073](https://github.com/rust-lang/rust-clippy/pull/15073)
[#15074](https://github.com/rust-lang/rust-clippy/pull/15074)
* [`incompatible_msrv`] now recognizes types exceeding MSRV
[#15296](https://github.com/rust-lang/rust-clippy/pull/15296)
* [`incompatible_msrv`] now checks the right MSRV when in a `const` context
[#15297](https://github.com/rust-lang/rust-clippy/pull/15297)
* [`zero_ptr`] now lints in `const` context as well
[#15152](https://github.com/rust-lang/rust-clippy/pull/15152)
* [`map_identity`],[`flat_map_identity`] now recognizes `|[x, y]| [x, y]` as an identity function
[#15229](https://github.com/rust-lang/rust-clippy/pull/15229)
* [`exit`] no longer fails on the main function when using `--test` or `--all-targets` flag
[#15222](https://github.com/rust-lang/rust-clippy/pull/15222)
### False Positive Fixes
* [`if_then_some_else_none`] fixed FP when require type coercion
[#15267](https://github.com/rust-lang/rust-clippy/pull/15267)
* [`module_name_repetitions`] fixed FP on exported macros
[#15319](https://github.com/rust-lang/rust-clippy/pull/15319)
* [`unused_async`] fixed FP on function with `todo!`
[#15308](https://github.com/rust-lang/rust-clippy/pull/15308)
* [`useless_attribute`] fixed FP when using `#[expect(redundant_imports)]` and similar lint attributes
on `use` statements
[#15318](https://github.com/rust-lang/rust-clippy/pull/15318)
* [`pattern_type_mismatch`] fixed FP in external macro
[#15306](https://github.com/rust-lang/rust-clippy/pull/15306)
* [`large_enum_variant`] fixed FP by not suggesting `Box` in `no_std` mode
[#15241](https://github.com/rust-lang/rust-clippy/pull/15241)
* [`missing_inline_in_public_items`] fixed FP on functions with `extern`
[#15313](https://github.com/rust-lang/rust-clippy/pull/15313)
* [`needless_range_loop`] fixed FP on array literals
[#15314](https://github.com/rust-lang/rust-clippy/pull/15314)
* [`ptr_as_ptr`] fixed wrong suggestions with turbo fish
[#15289](https://github.com/rust-lang/rust-clippy/pull/15289)
* [`range_plus_one`], [`range_minus_one`] fixed FP by restricting lint to cases where it is safe
to switch the range type
[#14432](https://github.com/rust-lang/rust-clippy/pull/14432)
* [`ptr_arg`] fixed FP with underscore binding to `&T` or `&mut T` argument
[#15105](https://github.com/rust-lang/rust-clippy/pull/15105)
* [`unsafe_derive_deserialize`] fixed FP caused by the standard library's `pin!()` macro
[#15137](https://github.com/rust-lang/rust-clippy/pull/15137)
* [`unused_trait_names`] fixed FP in macros
[#14947](https://github.com/rust-lang/rust-clippy/pull/14947)
* [`expect_fun_call`] fixed invalid suggestions
[#15122](https://github.com/rust-lang/rust-clippy/pull/15122)
* [`manual_is_multiple_of`] fixed various false positives
[#15205](https://github.com/rust-lang/rust-clippy/pull/15205)
* [`manual_assert`] fixed wrong suggestions for macros
[#15264](https://github.com/rust-lang/rust-clippy/pull/15264)
* [`expect_used`] fixed false negative when meeting `Option::ok().expect`
[#15253](https://github.com/rust-lang/rust-clippy/pull/15253)
* [`manual_abs_diff`] fixed wrong suggestions behind refs
[#15265](https://github.com/rust-lang/rust-clippy/pull/15265)
* [`approx_constant`] fixed FP with overly precise literals and non trivially formatted numerals
[#15236](https://github.com/rust-lang/rust-clippy/pull/15236)
* [`arithmetic_side_effects`] fixed FP on `NonZeroU*.get() - 1`
[#15238](https://github.com/rust-lang/rust-clippy/pull/15238)
* [`legacy_numeric_constants`] fixed suggestion when call is inside parentheses
[#15191](https://github.com/rust-lang/rust-clippy/pull/15191)
* [`manual_is_variant_and`] fixed inverted suggestions that could lead to code with different semantics
[#15206](https://github.com/rust-lang/rust-clippy/pull/15206)
* [`unnecessary_map_or`] fixed FP by not proposing to replace `map_or` call when types wouldn't be correct
[#15181](https://github.com/rust-lang/rust-clippy/pull/15181)
* [`return_and_then`] fixed FP in case of a partially used expression
[#15115](https://github.com/rust-lang/rust-clippy/pull/15115)
* [`manual_let_else`] fixed FP with binding subpattern with unused name
[#15118](https://github.com/rust-lang/rust-clippy/pull/15118)
* [`suboptimal_flops`] fixed FP with ambiguous float types in mul_add suggestions
[#15133](https://github.com/rust-lang/rust-clippy/pull/15133)
* [`borrow_as_ptr`] fixed FP by not removing cast to trait object pointer
[#15145](https://github.com/rust-lang/rust-clippy/pull/15145)
* [`unnecessary_operation`] fixed FP by not removing casts if they are useful to type the expression
[#15182](https://github.com/rust-lang/rust-clippy/pull/15182)
* [`empty_loop`] fixed FP on intrinsic function declaration
[#15201](https://github.com/rust-lang/rust-clippy/pull/15201)
* [`doc_nested_refdefs`] fixed FP where task lists are reported as refdefs
[#15146](https://github.com/rust-lang/rust-clippy/pull/15146)
* [`std_instead_of_core`] fixed FP when not all items come from the new crate
[#15165](https://github.com/rust-lang/rust-clippy/pull/15165)
* [`swap_with_temporary`] fixed FP leading to different semantics being suggested
[#15172](https://github.com/rust-lang/rust-clippy/pull/15172)
* [`cast_possible_truncation`] fixed FP by not giving suggestions inside const context
[#15164](https://github.com/rust-lang/rust-clippy/pull/15164)
* [`missing_panics_doc`] fixed FP by allowing unwrap() and expect()s in const-only contexts
[#15170](https://github.com/rust-lang/rust-clippy/pull/15170)
* [`disallowed_script_idents`] fixed FP on identifiers with `_`
[#15123](https://github.com/rust-lang/rust-clippy/pull/15123)
* [`wildcard_enum_match_arm`] fixed wrong suggestions with raw identifiers
[#15093](https://github.com/rust-lang/rust-clippy/pull/15093)
* [`borrow_deref_ref`] fixed FP by not proposing replacing a reborrow when the reborrow is itself mutably borrowed
[#14967](https://github.com/rust-lang/rust-clippy/pull/14967)
* [`manual_ok_err`] fixed wrong suggestions with references
[#15053](https://github.com/rust-lang/rust-clippy/pull/15053)
* [`identity_op`] fixed FP when encountering `Default::default()`
[#15028](https://github.com/rust-lang/rust-clippy/pull/15028)
* [`exhaustive_structs`] fixed FP on structs with default valued field
[#15022](https://github.com/rust-lang/rust-clippy/pull/15022)
* [`collapsible_else_if`] fixed FP on conditionally compiled stmt
[#14906](https://github.com/rust-lang/rust-clippy/pull/14906)
* [`missing_const_for_fn`] fixed FP by checking MSRV before emitting lint on function containing
non-`Sized` trait bounds
[#15080](https://github.com/rust-lang/rust-clippy/pull/15080)
* [`question_mark`] fixed FP when else branch of let-else contains `#[cfg]`
[#15082](https://github.com/rust-lang/rust-clippy/pull/15082)
### ICE Fixes
* [`single_match`] fixed ICE with deref patterns and string literals
[#15124](https://github.com/rust-lang/rust-clippy/pull/15124)
* [`needless_doctest_main`] fixed panic when doctest is invalid
[#15052](https://github.com/rust-lang/rust-clippy/pull/15052)
* [`zero_sized_map_values`] do not attempt to compute size of a type with escaping lifetimes
[#15434](https://github.com/rust-lang/rust-clippy/pull/15434)
### Documentation Improvements
* [`manual_is_variant_and`] improved documentation to include equality comparison patterns
[#15239](https://github.com/rust-lang/rust-clippy/pull/15239)
* [`uninlined_format_args`] improved documentation with example of how to fix a `{:?}` parameter
[#15228](https://github.com/rust-lang/rust-clippy/pull/15228)
* [`undocumented_unsafe_blocks`] improved documentation wording
[#15213](https://github.com/rust-lang/rust-clippy/pull/15213)
## Rust 1.89
@ -6408,6 +6553,7 @@ Released 2018-09-13
[`redundant_feature_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_feature_names
[`redundant_field_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[`redundant_guards`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_guards
[`redundant_iter_cloned`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_iter_cloned
[`redundant_locals`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_locals
[`redundant_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern
[`redundant_pattern_matching`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching

2
Cargo.toml
View file

@ -1,6 +1,6 @@
[package]
name = "clippy"
version = "0.1.91"
version = "0.1.92"
description = "A bunch of helpful lints to avoid common pitfalls in Rust"
repository = "https://github.com/rust-lang/rust-clippy"
readme = "README.md"

4
book/src/README.md
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@ -1,9 +1,5 @@
# Clippy
[### IMPORTANT NOTE FOR CONTRIBUTORS ================](development/feature_freeze.md)
----
[![License: MIT OR Apache-2.0](https://img.shields.io/crates/l/clippy.svg)](https://github.com/rust-lang/rust-clippy#license)
A collection of lints to catch common mistakes and improve your

1
book/src/SUMMARY.md
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@ -13,7 +13,6 @@
- [GitLab CI](continuous_integration/gitlab.md)
- [Travis CI](continuous_integration/travis.md)
- [Development](development/README.md)
- [IMPORTANT: FEATURE FREEZE](development/feature_freeze.md)
- [Basics](development/basics.md)
- [Adding Lints](development/adding_lints.md)
- [Defining Lints](development/defining_lints.md)

3
book/src/development/adding_lints.md
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@ -1,8 +1,5 @@
# Adding a new lint
[### IMPORTANT NOTE FOR CONTRIBUTORS ================](feature_freeze.md)
You are probably here because you want to add a new lint to Clippy. If this is
the first time you're contributing to Clippy, this document guides you through
creating an example lint from scratch.

55
book/src/development/feature_freeze.md
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@ -1,55 +0,0 @@
# IMPORTANT: FEATURE FREEZE
This is a temporary notice.
From the 26th of June until the 18th of September we will perform a feature freeze. Only bugfix PRs will be reviewed
except already open ones. Every feature-adding PR opened in between those dates will be moved into a
milestone to be reviewed separately at another time.
We do this because of the long backlog of bugs that need to be addressed
in order to continue being the state-of-the-art linter that Clippy has become known for being.
## For contributors
If you are a contributor or are planning to become one, **please do not open a lint-adding PR**, we have lots of open
bugs of all levels of difficulty that you can address instead!
We currently have about 800 lints, each one posing a maintainability challenge that needs to account to every possible
use case of the whole ecosystem. Bugs are natural in every software, but the Clippy team considers that Clippy needs a
refinement period.
If you open a PR at this time, we will not review it but push it into a milestone until the refinement period ends,
adding additional load into our reviewing schedules.
## I want to help, what can I do
Thanks a lot to everyone who wants to help Clippy become better software in this feature freeze period!
If you'd like to help, making a bugfix, making sure that it works, and opening a PR is a great step!
To find things to fix, go to the [tracking issue][tracking_issue], find an issue that you like, go there and claim that
issue with `@rustbot claim`.
As a general metric and always taking into account your skill and knowledge level, you can use this guide:
- 🟥 [ICEs][search_ice], these are compiler errors that causes Clippy to panic and crash. Usually involves high-level
debugging, sometimes interacting directly with the upstream compiler. Difficult to fix but a great challenge that
improves a lot developer workflows!
- 🟧 [Suggestion causes bug][sugg_causes_bug], Clippy suggested code that changed logic in some silent way.
Unacceptable, as this may have disastrous consequences. Easier to fix than ICEs
- 🟨 [Suggestion causes error][sugg_causes_error], Clippy suggested code snippet that caused a compiler error
when applied. We need to make sure that Clippy doesn't suggest using a variable twice at the same time or similar
easy-to-happen occurrences.
- 🟩 [False positives][false_positive], a lint should not have fired, the easiest of them all, as this is "just"
identifying the root of a false positive and making an exception for those cases.
Note that false negatives do not have priority unless the case is very clear, as they are a feature-request in a
trench coat.
[search_ice]: https://github.com/rust-lang/rust-clippy/issues?q=sort%3Aupdated-desc+state%3Aopen+label%3A%22I-ICE%22
[sugg_causes_bug]: https://github.com/rust-lang/rust-clippy/issues?q=sort%3Aupdated-desc%20state%3Aopen%20label%3AI-suggestion-causes-bug
[sugg_causes_error]: https://github.com/rust-lang/rust-clippy/issues?q=sort%3Aupdated-desc%20state%3Aopen%20label%3AI-suggestion-causes-error%20
[false_positive]: https://github.com/rust-lang/rust-clippy/issues?q=sort%3Aupdated-desc%20state%3Aopen%20label%3AI-false-positive
[tracking_issue]: https://github.com/rust-lang/rust-clippy/issues/15086

2
clippy_config/Cargo.toml
View file

@ -1,6 +1,6 @@
[package]
name = "clippy_config"
version = "0.1.91"
version = "0.1.92"
edition = "2024"
publish = false

2
clippy_lints/Cargo.toml
View file

@ -1,6 +1,6 @@
[package]
name = "clippy_lints"
version = "0.1.91"
version = "0.1.92"
description = "A bunch of helpful lints to avoid common pitfalls in Rust"
repository = "https://github.com/rust-lang/rust-clippy"
readme = "README.md"

1
clippy_lints/src/attrs/useless_attribute.rs
View file

@ -30,6 +30,7 @@ pub(super) fn check(cx: &EarlyContext<'_>, item: &Item, attrs: &[Attribute]) {
sym::ambiguous_glob_reexports
| sym::dead_code
| sym::deprecated
| sym::deprecated_in_future
| sym::hidden_glob_reexports
| sym::unreachable_pub
| sym::unused

8
clippy_lints/src/casts/as_underscore.rs
View file

@ -2,7 +2,7 @@ use clippy_utils::diagnostics::span_lint_and_then;
use rustc_errors::Applicability;
use rustc_hir::{Expr, Ty, TyKind};
use rustc_lint::LateContext;
use rustc_middle::ty;
use rustc_middle::ty::IsSuggestable;
use super::AS_UNDERSCORE;
@ -10,15 +10,15 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, ty: &'tc
if matches!(ty.kind, TyKind::Infer(())) {
span_lint_and_then(cx, AS_UNDERSCORE, expr.span, "using `as _` conversion", |diag| {
let ty_resolved = cx.typeck_results().expr_ty(expr);
if let ty::Error(_) = ty_resolved.kind() {
diag.help("consider giving the type explicitly");
} else {
if ty_resolved.is_suggestable(cx.tcx, true) {
diag.span_suggestion(
ty.span,
"consider giving the type explicitly",
ty_resolved,
Applicability::MachineApplicable,
);
} else {
diag.help("consider giving the type explicitly");
}
});
}

30
clippy_lints/src/casts/cast_possible_wrap.rs
View file

@ -1,4 +1,7 @@
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::msrvs::{self, Msrv};
use clippy_utils::sugg::Sugg;
use rustc_errors::Applicability;
use rustc_hir::Expr;
use rustc_lint::LateContext;
use rustc_middle::ty::Ty;
@ -16,7 +19,14 @@ enum EmitState {
LintOnPtrSize(u64),
}
pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_from: Ty<'_>, cast_to: Ty<'_>) {
pub(super) fn check(
cx: &LateContext<'_>,
expr: &Expr<'_>,
cast_op: &Expr<'_>,
cast_from: Ty<'_>,
cast_to: Ty<'_>,
msrv: Msrv,
) {
let (Some(from_nbits), Some(to_nbits)) = (
utils::int_ty_to_nbits(cx.tcx, cast_from),
utils::int_ty_to_nbits(cx.tcx, cast_to),
@ -85,5 +95,23 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_from: Ty<'_>, ca
.note("`usize` and `isize` may be as small as 16 bits on some platforms")
.note("for more information see https://doc.rust-lang.org/reference/types/numeric.html#machine-dependent-integer-types");
}
if msrv.meets(cx, msrvs::INTEGER_SIGN_CAST)
&& let Some(cast) = utils::is_signedness_cast(cast_from, cast_to)
{
let method = match cast {
utils::CastTo::Signed => "cast_signed()",
utils::CastTo::Unsigned => "cast_unsigned()",
};
let mut app = Applicability::MaybeIncorrect;
let sugg = Sugg::hir_with_context(cx, cast_op, expr.span.ctxt(), "..", &mut app);
diag.span_suggestion(
expr.span,
format!("if this is intentional, use `{method}` instead"),
format!("{}.{method}", sugg.maybe_paren()),
app,
);
}
});
}

29
clippy_lints/src/casts/cast_sign_loss.rs
View file

@ -2,15 +2,18 @@ use std::convert::Infallible;
use std::ops::ControlFlow;
use clippy_utils::consts::{ConstEvalCtxt, Constant};
use clippy_utils::diagnostics::span_lint;
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::msrvs::{self, Msrv};
use clippy_utils::sugg::Sugg;
use clippy_utils::visitors::{Descend, for_each_expr_without_closures};
use clippy_utils::{method_chain_args, sext, sym};
use rustc_errors::Applicability;
use rustc_hir::{BinOpKind, Expr, ExprKind};
use rustc_lint::LateContext;
use rustc_middle::ty::{self, Ty};
use rustc_span::Symbol;
use super::CAST_SIGN_LOSS;
use super::{CAST_SIGN_LOSS, utils};
/// A list of methods that can never return a negative value.
/// Includes methods that panic rather than returning a negative value.
@ -42,13 +45,33 @@ pub(super) fn check<'cx>(
cast_op: &Expr<'_>,
cast_from: Ty<'cx>,
cast_to: Ty<'_>,
msrv: Msrv,
) {
if should_lint(cx, cast_op, cast_from, cast_to) {
span_lint(
span_lint_and_then(
cx,
CAST_SIGN_LOSS,
expr.span,
format!("casting `{cast_from}` to `{cast_to}` may lose the sign of the value"),
|diag| {
if msrv.meets(cx, msrvs::INTEGER_SIGN_CAST)
&& let Some(cast) = utils::is_signedness_cast(cast_from, cast_to)
{
let method = match cast {
utils::CastTo::Signed => "cast_signed()",
utils::CastTo::Unsigned => "cast_unsigned()",
};
let mut app = Applicability::MaybeIncorrect;
let sugg = Sugg::hir_with_context(cx, cast_op, expr.span.ctxt(), "..", &mut app);
diag.span_suggestion(
expr.span,
format!("if this is intentional, use `{method}` instead"),
format!("{}.{method}", sugg.maybe_paren()),
app,
);
}
},
);
}
}

4
clippy_lints/src/casts/mod.rs
View file

@ -890,9 +890,9 @@ impl<'tcx> LateLintPass<'tcx> for Casts {
if cast_to.is_numeric() {
cast_possible_truncation::check(cx, expr, cast_from_expr, cast_from, cast_to, cast_to_hir.span);
if cast_from.is_numeric() {
cast_possible_wrap::check(cx, expr, cast_from, cast_to);
cast_possible_wrap::check(cx, expr, cast_from_expr, cast_from, cast_to, self.msrv);
cast_precision_loss::check(cx, expr, cast_from, cast_to);
cast_sign_loss::check(cx, expr, cast_from_expr, cast_from, cast_to);
cast_sign_loss::check(cx, expr, cast_from_expr, cast_from, cast_to, self.msrv);
cast_abs_to_unsigned::check(cx, expr, cast_from_expr, cast_from, cast_to, self.msrv);
cast_nan_to_int::check(cx, expr, cast_from_expr, cast_from, cast_to);
}

15
clippy_lints/src/casts/utils.rs
View file

@ -60,3 +60,18 @@ pub(super) fn enum_ty_to_nbits(adt: AdtDef<'_>, tcx: TyCtxt<'_>) -> u64 {
neg_bits.max(pos_bits).into()
}
}
pub(super) enum CastTo {
Signed,
Unsigned,
}
/// Returns `Some` if the type cast is between 2 integral types that differ
/// only in signedness, otherwise `None`. The value of `Some` is which
/// signedness is casted to.
pub(super) fn is_signedness_cast(cast_from: Ty<'_>, cast_to: Ty<'_>) -> Option<CastTo> {
match (cast_from.kind(), cast_to.kind()) {
(ty::Int(from), ty::Uint(to)) if from.to_unsigned() == *to => Some(CastTo::Unsigned),
(ty::Uint(from), ty::Int(to)) if *from == to.to_unsigned() => Some(CastTo::Signed),
_ => None,
}
}

5
clippy_lints/src/declared_lints.rs
View file

@ -448,10 +448,12 @@ pub static LINTS: &[&::declare_clippy_lint::LintInfo] = &[
crate::methods::OR_THEN_UNWRAP_INFO,
crate::methods::PATH_BUF_PUSH_OVERWRITE_INFO,
crate::methods::PATH_ENDS_WITH_EXT_INFO,
crate::methods::PTR_OFFSET_WITH_CAST_INFO,
crate::methods::RANGE_ZIP_WITH_LEN_INFO,
crate::methods::READONLY_WRITE_LOCK_INFO,
crate::methods::READ_LINE_WITHOUT_TRIM_INFO,
crate::methods::REDUNDANT_AS_STR_INFO,
crate::methods::REDUNDANT_ITER_CLONED_INFO,
crate::methods::REPEAT_ONCE_INFO,
crate::methods::RESULT_FILTER_MAP_INFO,
crate::methods::RESULT_MAP_OR_INTO_OPTION_INFO,
@ -503,7 +505,6 @@ pub static LINTS: &[&::declare_clippy_lint::LintInfo] = &[
crate::min_ident_chars::MIN_IDENT_CHARS_INFO,
crate::minmax::MIN_MAX_INFO,
crate::misc::SHORT_CIRCUIT_STATEMENT_INFO,
crate::misc::TOPLEVEL_REF_ARG_INFO,
crate::misc::USED_UNDERSCORE_BINDING_INFO,
crate::misc::USED_UNDERSCORE_ITEMS_INFO,
crate::misc_early::BUILTIN_TYPE_SHADOW_INFO,
@ -625,7 +626,6 @@ pub static LINTS: &[&::declare_clippy_lint::LintInfo] = &[
crate::ptr::MUT_FROM_REF_INFO,
crate::ptr::PTR_ARG_INFO,
crate::ptr::PTR_EQ_INFO,
crate::ptr_offset_with_cast::PTR_OFFSET_WITH_CAST_INFO,
crate::pub_underscore_fields::PUB_UNDERSCORE_FIELDS_INFO,
crate::pub_use::PUB_USE_INFO,
crate::question_mark::QUESTION_MARK_INFO,
@ -706,6 +706,7 @@ pub static LINTS: &[&::declare_clippy_lint::LintInfo] = &[
crate::tests_outside_test_module::TESTS_OUTSIDE_TEST_MODULE_INFO,
crate::to_digit_is_some::TO_DIGIT_IS_SOME_INFO,
crate::to_string_trait_impl::TO_STRING_TRAIT_IMPL_INFO,
crate::toplevel_ref_arg::TOPLEVEL_REF_ARG_INFO,
crate::trailing_empty_array::TRAILING_EMPTY_ARRAY_INFO,
crate::trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS_INFO,
crate::trait_bounds::TYPE_REPETITION_IN_BOUNDS_INFO,

7
clippy_lints/src/dereference.rs
View file

@ -1,10 +1,9 @@
use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_hir_and_then};
use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
use clippy_utils::sugg::has_enclosing_paren;
use clippy_utils::ty::{adjust_derefs_manually_drop, implements_trait, is_manually_drop};
use clippy_utils::ty::{adjust_derefs_manually_drop, implements_trait, is_manually_drop, peel_and_count_ty_refs};
use clippy_utils::{
DefinedTy, ExprUseNode, expr_use_ctxt, get_parent_expr, is_block_like, is_lint_allowed, path_to_local,
peel_middle_ty_refs,
};
use rustc_ast::util::parser::ExprPrecedence;
use rustc_data_structures::fx::FxIndexMap;
@ -942,7 +941,7 @@ fn report<'tcx>(
let (expr_str, expr_is_macro_call) =
snippet_with_context(cx, expr.span, data.first_expr.span.ctxt(), "..", &mut app);
let ty = typeck.expr_ty(expr);
let (_, ref_count) = peel_middle_ty_refs(ty);
let (_, ref_count, _) = peel_and_count_ty_refs(ty);
let deref_str = if ty_changed_count >= ref_count && ref_count != 0 {
// a deref call changing &T -> &U requires two deref operators the first time
// this occurs. One to remove the reference, a second to call the deref impl.
@ -1045,7 +1044,7 @@ fn report<'tcx>(
if let ty::Ref(_, dst, _) = data.adjusted_ty.kind()
&& dst.is_slice()
{
let (src, n_src_refs) = peel_middle_ty_refs(ty);
let (src, n_src_refs, _) = peel_and_count_ty_refs(ty);
if n_src_refs >= 2 && src.is_array() {
return;
}

527
clippy_lints/src/derive.rs
View file

@ -1,527 +0,0 @@
use std::ops::ControlFlow;
use clippy_utils::diagnostics::{span_lint_and_note, span_lint_and_then, span_lint_hir_and_then};
use clippy_utils::ty::{implements_trait, implements_trait_with_env, is_copy};
use clippy_utils::{has_non_exhaustive_attr, is_lint_allowed, paths};
use rustc_errors::Applicability;
use rustc_hir::def_id::DefId;
use rustc_hir::intravisit::{FnKind, Visitor, walk_expr, walk_fn, walk_item};
use rustc_hir::{self as hir, BlockCheckMode, BodyId, Expr, ExprKind, FnDecl, Impl, Item, ItemKind, UnsafeSource};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::hir::nested_filter;
use rustc_middle::ty::{
self, ClauseKind, GenericArgKind, GenericParamDefKind, ParamEnv, TraitPredicate, Ty, TyCtxt, Upcast,
};
use rustc_session::declare_lint_pass;
use rustc_span::def_id::LocalDefId;
use rustc_span::{Span, sym};
declare_clippy_lint! {
/// ### What it does
/// Lints against manual `PartialEq` implementations for types with a derived `Hash`
/// implementation.
///
/// ### Why is this bad?
/// The implementation of these traits must agree (for
/// example for use with `HashMap`) so it’s probably a bad idea to use a
/// default-generated `Hash` implementation with an explicitly defined
/// `PartialEq`. In particular, the following must hold for any type:
///
/// ```text
/// k1 == k2 ⇒ hash(k1) == hash(k2)
/// ```
///
/// ### Example
/// ```ignore
/// #[derive(Hash)]
/// struct Foo;
///
/// impl PartialEq for Foo {
/// ...
/// }
/// ```
#[clippy::version = "pre 1.29.0"]
pub DERIVED_HASH_WITH_MANUAL_EQ,
correctness,
"deriving `Hash` but implementing `PartialEq` explicitly"
}
declare_clippy_lint! {
/// ### What it does
/// Lints against manual `PartialOrd` and `Ord` implementations for types with a derived `Ord`
/// or `PartialOrd` implementation.
///
/// ### Why is this bad?
/// The implementation of these traits must agree (for
/// example for use with `sort`) so it’s probably a bad idea to use a
/// default-generated `Ord` implementation with an explicitly defined
/// `PartialOrd`. In particular, the following must hold for any type
/// implementing `Ord`:
///
/// ```text
/// k1.cmp(&k2) == k1.partial_cmp(&k2).unwrap()
/// ```
///
/// ### Example
/// ```rust,ignore
/// #[derive(Ord, PartialEq, Eq)]
/// struct Foo;
///
/// impl PartialOrd for Foo {
/// ...
/// }
/// ```
/// Use instead:
/// ```rust,ignore
/// #[derive(PartialEq, Eq)]
/// struct Foo;
///
/// impl PartialOrd for Foo {
/// fn partial_cmp(&self, other: &Foo) -> Option<Ordering> {
/// Some(self.cmp(other))
/// }
/// }
///
/// impl Ord for Foo {
/// ...
/// }
/// ```
/// or, if you don't need a custom ordering:
/// ```rust,ignore
/// #[derive(Ord, PartialOrd, PartialEq, Eq)]
/// struct Foo;
/// ```
#[clippy::version = "1.47.0"]
pub DERIVE_ORD_XOR_PARTIAL_ORD,
correctness,
"deriving `Ord` but implementing `PartialOrd` explicitly"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for explicit `Clone` implementations for `Copy`
/// types.
///
/// ### Why is this bad?
/// To avoid surprising behavior, these traits should
/// agree and the behavior of `Copy` cannot be overridden. In almost all
/// situations a `Copy` type should have a `Clone` implementation that does
/// nothing more than copy the object, which is what `#[derive(Copy, Clone)]`
/// gets you.
///
/// ### Example
/// ```rust,ignore
/// #[derive(Copy)]
/// struct Foo;
///
/// impl Clone for Foo {
/// // ..
/// }
/// ```
#[clippy::version = "pre 1.29.0"]
pub EXPL_IMPL_CLONE_ON_COPY,
pedantic,
"implementing `Clone` explicitly on `Copy` types"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for deriving `serde::Deserialize` on a type that
/// has methods using `unsafe`.
///
/// ### Why is this bad?
/// Deriving `serde::Deserialize` will create a constructor
/// that may violate invariants held by another constructor.
///
/// ### Example
/// ```rust,ignore
/// use serde::Deserialize;
///
/// #[derive(Deserialize)]
/// pub struct Foo {
/// // ..
/// }
///
/// impl Foo {
/// pub fn new() -> Self {
/// // setup here ..
/// }
///
/// pub unsafe fn parts() -> (&str, &str) {
/// // assumes invariants hold
/// }
/// }
/// ```
#[clippy::version = "1.45.0"]
pub UNSAFE_DERIVE_DESERIALIZE,
pedantic,
"deriving `serde::Deserialize` on a type that has methods using `unsafe`"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for types that derive `PartialEq` and could implement `Eq`.
///
/// ### Why is this bad?
/// If a type `T` derives `PartialEq` and all of its members implement `Eq`,
/// then `T` can always implement `Eq`. Implementing `Eq` allows `T` to be used
/// in APIs that require `Eq` types. It also allows structs containing `T` to derive
/// `Eq` themselves.
///
/// ### Example
/// ```no_run
/// #[derive(PartialEq)]
/// struct Foo {
/// i_am_eq: i32,
/// i_am_eq_too: Vec<String>,
/// }
/// ```
/// Use instead:
/// ```no_run
/// #[derive(PartialEq, Eq)]
/// struct Foo {
/// i_am_eq: i32,
/// i_am_eq_too: Vec<String>,
/// }
/// ```
#[clippy::version = "1.63.0"]
pub DERIVE_PARTIAL_EQ_WITHOUT_EQ,
nursery,
"deriving `PartialEq` on a type that can implement `Eq`, without implementing `Eq`"
}
declare_lint_pass!(Derive => [
EXPL_IMPL_CLONE_ON_COPY,
DERIVED_HASH_WITH_MANUAL_EQ,
DERIVE_ORD_XOR_PARTIAL_ORD,
UNSAFE_DERIVE_DESERIALIZE,
DERIVE_PARTIAL_EQ_WITHOUT_EQ
]);
impl<'tcx> LateLintPass<'tcx> for Derive {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
if let ItemKind::Impl(Impl {
of_trait: Some(of_trait),
..
}) = item.kind
{
let trait_ref = &of_trait.trait_ref;
let ty = cx.tcx.type_of(item.owner_id).instantiate_identity();
let is_automatically_derived = cx.tcx.is_automatically_derived(item.owner_id.to_def_id());
check_hash_peq(cx, item.span, trait_ref, ty, is_automatically_derived);
check_ord_partial_ord(cx, item.span, trait_ref, ty, is_automatically_derived);
if is_automatically_derived {
check_unsafe_derive_deserialize(cx, item, trait_ref, ty);
check_partial_eq_without_eq(cx, item.span, trait_ref, ty);
} else {
check_copy_clone(cx, item, trait_ref, ty);
}
}
}
}
/// Implementation of the `DERIVED_HASH_WITH_MANUAL_EQ` lint.
fn check_hash_peq<'tcx>(
cx: &LateContext<'tcx>,
span: Span,
trait_ref: &hir::TraitRef<'_>,
ty: Ty<'tcx>,
hash_is_automatically_derived: bool,
) {
if let Some(peq_trait_def_id) = cx.tcx.lang_items().eq_trait()
&& let Some(def_id) = trait_ref.trait_def_id()
&& cx.tcx.is_diagnostic_item(sym::Hash, def_id)
{
// Look for the PartialEq implementations for `ty`
cx.tcx.for_each_relevant_impl(peq_trait_def_id, ty, |impl_id| {
let peq_is_automatically_derived = cx.tcx.is_automatically_derived(impl_id);
if !hash_is_automatically_derived || peq_is_automatically_derived {
return;
}
let trait_ref = cx.tcx.impl_trait_ref(impl_id).expect("must be a trait implementation");
// Only care about `impl PartialEq<Foo> for Foo`
// For `impl PartialEq<B> for A, input_types is [A, B]
if trait_ref.instantiate_identity().args.type_at(1) == ty {
span_lint_and_then(
cx,
DERIVED_HASH_WITH_MANUAL_EQ,
span,
"you are deriving `Hash` but have implemented `PartialEq` explicitly",
|diag| {
if let Some(local_def_id) = impl_id.as_local() {
let hir_id = cx.tcx.local_def_id_to_hir_id(local_def_id);
diag.span_note(cx.tcx.hir_span(hir_id), "`PartialEq` implemented here");
}
},
);
}
});
}
}
/// Implementation of the `DERIVE_ORD_XOR_PARTIAL_ORD` lint.
fn check_ord_partial_ord<'tcx>(
cx: &LateContext<'tcx>,
span: Span,
trait_ref: &hir::TraitRef<'_>,
ty: Ty<'tcx>,
ord_is_automatically_derived: bool,
) {
if let Some(ord_trait_def_id) = cx.tcx.get_diagnostic_item(sym::Ord)
&& let Some(partial_ord_trait_def_id) = cx.tcx.lang_items().partial_ord_trait()
&& let Some(def_id) = &trait_ref.trait_def_id()
&& *def_id == ord_trait_def_id
{
// Look for the PartialOrd implementations for `ty`
cx.tcx.for_each_relevant_impl(partial_ord_trait_def_id, ty, |impl_id| {
let partial_ord_is_automatically_derived = cx.tcx.is_automatically_derived(impl_id);
if partial_ord_is_automatically_derived == ord_is_automatically_derived {
return;
}
let trait_ref = cx.tcx.impl_trait_ref(impl_id).expect("must be a trait implementation");
// Only care about `impl PartialOrd<Foo> for Foo`
// For `impl PartialOrd<B> for A, input_types is [A, B]
if trait_ref.instantiate_identity().args.type_at(1) == ty {
let mess = if partial_ord_is_automatically_derived {
"you are implementing `Ord` explicitly but have derived `PartialOrd`"
} else {
"you are deriving `Ord` but have implemented `PartialOrd` explicitly"
};
span_lint_and_then(cx, DERIVE_ORD_XOR_PARTIAL_ORD, span, mess, |diag| {
if let Some(local_def_id) = impl_id.as_local() {
let hir_id = cx.tcx.local_def_id_to_hir_id(local_def_id);
diag.span_note(cx.tcx.hir_span(hir_id), "`PartialOrd` implemented here");
}
});
}
});
}
}
/// Implementation of the `EXPL_IMPL_CLONE_ON_COPY` lint.
fn check_copy_clone<'tcx>(cx: &LateContext<'tcx>, item: &Item<'_>, trait_ref: &hir::TraitRef<'_>, ty: Ty<'tcx>) {
let clone_id = match cx.tcx.lang_items().clone_trait() {
Some(id) if trait_ref.trait_def_id() == Some(id) => id,
_ => return,
};
let Some(copy_id) = cx.tcx.lang_items().copy_trait() else {
return;
};
let (ty_adt, ty_subs) = match *ty.kind() {
// Unions can't derive clone.
ty::Adt(adt, subs) if !adt.is_union() => (adt, subs),
_ => return,
};
// If the current self type doesn't implement Copy (due to generic constraints), search to see if
// there's a Copy impl for any instance of the adt.
if !is_copy(cx, ty) {
if ty_subs.non_erasable_generics().next().is_some() {
let has_copy_impl = cx.tcx.local_trait_impls(copy_id).iter().any(|&id| {
matches!(cx.tcx.type_of(id).instantiate_identity().kind(), ty::Adt(adt, _)
if ty_adt.did() == adt.did())
});
if !has_copy_impl {
return;
}
} else {
return;
}
}
// Derive constrains all generic types to requiring Clone. Check if any type is not constrained for
// this impl.
if ty_subs.types().any(|ty| !implements_trait(cx, ty, clone_id, &[])) {
return;
}
// `#[repr(packed)]` structs with type/const parameters can't derive `Clone`.
// https://github.com/rust-lang/rust-clippy/issues/10188
if ty_adt.repr().packed()
&& ty_subs
.iter()
.any(|arg| matches!(arg.kind(), GenericArgKind::Type(_) | GenericArgKind::Const(_)))
{
return;
}
// The presence of `unsafe` fields prevents deriving `Clone` automatically
if ty_adt.all_fields().any(|f| f.safety.is_unsafe()) {
return;
}
span_lint_and_note(
cx,
EXPL_IMPL_CLONE_ON_COPY,
item.span,
"you are implementing `Clone` explicitly on a `Copy` type",
Some(item.span),
"consider deriving `Clone` or removing `Copy`",
);
}
/// Implementation of the `UNSAFE_DERIVE_DESERIALIZE` lint.
fn check_unsafe_derive_deserialize<'tcx>(
cx: &LateContext<'tcx>,
item: &Item<'_>,
trait_ref: &hir::TraitRef<'_>,
ty: Ty<'tcx>,
) {
fn has_unsafe<'tcx>(cx: &LateContext<'tcx>, item: &'tcx Item<'_>) -> bool {
let mut visitor = UnsafeVisitor { cx };
walk_item(&mut visitor, item).is_break()
}
if let Some(trait_def_id) = trait_ref.trait_def_id()
&& paths::SERDE_DESERIALIZE.matches(cx, trait_def_id)
&& let ty::Adt(def, _) = ty.kind()
&& let Some(local_def_id) = def.did().as_local()
&& let adt_hir_id = cx.tcx.local_def_id_to_hir_id(local_def_id)
&& !is_lint_allowed(cx, UNSAFE_DERIVE_DESERIALIZE, adt_hir_id)
&& cx
.tcx
.inherent_impls(def.did())
.iter()
.map(|imp_did| cx.tcx.hir_expect_item(imp_did.expect_local()))
.any(|imp| has_unsafe(cx, imp))
{
span_lint_hir_and_then(
cx,
UNSAFE_DERIVE_DESERIALIZE,
adt_hir_id,
item.span,
"you are deriving `serde::Deserialize` on a type that has methods using `unsafe`",
|diag| {
diag.help(
"consider implementing `serde::Deserialize` manually. See https://serde.rs/impl-deserialize.html",
);
},
);
}
}
struct UnsafeVisitor<'a, 'tcx> {
cx: &'a LateContext<'tcx>,
}
impl<'tcx> Visitor<'tcx> for UnsafeVisitor<'_, 'tcx> {
type Result = ControlFlow<()>;
type NestedFilter = nested_filter::All;
fn visit_fn(
&mut self,
kind: FnKind<'tcx>,
decl: &'tcx FnDecl<'_>,
body_id: BodyId,
_: Span,
id: LocalDefId,
) -> Self::Result {
if let Some(header) = kind.header()
&& header.is_unsafe()
{
ControlFlow::Break(())
} else {
walk_fn(self, kind, decl, body_id, id)
}
}
fn visit_expr(&mut self, expr: &'tcx Expr<'_>) -> Self::Result {
if let ExprKind::Block(block, _) = expr.kind
&& block.rules == BlockCheckMode::UnsafeBlock(UnsafeSource::UserProvided)
&& block
.span
.source_callee()
.and_then(|expr| expr.macro_def_id)
.is_none_or(|did| !self.cx.tcx.is_diagnostic_item(sym::pin_macro, did))
{
return ControlFlow::Break(());
}
walk_expr(self, expr)
}
fn maybe_tcx(&mut self) -> Self::MaybeTyCtxt {
self.cx.tcx
}
}
/// Implementation of the `DERIVE_PARTIAL_EQ_WITHOUT_EQ` lint.
fn check_partial_eq_without_eq<'tcx>(cx: &LateContext<'tcx>, span: Span, trait_ref: &hir::TraitRef<'_>, ty: Ty<'tcx>) {
if let ty::Adt(adt, args) = ty.kind()
&& cx.tcx.visibility(adt.did()).is_public()
&& let Some(eq_trait_def_id) = cx.tcx.get_diagnostic_item(sym::Eq)
&& let Some(def_id) = trait_ref.trait_def_id()
&& cx.tcx.is_diagnostic_item(sym::PartialEq, def_id)
&& !has_non_exhaustive_attr(cx.tcx, *adt)
&& !ty_implements_eq_trait(cx.tcx, ty, eq_trait_def_id)
&& let typing_env = typing_env_for_derived_eq(cx.tcx, adt.did(), eq_trait_def_id)
&& let Some(local_def_id) = adt.did().as_local()
// If all of our fields implement `Eq`, we can implement `Eq` too
&& adt
.all_fields()
.map(|f| f.ty(cx.tcx, args))
.all(|ty| implements_trait_with_env(cx.tcx, typing_env, ty, eq_trait_def_id, None, &[]))
{
span_lint_hir_and_then(
cx,
DERIVE_PARTIAL_EQ_WITHOUT_EQ,
cx.tcx.local_def_id_to_hir_id(local_def_id),
span.ctxt().outer_expn_data().call_site,
"you are deriving `PartialEq` and can implement `Eq`",
|diag| {
diag.span_suggestion(
span.ctxt().outer_expn_data().call_site,
"consider deriving `Eq` as well",
"PartialEq, Eq",
Applicability::MachineApplicable,
);
},
);
}
}
fn ty_implements_eq_trait<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, eq_trait_id: DefId) -> bool {
tcx.non_blanket_impls_for_ty(eq_trait_id, ty).next().is_some()
}
/// Creates the `ParamEnv` used for the given type's derived `Eq` impl.
fn typing_env_for_derived_eq(tcx: TyCtxt<'_>, did: DefId, eq_trait_id: DefId) -> ty::TypingEnv<'_> {
// Initial map from generic index to param def.
// Vec<(param_def, needs_eq)>
let mut params = tcx
.generics_of(did)
.own_params
.iter()
.map(|p| (p, matches!(p.kind, GenericParamDefKind::Type { .. })))
.collect::<Vec<_>>();
let ty_predicates = tcx.predicates_of(did).predicates;
for (p, _) in ty_predicates {
if let ClauseKind::Trait(p) = p.kind().skip_binder()
&& p.trait_ref.def_id == eq_trait_id
&& let ty::Param(self_ty) = p.trait_ref.self_ty().kind()
{
// Flag types which already have an `Eq` bound.
params[self_ty.index as usize].1 = false;
}
}
let param_env = ParamEnv::new(tcx.mk_clauses_from_iter(ty_predicates.iter().map(|&(p, _)| p).chain(
params.iter().filter(|&&(_, needs_eq)| needs_eq).map(|&(param, _)| {
ClauseKind::Trait(TraitPredicate {
trait_ref: ty::TraitRef::new(tcx, eq_trait_id, [tcx.mk_param_from_def(param)]),
polarity: ty::PredicatePolarity::Positive,
})
.upcast(tcx)
}),
)));
ty::TypingEnv {
typing_mode: ty::TypingMode::non_body_analysis(),
param_env,
}
}

50
clippy_lints/src/derive/derive_ord_xor_partial_ord.rs Normal file
View file

@ -0,0 +1,50 @@
use clippy_utils::diagnostics::span_lint_and_then;
use rustc_hir as hir;
use rustc_lint::LateContext;
use rustc_middle::ty::Ty;
use rustc_span::{Span, sym};
use super::DERIVE_ORD_XOR_PARTIAL_ORD;
/// Implementation of the `DERIVE_ORD_XOR_PARTIAL_ORD` lint.
pub(super) fn check<'tcx>(
cx: &LateContext<'tcx>,
span: Span,
trait_ref: &hir::TraitRef<'_>,
ty: Ty<'tcx>,
ord_is_automatically_derived: bool,
) {
if let Some(ord_trait_def_id) = cx.tcx.get_diagnostic_item(sym::Ord)
&& let Some(partial_ord_trait_def_id) = cx.tcx.lang_items().partial_ord_trait()
&& let Some(def_id) = &trait_ref.trait_def_id()
&& *def_id == ord_trait_def_id
{
// Look for the PartialOrd implementations for `ty`
cx.tcx.for_each_relevant_impl(partial_ord_trait_def_id, ty, |impl_id| {
let partial_ord_is_automatically_derived = cx.tcx.is_automatically_derived(impl_id);
if partial_ord_is_automatically_derived == ord_is_automatically_derived {
return;
}
let trait_ref = cx.tcx.impl_trait_ref(impl_id).expect("must be a trait implementation");
// Only care about `impl PartialOrd<Foo> for Foo`
// For `impl PartialOrd<B> for A, input_types is [A, B]
if trait_ref.instantiate_identity().args.type_at(1) == ty {
let mess = if partial_ord_is_automatically_derived {
"you are implementing `Ord` explicitly but have derived `PartialOrd`"
} else {
"you are deriving `Ord` but have implemented `PartialOrd` explicitly"
};
span_lint_and_then(cx, DERIVE_ORD_XOR_PARTIAL_ORD, span, mess, |diag| {
if let Some(local_def_id) = impl_id.as_local() {
let hir_id = cx.tcx.local_def_id_to_hir_id(local_def_id);
diag.span_note(cx.tcx.hir_span(hir_id), "`PartialOrd` implemented here");
}
});
}
});
}
}

87
clippy_lints/src/derive/derive_partial_eq_without_eq.rs Normal file
View file

@ -0,0 +1,87 @@
use clippy_utils::diagnostics::span_lint_hir_and_then;
use clippy_utils::has_non_exhaustive_attr;
use clippy_utils::ty::implements_trait_with_env;
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
use rustc_lint::LateContext;
use rustc_middle::ty::{self, ClauseKind, GenericParamDefKind, ParamEnv, TraitPredicate, Ty, TyCtxt, Upcast};
use rustc_span::{Span, sym};
use super::DERIVE_PARTIAL_EQ_WITHOUT_EQ;
/// Implementation of the `DERIVE_PARTIAL_EQ_WITHOUT_EQ` lint.
pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, span: Span, trait_ref: &hir::TraitRef<'_>, ty: Ty<'tcx>) {
if let ty::Adt(adt, args) = ty.kind()
&& cx.tcx.visibility(adt.did()).is_public()
&& let Some(eq_trait_def_id) = cx.tcx.get_diagnostic_item(sym::Eq)
&& let Some(def_id) = trait_ref.trait_def_id()
&& cx.tcx.is_diagnostic_item(sym::PartialEq, def_id)
&& !has_non_exhaustive_attr(cx.tcx, *adt)
&& !ty_implements_eq_trait(cx.tcx, ty, eq_trait_def_id)
&& let typing_env = typing_env_for_derived_eq(cx.tcx, adt.did(), eq_trait_def_id)
&& let Some(local_def_id) = adt.did().as_local()
// If all of our fields implement `Eq`, we can implement `Eq` too
&& adt
.all_fields()
.map(|f| f.ty(cx.tcx, args))
.all(|ty| implements_trait_with_env(cx.tcx, typing_env, ty, eq_trait_def_id, None, &[]))
{
span_lint_hir_and_then(
cx,
DERIVE_PARTIAL_EQ_WITHOUT_EQ,
cx.tcx.local_def_id_to_hir_id(local_def_id),
span.ctxt().outer_expn_data().call_site,
"you are deriving `PartialEq` and can implement `Eq`",
|diag| {
diag.span_suggestion(
span.ctxt().outer_expn_data().call_site,
"consider deriving `Eq` as well",
"PartialEq, Eq",
Applicability::MachineApplicable,
);
},
);
}
}
fn ty_implements_eq_trait<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>, eq_trait_id: DefId) -> bool {
tcx.non_blanket_impls_for_ty(eq_trait_id, ty).next().is_some()
}
/// Creates the `ParamEnv` used for the given type's derived `Eq` impl.
fn typing_env_for_derived_eq(tcx: TyCtxt<'_>, did: DefId, eq_trait_id: DefId) -> ty::TypingEnv<'_> {
// Initial map from generic index to param def.
// Vec<(param_def, needs_eq)>
let mut params = tcx
.generics_of(did)
.own_params
.iter()
.map(|p| (p, matches!(p.kind, GenericParamDefKind::Type { .. })))
.collect::<Vec<_>>();
let ty_predicates = tcx.predicates_of(did).predicates;
for (p, _) in ty_predicates {
if let ClauseKind::Trait(p) = p.kind().skip_binder()
&& p.trait_ref.def_id == eq_trait_id
&& let ty::Param(self_ty) = p.trait_ref.self_ty().kind()
{
// Flag types which already have an `Eq` bound.
params[self_ty.index as usize].1 = false;
}
}
let param_env = ParamEnv::new(tcx.mk_clauses_from_iter(ty_predicates.iter().map(|&(p, _)| p).chain(
params.iter().filter(|&&(_, needs_eq)| needs_eq).map(|&(param, _)| {
ClauseKind::Trait(TraitPredicate {
trait_ref: ty::TraitRef::new(tcx, eq_trait_id, [tcx.mk_param_from_def(param)]),
polarity: ty::PredicatePolarity::Positive,
})
.upcast(tcx)
}),
)));
ty::TypingEnv {
typing_mode: ty::TypingMode::non_body_analysis(),
param_env,
}
}

49
clippy_lints/src/derive/derived_hash_with_manual_eq.rs Normal file
View file

@ -0,0 +1,49 @@
use clippy_utils::diagnostics::span_lint_and_then;
use rustc_hir as hir;
use rustc_lint::LateContext;
use rustc_middle::ty::Ty;
use rustc_span::{Span, sym};
use super::DERIVED_HASH_WITH_MANUAL_EQ;
/// Implementation of the `DERIVED_HASH_WITH_MANUAL_EQ` lint.
pub(super) fn check<'tcx>(
cx: &LateContext<'tcx>,
span: Span,
trait_ref: &hir::TraitRef<'_>,
ty: Ty<'tcx>,
hash_is_automatically_derived: bool,
) {
if let Some(peq_trait_def_id) = cx.tcx.lang_items().eq_trait()
&& let Some(def_id) = trait_ref.trait_def_id()
&& cx.tcx.is_diagnostic_item(sym::Hash, def_id)
{
// Look for the PartialEq implementations for `ty`
cx.tcx.for_each_relevant_impl(peq_trait_def_id, ty, |impl_id| {
let peq_is_automatically_derived = cx.tcx.is_automatically_derived(impl_id);
if !hash_is_automatically_derived || peq_is_automatically_derived {
return;
}
let trait_ref = cx.tcx.impl_trait_ref(impl_id).expect("must be a trait implementation");
// Only care about `impl PartialEq<Foo> for Foo`
// For `impl PartialEq<B> for A, input_types is [A, B]
if trait_ref.instantiate_identity().args.type_at(1) == ty {
span_lint_and_then(
cx,
DERIVED_HASH_WITH_MANUAL_EQ,
span,
"you are deriving `Hash` but have implemented `PartialEq` explicitly",
|diag| {
if let Some(local_def_id) = impl_id.as_local() {
let hir_id = cx.tcx.local_def_id_to_hir_id(local_def_id);
diag.span_note(cx.tcx.hir_span(hir_id), "`PartialEq` implemented here");
}
},
);
}
});
}
}

65
clippy_lints/src/derive/expl_impl_clone_on_copy.rs Normal file
View file

@ -0,0 +1,65 @@
use clippy_utils::diagnostics::span_lint_and_note;
use clippy_utils::ty::{implements_trait, is_copy};
use rustc_hir::{self as hir, Item};
use rustc_lint::LateContext;
use rustc_middle::ty::{self, GenericArgKind, Ty};
use super::EXPL_IMPL_CLONE_ON_COPY;
/// Implementation of the `EXPL_IMPL_CLONE_ON_COPY` lint.
pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, item: &Item<'_>, trait_ref: &hir::TraitRef<'_>, ty: Ty<'tcx>) {
let clone_id = match cx.tcx.lang_items().clone_trait() {
Some(id) if trait_ref.trait_def_id() == Some(id) => id,
_ => return,
};
let Some(copy_id) = cx.tcx.lang_items().copy_trait() else {
return;
};
let (ty_adt, ty_subs) = match *ty.kind() {
// Unions can't derive clone.
ty::Adt(adt, subs) if !adt.is_union() => (adt, subs),
_ => return,
};
// If the current self type doesn't implement Copy (due to generic constraints), search to see if
// there's a Copy impl for any instance of the adt.
if !is_copy(cx, ty) {
if ty_subs.non_erasable_generics().next().is_some() {
let has_copy_impl = cx.tcx.local_trait_impls(copy_id).iter().any(|&id| {
matches!(cx.tcx.type_of(id).instantiate_identity().kind(), ty::Adt(adt, _)
if ty_adt.did() == adt.did())
});
if !has_copy_impl {
return;
}
} else {
return;
}
}
// Derive constrains all generic types to requiring Clone. Check if any type is not constrained for
// this impl.
if ty_subs.types().any(|ty| !implements_trait(cx, ty, clone_id, &[])) {
return;
}
// `#[repr(packed)]` structs with type/const parameters can't derive `Clone`.
// https://github.com/rust-lang/rust-clippy/issues/10188
if ty_adt.repr().packed()
&& ty_subs
.iter()
.any(|arg| matches!(arg.kind(), GenericArgKind::Type(_) | GenericArgKind::Const(_)))
{
return;
}
// The presence of `unsafe` fields prevents deriving `Clone` automatically
if ty_adt.all_fields().any(|f| f.safety.is_unsafe()) {
return;
}
span_lint_and_note(
cx,
EXPL_IMPL_CLONE_ON_COPY,
item.span,
"you are implementing `Clone` explicitly on a `Copy` type",
Some(item.span),
"consider deriving `Clone` or removing `Copy`",
);
}

215
clippy_lints/src/derive/mod.rs Normal file
View file

@ -0,0 +1,215 @@
use rustc_hir::{Impl, Item, ItemKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::declare_lint_pass;
mod derive_ord_xor_partial_ord;
mod derive_partial_eq_without_eq;
mod derived_hash_with_manual_eq;
mod expl_impl_clone_on_copy;
mod unsafe_derive_deserialize;
declare_clippy_lint! {
/// ### What it does
/// Lints against manual `PartialEq` implementations for types with a derived `Hash`
/// implementation.
///
/// ### Why is this bad?
/// The implementation of these traits must agree (for
/// example for use with `HashMap`) so it’s probably a bad idea to use a
/// default-generated `Hash` implementation with an explicitly defined
/// `PartialEq`. In particular, the following must hold for any type:
///
/// ```text
/// k1 == k2 ⇒ hash(k1) == hash(k2)
/// ```
///
/// ### Example
/// ```ignore
/// #[derive(Hash)]
/// struct Foo;
///
/// impl PartialEq for Foo {
/// ...
/// }
/// ```
#[clippy::version = "pre 1.29.0"]
pub DERIVED_HASH_WITH_MANUAL_EQ,
correctness,
"deriving `Hash` but implementing `PartialEq` explicitly"
}
declare_clippy_lint! {
/// ### What it does
/// Lints against manual `PartialOrd` and `Ord` implementations for types with a derived `Ord`
/// or `PartialOrd` implementation.
///
/// ### Why is this bad?
/// The implementation of these traits must agree (for
/// example for use with `sort`) so it’s probably a bad idea to use a
/// default-generated `Ord` implementation with an explicitly defined
/// `PartialOrd`. In particular, the following must hold for any type
/// implementing `Ord`:
///
/// ```text
/// k1.cmp(&k2) == k1.partial_cmp(&k2).unwrap()
/// ```
///
/// ### Example
/// ```rust,ignore
/// #[derive(Ord, PartialEq, Eq)]
/// struct Foo;
///
/// impl PartialOrd for Foo {
/// ...
/// }
/// ```
/// Use instead:
/// ```rust,ignore
/// #[derive(PartialEq, Eq)]
/// struct Foo;
///
/// impl PartialOrd for Foo {
/// fn partial_cmp(&self, other: &Foo) -> Option<Ordering> {
/// Some(self.cmp(other))
/// }
/// }
///
/// impl Ord for Foo {
/// ...
/// }
/// ```
/// or, if you don't need a custom ordering:
/// ```rust,ignore
/// #[derive(Ord, PartialOrd, PartialEq, Eq)]
/// struct Foo;
/// ```
#[clippy::version = "1.47.0"]
pub DERIVE_ORD_XOR_PARTIAL_ORD,
correctness,
"deriving `Ord` but implementing `PartialOrd` explicitly"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for explicit `Clone` implementations for `Copy`
/// types.
///
/// ### Why is this bad?
/// To avoid surprising behavior, these traits should
/// agree and the behavior of `Copy` cannot be overridden. In almost all
/// situations a `Copy` type should have a `Clone` implementation that does
/// nothing more than copy the object, which is what `#[derive(Copy, Clone)]`
/// gets you.
///
/// ### Example
/// ```rust,ignore
/// #[derive(Copy)]
/// struct Foo;
///
/// impl Clone for Foo {
/// // ..
/// }
/// ```
#[clippy::version = "pre 1.29.0"]
pub EXPL_IMPL_CLONE_ON_COPY,
pedantic,
"implementing `Clone` explicitly on `Copy` types"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for deriving `serde::Deserialize` on a type that
/// has methods using `unsafe`.
///
/// ### Why is this bad?
/// Deriving `serde::Deserialize` will create a constructor
/// that may violate invariants held by another constructor.
///
/// ### Example
/// ```rust,ignore
/// use serde::Deserialize;
///
/// #[derive(Deserialize)]
/// pub struct Foo {
/// // ..
/// }
///
/// impl Foo {
/// pub fn new() -> Self {
/// // setup here ..
/// }
///
/// pub unsafe fn parts() -> (&str, &str) {
/// // assumes invariants hold
/// }
/// }
/// ```
#[clippy::version = "1.45.0"]
pub UNSAFE_DERIVE_DESERIALIZE,
pedantic,
"deriving `serde::Deserialize` on a type that has methods using `unsafe`"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for types that derive `PartialEq` and could implement `Eq`.
///
/// ### Why is this bad?
/// If a type `T` derives `PartialEq` and all of its members implement `Eq`,
/// then `T` can always implement `Eq`. Implementing `Eq` allows `T` to be used
/// in APIs that require `Eq` types. It also allows structs containing `T` to derive
/// `Eq` themselves.
///
/// ### Example
/// ```no_run
/// #[derive(PartialEq)]
/// struct Foo {
/// i_am_eq: i32,
/// i_am_eq_too: Vec<String>,
/// }
/// ```
/// Use instead:
/// ```no_run
/// #[derive(PartialEq, Eq)]
/// struct Foo {
/// i_am_eq: i32,
/// i_am_eq_too: Vec<String>,
/// }
/// ```
#[clippy::version = "1.63.0"]
pub DERIVE_PARTIAL_EQ_WITHOUT_EQ,
nursery,
"deriving `PartialEq` on a type that can implement `Eq`, without implementing `Eq`"
}
declare_lint_pass!(Derive => [
EXPL_IMPL_CLONE_ON_COPY,
DERIVED_HASH_WITH_MANUAL_EQ,
DERIVE_ORD_XOR_PARTIAL_ORD,
UNSAFE_DERIVE_DESERIALIZE,
DERIVE_PARTIAL_EQ_WITHOUT_EQ
]);
impl<'tcx> LateLintPass<'tcx> for Derive {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
if let ItemKind::Impl(Impl {
of_trait: Some(of_trait),
..
}) = item.kind
{
let trait_ref = &of_trait.trait_ref;
let ty = cx.tcx.type_of(item.owner_id).instantiate_identity();
let is_automatically_derived = cx.tcx.is_automatically_derived(item.owner_id.to_def_id());
derived_hash_with_manual_eq::check(cx, item.span, trait_ref, ty, is_automatically_derived);
derive_ord_xor_partial_ord::check(cx, item.span, trait_ref, ty, is_automatically_derived);
if is_automatically_derived {
unsafe_derive_deserialize::check(cx, item, trait_ref, ty);
derive_partial_eq_without_eq::check(cx, item.span, trait_ref, ty);
} else {
expl_impl_clone_on_copy::check(cx, item, trait_ref, ty);
}
}
}
}

93
clippy_lints/src/derive/unsafe_derive_deserialize.rs Normal file
View file

@ -0,0 +1,93 @@
use std::ops::ControlFlow;
use clippy_utils::diagnostics::span_lint_hir_and_then;
use clippy_utils::{is_lint_allowed, paths};
use rustc_hir::def_id::LocalDefId;
use rustc_hir::intravisit::{FnKind, Visitor, walk_expr, walk_fn, walk_item};
use rustc_hir::{self as hir, BlockCheckMode, BodyId, Expr, ExprKind, FnDecl, Item, UnsafeSource};
use rustc_lint::LateContext;
use rustc_middle::hir::nested_filter;
use rustc_middle::ty::{self, Ty};
use rustc_span::{Span, sym};
use super::UNSAFE_DERIVE_DESERIALIZE;
/// Implementation of the `UNSAFE_DERIVE_DESERIALIZE` lint.
pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, item: &Item<'_>, trait_ref: &hir::TraitRef<'_>, ty: Ty<'tcx>) {
fn has_unsafe<'tcx>(cx: &LateContext<'tcx>, item: &'tcx Item<'_>) -> bool {
let mut visitor = UnsafeVisitor { cx };
walk_item(&mut visitor, item).is_break()
}
if let Some(trait_def_id) = trait_ref.trait_def_id()
&& paths::SERDE_DESERIALIZE.matches(cx, trait_def_id)
&& let ty::Adt(def, _) = ty.kind()
&& let Some(local_def_id) = def.did().as_local()
&& let adt_hir_id = cx.tcx.local_def_id_to_hir_id(local_def_id)
&& !is_lint_allowed(cx, UNSAFE_DERIVE_DESERIALIZE, adt_hir_id)
&& cx
.tcx
.inherent_impls(def.did())
.iter()
.map(|imp_did| cx.tcx.hir_expect_item(imp_did.expect_local()))
.any(|imp| has_unsafe(cx, imp))
{
span_lint_hir_and_then(
cx,
UNSAFE_DERIVE_DESERIALIZE,
adt_hir_id,
item.span,
"you are deriving `serde::Deserialize` on a type that has methods using `unsafe`",
|diag| {
diag.help(
"consider implementing `serde::Deserialize` manually. See https://serde.rs/impl-deserialize.html",
);
},
);
}
}
struct UnsafeVisitor<'a, 'tcx> {
cx: &'a LateContext<'tcx>,
}
impl<'tcx> Visitor<'tcx> for UnsafeVisitor<'_, 'tcx> {
type Result = ControlFlow<()>;
type NestedFilter = nested_filter::All;
fn visit_fn(
&mut self,
kind: FnKind<'tcx>,
decl: &'tcx FnDecl<'_>,
body_id: BodyId,
_: Span,
id: LocalDefId,
) -> Self::Result {
if let Some(header) = kind.header()
&& header.is_unsafe()
{
ControlFlow::Break(())
} else {
walk_fn(self, kind, decl, body_id, id)
}
}
fn visit_expr(&mut self, expr: &'tcx Expr<'_>) -> Self::Result {
if let ExprKind::Block(block, _) = expr.kind
&& block.rules == BlockCheckMode::UnsafeBlock(UnsafeSource::UserProvided)
&& block
.span
.source_callee()
.and_then(|expr| expr.macro_def_id)
.is_none_or(|did| !self.cx.tcx.is_diagnostic_item(sym::pin_macro, did))
{
return ControlFlow::Break(());
}
walk_expr(self, expr)
}
fn maybe_tcx(&mut self) -> Self::MaybeTyCtxt {
self.cx.tcx
}
}

4
clippy_lints/src/disallowed_macros.rs
View file

@ -1,4 +1,3 @@
use clippy_config::Conf;
use clippy_config::types::{DisallowedPath, create_disallowed_map};
use clippy_utils::diagnostics::{span_lint_and_then, span_lint_hir_and_then};
@ -8,7 +7,8 @@ use rustc_data_structures::fx::FxHashSet;
use rustc_hir::def::DefKind;
use rustc_hir::def_id::DefIdMap;
use rustc_hir::{
AmbigArg, Expr, ExprKind, ForeignItem, HirId, ImplItem, ImplItemImplKind, Item, ItemKind, OwnerId, Pat, Path, Stmt, TraitItem, Ty,
AmbigArg, Expr, ExprKind, ForeignItem, HirId, ImplItem, ImplItemImplKind, Item, ItemKind, OwnerId, Pat, Path, Stmt,
TraitItem, Ty,
};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty::TyCtxt;

27
clippy_lints/src/eta_reduction.rs
View file

@ -197,6 +197,18 @@ fn check_closure<'tcx>(cx: &LateContext<'tcx>, outer_receiver: Option<&Expr<'tcx
// in a type which is `'static`.
// For now ignore all callee types which reference a type parameter.
&& !generic_args.types().any(|t| matches!(t.kind(), ty::Param(_)))
// Rule out `AsyncFn*`s, because while they can be called as `|x| f(x)`,
// they can't be passed directly into a place expecting an `Fn*` (#13892)
&& let Ok((closure_kind, _)) = cx
.tcx
.infer_ctxt()
.build(cx.typing_mode())
.err_ctxt()
.type_implements_fn_trait(
cx.param_env,
Binder::bind_with_vars(callee_ty_adjusted, List::empty()),
ty::PredicatePolarity::Positive,
)
{
span_lint_hir_and_then(
cx,
@ -213,19 +225,10 @@ fn check_closure<'tcx>(cx: &LateContext<'tcx>, outer_receiver: Option<&Expr<'tcx
// 'cuz currently nothing changes after deleting this check.
local_used_in(cx, l, args) || local_used_after_expr(cx, l, expr)
}) {
match cx
.tcx
.infer_ctxt()
.build(cx.typing_mode())
.err_ctxt()
.type_implements_fn_trait(
cx.param_env,
Binder::bind_with_vars(callee_ty_adjusted, List::empty()),
ty::PredicatePolarity::Positive,
) {
match closure_kind {
// Mutable closure is used after current expr; we cannot consume it.
Ok((ClosureKind::FnMut, _)) => snippet = format!("&mut {snippet}"),
Ok((ClosureKind::Fn, _)) if !callee_ty_raw.is_ref() => {
ClosureKind::FnMut => snippet = format!("&mut {snippet}"),
ClosureKind::Fn if !callee_ty_raw.is_ref() => {
snippet = format!("&{snippet}");
},
_ => (),

4
clippy_lints/src/functions/not_unsafe_ptr_arg_deref.rs
View file

@ -4,7 +4,7 @@ use rustc_middle::ty;
use rustc_span::def_id::LocalDefId;
use clippy_utils::diagnostics::span_lint;
use clippy_utils::ty::type_is_unsafe_function;
use clippy_utils::ty::is_unsafe_fn;
use clippy_utils::visitors::for_each_expr;
use clippy_utils::{iter_input_pats, path_to_local};
@ -51,7 +51,7 @@ fn check_raw_ptr<'tcx>(
let typeck = cx.tcx.typeck_body(body.id());
let _: Option<!> = for_each_expr(cx, body.value, |e| {
match e.kind {
hir::ExprKind::Call(f, args) if type_is_unsafe_function(cx, typeck.expr_ty(f)) => {
hir::ExprKind::Call(f, args) if is_unsafe_fn(cx, typeck.expr_ty(f)) => {
for arg in args {
check_arg(cx, &raw_ptrs, arg);
}

48
clippy_lints/src/functions/ref_option.rs
View file

@ -1,23 +1,20 @@
use crate::functions::REF_OPTION;
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::is_trait_impl_item;
use clippy_utils::source::snippet;
use clippy_utils::ty::is_type_diagnostic_item;
use clippy_utils::ty::option_arg_ty;
use clippy_utils::{is_from_proc_macro, is_trait_impl_item};
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_hir::intravisit::FnKind;
use rustc_hir::{FnDecl, HirId};
use rustc_lint::LateContext;
use rustc_middle::ty::{self, GenericArgKind, Mutability, Ty};
use rustc_hir::{self as hir, FnDecl, HirId};
use rustc_lint::{LateContext, LintContext};
use rustc_middle::ty::{self, Mutability, Ty};
use rustc_span::Span;
use rustc_span::def_id::LocalDefId;
use rustc_span::{Span, sym};
fn check_ty<'a>(cx: &LateContext<'a>, param: &rustc_hir::Ty<'a>, param_ty: Ty<'a>, fixes: &mut Vec<(Span, String)>) {
if let ty::Ref(_, opt_ty, Mutability::Not) = param_ty.kind()
&& is_type_diagnostic_item(cx, *opt_ty, sym::Option)
&& let ty::Adt(_, opt_gen_args) = opt_ty.kind()
&& let [gen_arg] = opt_gen_args.as_slice()
&& let GenericArgKind::Type(gen_ty) = gen_arg.kind()
fn check_ty<'a>(cx: &LateContext<'a>, param: &hir::Ty<'a>, param_ty: Ty<'a>, fixes: &mut Vec<(Span, String)>) {
if !param.span.in_external_macro(cx.sess().source_map())
&& let ty::Ref(_, opt_ty, Mutability::Not) = param_ty.kind()
&& let Some(gen_ty) = option_arg_ty(cx, *opt_ty)
&& !gen_ty.is_ref()
// Need to gen the original spans, so first parsing mid, and hir parsing afterward
&& let hir::TyKind::Ref(lifetime, hir::MutTy { ty, .. }) = param.kind
@ -27,6 +24,7 @@ fn check_ty<'a>(cx: &LateContext<'a>, param: &rustc_hir::Ty<'a>, param_ty: Ty<'a
args: [hir::GenericArg::Type(opt_ty)],
..
}) = last.args
&& !is_from_proc_macro(cx, param)
{
let lifetime = snippet(cx, lifetime.ident.span, "..");
fixes.push((
@ -67,21 +65,24 @@ fn check_fn_sig<'a>(cx: &LateContext<'a>, decl: &FnDecl<'a>, span: Span, sig: ty
#[allow(clippy::too_many_arguments)]
pub(crate) fn check_fn<'a>(
cx: &LateContext<'a>,
kind: FnKind<'_>,
kind: FnKind<'a>,
decl: &FnDecl<'a>,
span: Span,
hir_id: HirId,
def_id: LocalDefId,
body: &hir::Body<'_>,
body: &hir::Body<'a>,
avoid_breaking_exported_api: bool,
) {
if avoid_breaking_exported_api && cx.effective_visibilities.is_exported(def_id) {
return;
}
if span.in_external_macro(cx.sess().source_map()) {
return;
}
if let FnKind::Closure = kind {
// Compute the span of the closure parameters + return type if set
let span = if let hir::FnRetTy::Return(out_ty) = &decl.output {
let inputs_output_span = if let hir::FnRetTy::Return(out_ty) = &decl.output {
if decl.inputs.is_empty() {
out_ty.span
} else {
@ -100,9 +101,18 @@ pub(crate) fn check_fn<'a>(
};
let sig = args.as_closure().sig().skip_binder();
check_fn_sig(cx, decl, span, sig);
if is_from_proc_macro(cx, &(&kind, body, hir_id, span)) {
return;
}
check_fn_sig(cx, decl, inputs_output_span, sig);
} else if !is_trait_impl_item(cx, hir_id) {
let sig = cx.tcx.fn_sig(def_id).instantiate_identity().skip_binder();
if is_from_proc_macro(cx, &(&kind, body, hir_id, span)) {
return;
}
check_fn_sig(cx, decl, span, sig);
}
}
@ -112,8 +122,10 @@ pub(super) fn check_trait_item<'a>(
trait_item: &hir::TraitItem<'a>,
avoid_breaking_exported_api: bool,
) {
if let hir::TraitItemKind::Fn(ref sig, _) = trait_item.kind
if !trait_item.span.in_external_macro(cx.sess().source_map())
&& let hir::TraitItemKind::Fn(ref sig, _) = trait_item.kind
&& !(avoid_breaking_exported_api && cx.effective_visibilities.is_exported(trait_item.owner_id.def_id))
&& !is_from_proc_macro(cx, trait_item)
{
let def_id = trait_item.owner_id.def_id;
let ty_sig = cx.tcx.fn_sig(def_id).instantiate_identity().skip_binder();

111
clippy_lints/src/future_not_send.rs
View file

@ -78,66 +78,65 @@ impl<'tcx> LateLintPass<'tcx> for FutureNotSend {
if let ty::Alias(ty::Opaque, AliasTy { def_id, args, .. }) = *ret_ty.kind()
&& let Some(future_trait) = cx.tcx.lang_items().future_trait()
&& let Some(send_trait) = cx.tcx.get_diagnostic_item(sym::Send)
&& let preds = cx.tcx.explicit_item_self_bounds(def_id)
// If is a Future
&& preds
.iter_instantiated_copied(cx.tcx, args)
.filter_map(|(p, _)| p.as_trait_clause())
.any(|trait_pred| trait_pred.skip_binder().trait_ref.def_id == future_trait)
{
let preds = cx.tcx.explicit_item_self_bounds(def_id);
let is_future = preds.iter_instantiated_copied(cx.tcx, args).any(|(p, _)| {
p.as_trait_clause()
.is_some_and(|trait_pred| trait_pred.skip_binder().trait_ref.def_id == future_trait)
let span = decl.output.span();
let infcx = cx.tcx.infer_ctxt().build(cx.typing_mode());
let ocx = ObligationCtxt::new_with_diagnostics(&infcx);
let cause = traits::ObligationCause::misc(span, fn_def_id);
ocx.register_bound(cause, cx.param_env, ret_ty, send_trait);
let send_errors = ocx.select_all_or_error();
// Allow errors that try to prove `Send` for types that "mention" a generic parameter at the "top
// level".
// For example, allow errors that `T: Send` can't be proven, but reject `Rc<T>: Send` errors,
// which is always unconditionally `!Send` for any possible type `T`.
//
// We also allow associated type projections if the self type is either itself a projection or a
// type parameter.
// This is to prevent emitting warnings for e.g. holding a `<Fut as Future>::Output` across await
// points, where `Fut` is a type parameter.
let is_send = send_errors.iter().all(|err| {
err.obligation
.predicate
.as_trait_clause()
.map(Binder::skip_binder)
.is_some_and(|pred| {
pred.def_id() == send_trait
&& pred.self_ty().has_param()
&& TyParamAtTopLevelVisitor.visit_ty(pred.self_ty()) == ControlFlow::Break(true)
})
});
if is_future {
let span = decl.output.span();
let infcx = cx.tcx.infer_ctxt().build(cx.typing_mode());
let ocx = ObligationCtxt::new_with_diagnostics(&infcx);
let cause = traits::ObligationCause::misc(span, fn_def_id);
ocx.register_bound(cause, cx.param_env, ret_ty, send_trait);
let send_errors = ocx.select_all_or_error();
// Allow errors that try to prove `Send` for types that "mention" a generic parameter at the "top
// level".
// For example, allow errors that `T: Send` can't be proven, but reject `Rc<T>: Send` errors,
// which is always unconditionally `!Send` for any possible type `T`.
//
// We also allow associated type projections if the self type is either itself a projection or a
// type parameter.
// This is to prevent emitting warnings for e.g. holding a `<Fut as Future>::Output` across await
// points, where `Fut` is a type parameter.
let is_send = send_errors.iter().all(|err| {
err.obligation
.predicate
.as_trait_clause()
.map(Binder::skip_binder)
.is_some_and(|pred| {
pred.def_id() == send_trait
&& pred.self_ty().has_param()
&& TyParamAtTopLevelVisitor.visit_ty(pred.self_ty()) == ControlFlow::Break(true)
})
});
if !is_send {
span_lint_and_then(
cx,
FUTURE_NOT_SEND,
span,
"future cannot be sent between threads safely",
|db| {
for FulfillmentError { obligation, .. } in send_errors {
infcx
.err_ctxt()
.maybe_note_obligation_cause_for_async_await(db, &obligation);
if let PredicateKind::Clause(ClauseKind::Trait(trait_pred)) =
obligation.predicate.kind().skip_binder()
{
db.note(format!(
"`{}` doesn't implement `{}`",
trait_pred.self_ty(),
trait_pred.trait_ref.print_only_trait_path(),
));
}
if !is_send {
span_lint_and_then(
cx,
FUTURE_NOT_SEND,
span,
"future cannot be sent between threads safely",
|db| {
for FulfillmentError { obligation, .. } in send_errors {
infcx
.err_ctxt()
.maybe_note_obligation_cause_for_async_await(db, &obligation);
if let PredicateKind::Clause(ClauseKind::Trait(trait_pred)) =
obligation.predicate.kind().skip_binder()
{
db.note(format!(
"`{}` doesn't implement `{}`",
trait_pred.self_ty(),
trait_pred.trait_ref.print_only_trait_path(),
));
}
},
);
}
}
},
);
}
}
}

13
clippy_lints/src/invalid_upcast_comparisons.rs
View file

@ -1,3 +1,4 @@
use rustc_errors::Applicability;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty::layout::LayoutOf;
@ -9,7 +10,7 @@ use clippy_utils::comparisons;
use clippy_utils::comparisons::Rel;
use clippy_utils::consts::{ConstEvalCtxt, FullInt};
use clippy_utils::diagnostics::span_lint;
use clippy_utils::source::snippet;
use clippy_utils::source::snippet_with_context;
declare_clippy_lint! {
/// ### What it does
@ -69,13 +70,21 @@ fn numeric_cast_precast_bounds(cx: &LateContext<'_>, expr: &Expr<'_>) -> Option<
fn err_upcast_comparison(cx: &LateContext<'_>, span: Span, expr: &Expr<'_>, always: bool) {
if let ExprKind::Cast(cast_val, _) = expr.kind {
let mut applicability = Applicability::MachineApplicable;
let (cast_val_snip, _) = snippet_with_context(
cx,
cast_val.span,
expr.span.ctxt(),
"the expression",
&mut applicability,
);
span_lint(
cx,
INVALID_UPCAST_COMPARISONS,
span,
format!(
"because of the numeric bounds on `{}` prior to casting, this expression is always {}",
snippet(cx, cast_val.span, "the expression"),
cast_val_snip,
if always { "true" } else { "false" },
),
);

6
clippy_lints/src/len_zero.rs
View file

@ -371,9 +371,9 @@ fn parse_len_output<'tcx>(cx: &LateContext<'tcx>, sig: FnSig<'tcx>) -> Option<Le
match *sig.output().kind() {
ty::Int(_) | ty::Uint(_) => Some(LenOutput::Integral),
ty::Adt(adt, subs) if subs.type_at(0).is_integral() => match cx.tcx.get_diagnostic_name(adt.did()) {
Some(sym::Option) => Some(LenOutput::Option(adt.did())),
Some(sym::Result) => Some(LenOutput::Result(adt.did())),
ty::Adt(adt, subs) => match cx.tcx.get_diagnostic_name(adt.did()) {
Some(sym::Option) => subs.type_at(0).is_integral().then(|| LenOutput::Option(adt.did())),
Some(sym::Result) => subs.type_at(0).is_integral().then(|| LenOutput::Result(adt.did())),
_ => None,
},
_ => None,

16
clippy_lints/src/let_with_type_underscore.rs
View file

@ -1,9 +1,9 @@
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::is_from_proc_macro;
use clippy_utils::source::{IntoSpan, SpanRangeExt};
use rustc_ast::{Local, TyKind};
use rustc_errors::Applicability;
use rustc_hir::{LetStmt, TyKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_lint::{EarlyContext, EarlyLintPass, LintContext};
use rustc_session::declare_lint_pass;
declare_clippy_lint! {
@ -26,14 +26,14 @@ declare_clippy_lint! {
}
declare_lint_pass!(UnderscoreTyped => [LET_WITH_TYPE_UNDERSCORE]);
impl<'tcx> LateLintPass<'tcx> for UnderscoreTyped {
fn check_local(&mut self, cx: &LateContext<'tcx>, local: &'tcx LetStmt<'_>) {
if let Some(ty) = local.ty // Ensure that it has a type defined
&& let TyKind::Infer(()) = &ty.kind // that type is '_'
impl EarlyLintPass for UnderscoreTyped {
fn check_local(&mut self, cx: &EarlyContext<'_>, local: &Local) {
if let Some(ty) = &local.ty // Ensure that it has a type defined
&& let TyKind::Infer = ty.kind // that type is '_'
&& local.span.eq_ctxt(ty.span)
&& let sm = cx.tcx.sess.source_map()
&& let sm = cx.sess().source_map()
&& !local.span.in_external_macro(sm)
&& !is_from_proc_macro(cx, ty)
&& !is_from_proc_macro(cx, &**ty)
{
let span_to_remove = sm
.span_extend_to_prev_char_before(ty.span, ':', true)

6
clippy_lints/src/lib.rs
View file

@ -302,7 +302,6 @@ mod permissions_set_readonly_false;
mod pointers_in_nomem_asm_block;
mod precedence;
mod ptr;
mod ptr_offset_with_cast;
mod pub_underscore_fields;
mod pub_use;
mod question_mark;
@ -360,6 +359,7 @@ mod temporary_assignment;
mod tests_outside_test_module;
mod to_digit_is_some;
mod to_string_trait_impl;
mod toplevel_ref_arg;
mod trailing_empty_array;
mod trait_bounds;
mod transmute;
@ -592,7 +592,6 @@ pub fn register_lint_passes(store: &mut rustc_lint::LintStore, conf: &'static Co
store.register_late_pass(|_| Box::new(unwrap::Unwrap));
store.register_late_pass(move |_| Box::new(indexing_slicing::IndexingSlicing::new(conf)));
store.register_late_pass(move |tcx| Box::new(non_copy_const::NonCopyConst::new(tcx, conf)));
store.register_late_pass(|_| Box::new(ptr_offset_with_cast::PtrOffsetWithCast));
store.register_late_pass(|_| Box::new(redundant_clone::RedundantClone));
store.register_late_pass(|_| Box::new(slow_vector_initialization::SlowVectorInit));
store.register_late_pass(move |_| Box::new(unnecessary_wraps::UnnecessaryWraps::new(conf)));
@ -744,7 +743,7 @@ pub fn register_lint_passes(store: &mut rustc_lint::LintStore, conf: &'static Co
store.register_late_pass(|_| Box::new(missing_assert_message::MissingAssertMessage));
store.register_late_pass(|_| Box::new(needless_maybe_sized::NeedlessMaybeSized));
store.register_late_pass(|_| Box::new(redundant_async_block::RedundantAsyncBlock));
store.register_late_pass(|_| Box::new(let_with_type_underscore::UnderscoreTyped));
store.register_early_pass(|| Box::new(let_with_type_underscore::UnderscoreTyped));
store.register_late_pass(move |_| Box::new(manual_main_separator_str::ManualMainSeparatorStr::new(conf)));
store.register_late_pass(|_| Box::new(unnecessary_struct_initialization::UnnecessaryStruct));
store.register_late_pass(move |_| Box::new(unnecessary_box_returns::UnnecessaryBoxReturns::new(conf)));
@ -831,5 +830,6 @@ pub fn register_lint_passes(store: &mut rustc_lint::LintStore, conf: &'static Co
store.register_late_pass(|_| Box::new(cloned_ref_to_slice_refs::ClonedRefToSliceRefs::new(conf)));
store.register_late_pass(|_| Box::new(infallible_try_from::InfallibleTryFrom));
store.register_late_pass(|_| Box::new(coerce_container_to_any::CoerceContainerToAny));
store.register_late_pass(|_| Box::new(toplevel_ref_arg::ToplevelRefArg));
// add lints here, do not remove this comment, it's used in `new_lint`
}

105
clippy_lints/src/lifetimes.rs
View file

@ -745,7 +745,7 @@ fn report_elidable_impl_lifetimes<'tcx>(
impl_: &'tcx Impl<'_>,
map: &FxIndexMap<LocalDefId, Vec<Usage>>,
) {
let single_usages = map
let (elidable_lts, usages): (Vec<_>, Vec<_>) = map
.iter()
.filter_map(|(def_id, usages)| {
if let [
@ -762,14 +762,12 @@ fn report_elidable_impl_lifetimes<'tcx>(
None
}
})
.collect::<Vec<_>>();
.unzip();
if single_usages.is_empty() {
if elidable_lts.is_empty() {
return;
}
let (elidable_lts, usages): (Vec<_>, Vec<_>) = single_usages.into_iter().unzip();
report_elidable_lifetimes(cx, impl_.generics, &elidable_lts, &usages, true);
}
@ -795,9 +793,7 @@ fn report_elidable_lifetimes(
// In principle, the result of the call to `Node::ident` could be `unwrap`ped, as `DefId` should refer to a
// `Node::GenericParam`.
.filter_map(|&def_id| cx.tcx.hir_node_by_def_id(def_id).ident())
.map(|ident| ident.to_string())
.collect::<Vec<_>>()
.join(", ");
.format(", ");
let elidable_usages: Vec<ElidableUsage> = usages
.iter()
@ -860,36 +856,89 @@ fn elision_suggestions(
.filter(|param| !param.is_elided_lifetime() && !param.is_impl_trait())
.collect::<Vec<_>>();
let mut suggestions = if elidable_lts.len() == explicit_params.len() {
if !elidable_lts
.iter()
.all(|lt| explicit_params.iter().any(|param| param.def_id == *lt))
{
return None;
}
let mut suggestions = if elidable_lts.is_empty() {
vec![]
} else if elidable_lts.len() == explicit_params.len() {
// if all the params are elided remove the whole generic block
//
// fn x<'a>() {}
// ^^^^
vec![(generics.span, String::new())]
} else {
elidable_lts
.iter()
.map(|&id| {
let pos = explicit_params.iter().position(|param| param.def_id == id)?;
let param = explicit_params.get(pos)?;
let span = if let Some(next) = explicit_params.get(pos + 1) {
// fn x<'prev, 'a, 'next>() {}
// ^^^^
param.span.until(next.span)
match &explicit_params[..] {
// no params, nothing to elide
[] => unreachable!("handled by `elidable_lts.is_empty()`"),
[param] => {
if elidable_lts.contains(&param.def_id) {
unreachable!("handled by `elidable_lts.len() == explicit_params.len()`")
} else {
// `pos` should be at least 1 here, because the param in position 0 would either have a `next`
// param or would have taken the `elidable_lts.len() == explicit_params.len()` branch.
let prev = explicit_params.get(pos - 1)?;
unreachable!("handled by `elidable_lts.is_empty()`")
}
},
[_, _, ..] => {
// Given a list like `<'a, 'b, 'c, 'd, ..>`,
//
// If there is a cluster of elidable lifetimes at the beginning, say `'a` and `'b`, we should
// suggest removing them _and_ the trailing comma. The span for that is `a.span.until(c.span)`:
// <'a, 'b, 'c, 'd, ..> => <'a, 'b, 'c, 'd, ..>
// ^^ ^^ ^^^^^^^^
//
// And since we know that `'c` isn't elidable--otherwise it would've been in the cluster--we can go
// over all the lifetimes after it, and for each elidable one, add a suggestion spanning the
// lifetime itself and the comma before, because each individual suggestion is guaranteed to leave
// the list valid:
// <.., 'c, 'd, 'e, 'f, 'g, ..> => <.., 'c, 'd, 'e, 'f, 'g, ..>
// ^^ ^^ ^^ ^^^^ ^^^^^^^^
//
// In case there is no such starting cluster, we only need to do the second part of the algorithm:
// <'a, 'b, 'c, 'd, 'e, 'f, 'g, ..> => <'a, 'b , 'c, 'd, 'e, 'f, 'g, ..>
// ^^ ^^ ^^ ^^ ^^^^^^^^^ ^^^^^^^^
// fn x<'prev, 'a>() {}
// ^^^^
param.span.with_lo(prev.span.hi())
// Split off the starting cluster
// TODO: use `slice::split_once` once stabilized (github.com/rust-lang/rust/issues/112811):
// ```
// let Some(split) = explicit_params.split_once(|param| !elidable_lts.contains(&param.def_id)) else {
// // there were no lifetime param that couldn't be elided
// unreachable!("handled by `elidable_lts.len() == explicit_params.len()`")
// };
// match split { /* .. */ }
// ```
let Some(split_pos) = explicit_params
.iter()
.position(|param| !elidable_lts.contains(&param.def_id))
else {
// there were no lifetime param that couldn't be elided
unreachable!("handled by `elidable_lts.len() == explicit_params.len()`")
};
let split = explicit_params
.split_at_checked(split_pos)
.expect("got `split_pos` from `position` on the same Vec");
Some((span, String::new()))
})
.collect::<Option<Vec<_>>>()?
match split {
([..], []) => unreachable!("handled by `elidable_lts.len() == explicit_params.len()`"),
([], [_]) => unreachable!("handled by `explicit_params.len() == 1`"),
(cluster, rest @ [rest_first, ..]) => {
// the span for the cluster
(cluster.first().map(|fw| fw.span.until(rest_first.span)).into_iter())
// the span for the remaining lifetimes (calculations independent of the cluster)
.chain(
rest.array_windows()
.filter(|[_, curr]| elidable_lts.contains(&curr.def_id))
.map(|[prev, curr]| curr.span.with_lo(prev.span.hi())),
)
.map(|sp| (sp, String::new()))
.collect()
},
}
},
}
};
suggestions.extend(usages.iter().map(|&usage| {

6
clippy_lints/src/loops/explicit_iter_loop.rs
View file

@ -138,9 +138,9 @@ fn is_ref_iterable<'tcx>(
return Some((AdjustKind::None, self_ty));
}
let res_ty = cx
.tcx
.erase_and_anonymize_regions(EarlyBinder::bind(req_res_ty).instantiate(cx.tcx, typeck.node_args(call_expr.hir_id)));
let res_ty = cx.tcx.erase_and_anonymize_regions(
EarlyBinder::bind(req_res_ty).instantiate(cx.tcx, typeck.node_args(call_expr.hir_id)),
);
let mutbl = if let ty::Ref(_, _, mutbl) = *req_self_ty.kind() {
Some(mutbl)
} else {

59
clippy_lints/src/loops/never_loop.rs
View file

@ -22,7 +22,10 @@ pub(super) fn check<'tcx>(
for_loop: Option<&ForLoop<'_>>,
) {
match never_loop_block(cx, block, &mut Vec::new(), loop_id) {
NeverLoopResult::Diverging { ref break_spans } => {
NeverLoopResult::Diverging {
ref break_spans,
ref never_spans,
} => {
span_lint_and_then(cx, NEVER_LOOP, span, "this loop never actually loops", |diag| {
if let Some(ForLoop {
arg: iterator,
@ -34,12 +37,16 @@ pub(super) fn check<'tcx>(
{
// If the block contains a break or continue, or if the loop has a label, `MachineApplicable` is not
// appropriate.
let app = if !contains_any_break_or_continue(block) && label.is_none() {
let mut app = if !contains_any_break_or_continue(block) && label.is_none() {
Applicability::MachineApplicable
} else {
Applicability::Unspecified
};
if !never_spans.is_empty() {
app = Applicability::HasPlaceholders;
}
let mut suggestions = vec![(
for_span.with_hi(iterator.span.hi()),
for_to_if_let_sugg(cx, iterator, pat),
@ -51,6 +58,13 @@ pub(super) fn check<'tcx>(
suggestions,
app,
);
for span in never_spans {
diag.span_help(
*span,
"this code is unreachable. Consider moving the reachable parts out",
);
}
}
});
},
@ -77,13 +91,16 @@ fn contains_any_break_or_continue(block: &Block<'_>) -> bool {
/// The first two bits of information are in this enum, and the last part is in the
/// `local_labels` variable, which contains a list of `(block_id, reachable)` pairs ordered by
/// scope.
#[derive(Clone)]
#[derive(Clone, Debug)]
enum NeverLoopResult {
/// A continue may occur for the main loop.
MayContinueMainLoop,
/// We have not encountered any main loop continue,
/// but we are diverging (subsequent control flow is not reachable)
Diverging { break_spans: Vec<Span> },
Diverging {
break_spans: Vec<Span>,
never_spans: Vec<Span>,
},
/// We have not encountered any main loop continue,
/// and subsequent control flow is (possibly) reachable
Normal,
@ -128,14 +145,18 @@ fn combine_branches(b1: NeverLoopResult, b2: NeverLoopResult) -> NeverLoopResult
(
NeverLoopResult::Diverging {
break_spans: mut break_spans1,
never_spans: mut never_spans1,
},
NeverLoopResult::Diverging {
break_spans: mut break_spans2,
never_spans: mut never_spans2,
},
) => {
break_spans1.append(&mut break_spans2);
never_spans1.append(&mut never_spans2);
NeverLoopResult::Diverging {
break_spans: break_spans1,
never_spans: never_spans1,
}
},
}
@ -207,6 +228,8 @@ fn all_spans_after_expr(cx: &LateContext<'_>, expr: &Expr<'_>) -> Vec<Span> {
}
return vec![stmt.span];
} else if let Node::Block(_) = cx.tcx.parent_hir_node(expr.hir_id) {
return vec![expr.span];
}
vec![]
@ -270,10 +293,13 @@ fn never_loop_expr<'tcx>(
ExprKind::Match(e, arms, _) => {
let e = never_loop_expr(cx, e, local_labels, main_loop_id);
combine_seq(e, || {
arms.iter()
.fold(NeverLoopResult::Diverging { break_spans: vec![] }, |a, b| {
combine_branches(a, never_loop_expr(cx, b.body, local_labels, main_loop_id))
})
arms.iter().fold(
NeverLoopResult::Diverging {
break_spans: vec![],
never_spans: vec![],
},
|a, b| combine_branches(a, never_loop_expr(cx, b.body, local_labels, main_loop_id)),
)
})
},
ExprKind::Block(b, _) => {
@ -296,6 +322,7 @@ fn never_loop_expr<'tcx>(
} else {
NeverLoopResult::Diverging {
break_spans: all_spans_after_expr(cx, expr),
never_spans: vec![],
}
}
},
@ -306,7 +333,10 @@ fn never_loop_expr<'tcx>(
combine_seq(first, || {
// checks if break targets a block instead of a loop
mark_block_as_reachable(expr, local_labels);
NeverLoopResult::Diverging { break_spans: vec![] }
NeverLoopResult::Diverging {
break_spans: vec![],
never_spans: vec![],
}
})
},
ExprKind::Break(dest, e) => {
@ -322,11 +352,15 @@ fn never_loop_expr<'tcx>(
} else {
all_spans_after_expr(cx, expr)
},
never_spans: vec![],
}
})
},
ExprKind::Become(e) => combine_seq(never_loop_expr(cx, e, local_labels, main_loop_id), || {
NeverLoopResult::Diverging { break_spans: vec![] }
NeverLoopResult::Diverging {
break_spans: vec![],
never_spans: vec![],
}
}),
ExprKind::InlineAsm(asm) => combine_seq_many(asm.operands.iter().map(|(o, _)| match o {
InlineAsmOperand::In { expr, .. } | InlineAsmOperand::InOut { expr, .. } => {
@ -356,7 +390,10 @@ fn never_loop_expr<'tcx>(
};
let result = combine_seq(result, || {
if cx.typeck_results().expr_ty(expr).is_never() {
NeverLoopResult::Diverging { break_spans: vec![] }
NeverLoopResult::Diverging {
break_spans: vec![],
never_spans: all_spans_after_expr(cx, expr),
}
} else {
NeverLoopResult::Normal
}

6
clippy_lints/src/manual_abs_diff.rs
View file

@ -4,8 +4,8 @@ use clippy_utils::higher::If;
use clippy_utils::msrvs::{self, Msrv};
use clippy_utils::source::HasSession as _;
use clippy_utils::sugg::Sugg;
use clippy_utils::ty::is_type_diagnostic_item;
use clippy_utils::{eq_expr_value, peel_blocks, peel_middle_ty_refs, span_contains_comment};
use clippy_utils::ty::{is_type_diagnostic_item, peel_and_count_ty_refs};
use clippy_utils::{eq_expr_value, peel_blocks, span_contains_comment};
use rustc_errors::Applicability;
use rustc_hir::{BinOpKind, Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
@ -107,7 +107,7 @@ impl ManualAbsDiff {
|ty| is_type_diagnostic_item(cx, ty, sym::Duration) && self.msrv.meets(cx, msrvs::DURATION_ABS_DIFF);
let a_ty = cx.typeck_results().expr_ty(a).peel_refs();
let (b_ty, b_n_refs) = peel_middle_ty_refs(cx.typeck_results().expr_ty(b));
let (b_ty, b_n_refs, _) = peel_and_count_ty_refs(cx.typeck_results().expr_ty(b));
(a_ty == b_ty && (is_int(a_ty) || is_duration(a_ty))).then_some((a_ty, b_n_refs))
}

6
clippy_lints/src/manual_option_as_slice.rs
View file

@ -1,7 +1,7 @@
use clippy_config::Conf;
use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg};
use clippy_utils::msrvs::Msrv;
use clippy_utils::{is_none_arm, msrvs, peel_hir_expr_refs, sym};
use clippy_utils::{is_none_pattern, msrvs, peel_hir_expr_refs, sym};
use rustc_errors::Applicability;
use rustc_hir::def::{DefKind, Res};
use rustc_hir::{Arm, Expr, ExprKind, LangItem, Pat, PatKind, QPath, is_range_literal};
@ -60,8 +60,8 @@ impl LateLintPass<'_> for ManualOptionAsSlice {
}
match expr.kind {
ExprKind::Match(scrutinee, [arm1, arm2], _) => {
if is_none_arm(cx, arm2) && check_arms(cx, arm2, arm1)
|| is_none_arm(cx, arm1) && check_arms(cx, arm1, arm2)
if is_none_pattern(cx, arm2.pat) && check_arms(cx, arm2, arm1)
|| is_none_pattern(cx, arm1.pat) && check_arms(cx, arm1, arm2)
{
check_as_ref(cx, scrutinee, span, self.msrv);
}

3
clippy_lints/src/manual_slice_size_calculation.rs
View file

@ -2,6 +2,7 @@ use clippy_config::Conf;
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::msrvs::{self, Msrv};
use clippy_utils::source::snippet_with_context;
use clippy_utils::ty::peel_and_count_ty_refs;
use clippy_utils::{expr_or_init, is_in_const_context, std_or_core};
use rustc_errors::Applicability;
use rustc_hir::{BinOpKind, Expr, ExprKind};
@ -102,7 +103,7 @@ fn simplify_half<'tcx>(
&& let ExprKind::MethodCall(method_path, receiver, [], _) = expr1.kind
&& method_path.ident.name == sym::len
&& let receiver_ty = cx.typeck_results().expr_ty(receiver)
&& let (receiver_ty, refs_count) = clippy_utils::ty::walk_ptrs_ty_depth(receiver_ty)
&& let (receiver_ty, refs_count, _) = peel_and_count_ty_refs(receiver_ty)
&& let ty::Slice(ty1) = receiver_ty.kind()
// expr2 is `size_of::<T2>()`?
&& let ExprKind::Call(func, []) = expr2.kind

16
clippy_lints/src/matches/manual_ok_err.rs
View file

@ -1,7 +1,7 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::{indent_of, reindent_multiline};
use clippy_utils::sugg::Sugg;
use clippy_utils::ty::{option_arg_ty, peel_mid_ty_refs_is_mutable};
use clippy_utils::ty::{option_arg_ty, peel_and_count_ty_refs};
use clippy_utils::{get_parent_expr, is_res_lang_ctor, path_res, peel_blocks, span_contains_comment};
use rustc_ast::{BindingMode, Mutability};
use rustc_errors::Applicability;
@ -135,15 +135,11 @@ fn apply_lint(cx: &LateContext<'_>, expr: &Expr<'_>, scrutinee: &Expr<'_>, is_ok
let scrut = Sugg::hir_with_applicability(cx, scrutinee, "..", &mut app).maybe_paren();
let scrutinee_ty = cx.typeck_results().expr_ty(scrutinee);
let (_, n_ref, mutability) = peel_mid_ty_refs_is_mutable(scrutinee_ty);
let prefix = if n_ref > 0 {
if mutability == Mutability::Mut {
".as_mut()"
} else {
".as_ref()"
}
} else {
""
let (_, _, mutability) = peel_and_count_ty_refs(scrutinee_ty);
let prefix = match mutability {
Some(Mutability::Mut) => ".as_mut()",
Some(Mutability::Not) => ".as_ref()",
None => "",
};
let sugg = format!("{scrut}{prefix}.{method}()");

9
clippy_lints/src/matches/manual_utils.rs
View file

@ -2,7 +2,7 @@ use crate::map_unit_fn::OPTION_MAP_UNIT_FN;
use crate::matches::MATCH_AS_REF;
use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
use clippy_utils::sugg::Sugg;
use clippy_utils::ty::{is_copy, is_type_diagnostic_item, peel_mid_ty_refs_is_mutable, type_is_unsafe_function};
use clippy_utils::ty::{is_copy, is_type_diagnostic_item, is_unsafe_fn, peel_and_count_ty_refs};
use clippy_utils::{
CaptureKind, can_move_expr_to_closure, expr_requires_coercion, is_else_clause, is_lint_allowed, is_res_lang_ctor,
path_res, path_to_local_id, peel_blocks, peel_hir_expr_refs, peel_hir_expr_while,
@ -30,8 +30,9 @@ pub(super) fn check_with<'tcx, F>(
where
F: Fn(&LateContext<'tcx>, &'tcx Pat<'_>, &'tcx Expr<'_>, SyntaxContext) -> Option<SomeExpr<'tcx>>,
{
let (scrutinee_ty, ty_ref_count, ty_mutability) =
peel_mid_ty_refs_is_mutable(cx.typeck_results().expr_ty(scrutinee));
let (scrutinee_ty, ty_ref_count, ty_mutability) = peel_and_count_ty_refs(cx.typeck_results().expr_ty(scrutinee));
let ty_mutability = ty_mutability.unwrap_or(Mutability::Mut);
if !(is_type_diagnostic_item(cx, scrutinee_ty, sym::Option)
&& is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(expr), sym::Option))
{
@ -191,7 +192,7 @@ fn can_pass_as_func<'tcx>(cx: &LateContext<'tcx>, binding: HirId, expr: &'tcx Ex
ExprKind::Call(func, [arg])
if path_to_local_id(arg, binding)
&& cx.typeck_results().expr_adjustments(arg).is_empty()
&& !type_is_unsafe_function(cx, cx.typeck_results().expr_ty(func).peel_refs()) =>
&& !is_unsafe_fn(cx, cx.typeck_results().expr_ty(func).peel_refs()) =>
{
Some(func)
},

6
clippy_lints/src/matches/needless_match.rs
View file

@ -1,7 +1,7 @@
use super::NEEDLESS_MATCH;
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
use clippy_utils::ty::{is_type_diagnostic_item, same_type_and_consts};
use clippy_utils::ty::{is_type_diagnostic_item, same_type_modulo_regions};
use clippy_utils::{
SpanlessEq, eq_expr_value, get_parent_expr_for_hir, higher, is_else_clause, is_res_lang_ctor, over, path_res,
peel_blocks_with_stmt,
@ -122,7 +122,7 @@ fn expr_ty_matches_p_ty(cx: &LateContext<'_>, expr: &Expr<'_>, p_expr: &Expr<'_>
// Compare match_expr ty with local in `let local = match match_expr {..}`
Node::LetStmt(local) => {
let results = cx.typeck_results();
return same_type_and_consts(results.node_type(local.hir_id), results.expr_ty(expr));
return same_type_modulo_regions(results.node_type(local.hir_id), results.expr_ty(expr));
},
// compare match_expr ty with RetTy in `fn foo() -> RetTy`
Node::Item(item) => {
@ -133,7 +133,7 @@ fn expr_ty_matches_p_ty(cx: &LateContext<'_>, expr: &Expr<'_>, p_expr: &Expr<'_>
.instantiate_identity()
.output()
.skip_binder();
return same_type_and_consts(output, cx.typeck_results().expr_ty(expr));
return same_type_modulo_regions(output, cx.typeck_results().expr_ty(expr));
}
},
// check the parent expr for this whole block `{ match match_expr {..} }`

10
clippy_lints/src/matches/rest_pat_in_fully_bound_struct.rs
View file

@ -7,7 +7,7 @@ use super::REST_PAT_IN_FULLY_BOUND_STRUCTS;
pub(crate) fn check(cx: &LateContext<'_>, pat: &Pat<'_>) {
if !pat.span.from_expansion()
&& let PatKind::Struct(QPath::Resolved(_, path), fields, Some(_)) = pat.kind
&& let PatKind::Struct(QPath::Resolved(_, path), fields, Some(dotdot)) = pat.kind
&& let Some(def_id) = path.res.opt_def_id()
&& let ty = cx.tcx.type_of(def_id).instantiate_identity()
&& let ty::Adt(def, _) = ty.kind()
@ -15,14 +15,18 @@ pub(crate) fn check(cx: &LateContext<'_>, pat: &Pat<'_>) {
&& fields.len() == def.non_enum_variant().fields.len()
&& !def.non_enum_variant().is_field_list_non_exhaustive()
{
#[expect(clippy::collapsible_span_lint_calls, reason = "rust-clippy#7797")]
span_lint_and_then(
cx,
REST_PAT_IN_FULLY_BOUND_STRUCTS,
pat.span,
"unnecessary use of `..` pattern in struct binding. All fields were already bound",
|diag| {
diag.help("consider removing `..` from this binding");
diag.span_suggestion_verbose(
dotdot,
"consider removing `..` from this binding",
"",
rustc_errors::Applicability::MachineApplicable,
);
},
);
}

8
clippy_lints/src/matches/single_match.rs
View file

@ -2,10 +2,8 @@ use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::source::{
SpanRangeExt, expr_block, snippet, snippet_block_with_context, snippet_with_applicability, snippet_with_context,
};
use clippy_utils::ty::implements_trait;
use clippy_utils::{
is_lint_allowed, is_unit_expr, peel_blocks, peel_hir_pat_refs, peel_middle_ty_refs, peel_n_hir_expr_refs,
};
use clippy_utils::ty::{implements_trait, peel_and_count_ty_refs};
use clippy_utils::{is_lint_allowed, is_unit_expr, peel_blocks, peel_hir_pat_refs, peel_n_hir_expr_refs};
use core::ops::ControlFlow;
use rustc_arena::DroplessArena;
use rustc_errors::{Applicability, Diag};
@ -133,7 +131,7 @@ fn report_single_pattern(
let (pat, pat_ref_count) = peel_hir_pat_refs(arm.pat);
let (msg, sugg) = if let PatKind::Expr(_) = pat.kind
&& let (ty, ty_ref_count) = peel_middle_ty_refs(cx.typeck_results().expr_ty(ex))
&& let (ty, ty_ref_count, _) = peel_and_count_ty_refs(cx.typeck_results().expr_ty(ex))
&& let Some(spe_trait_id) = cx.tcx.lang_items().structural_peq_trait()
&& let Some(pe_trait_id) = cx.tcx.lang_items().eq_trait()
&& (ty.is_integral()

6
clippy_lints/src/methods/implicit_clone.rs
View file

@ -1,7 +1,7 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_context;
use clippy_utils::ty::implements_trait;
use clippy_utils::{is_diag_item_method, is_diag_trait_item, peel_middle_ty_refs, sym};
use clippy_utils::ty::{implements_trait, peel_and_count_ty_refs};
use clippy_utils::{is_diag_item_method, is_diag_trait_item, sym};
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_lint::LateContext;
@ -14,7 +14,7 @@ pub fn check(cx: &LateContext<'_>, method_name: Symbol, expr: &hir::Expr<'_>, re
&& is_clone_like(cx, method_name, method_def_id)
&& let return_type = cx.typeck_results().expr_ty(expr)
&& let input_type = cx.typeck_results().expr_ty(recv)
&& let (input_type, ref_count) = peel_middle_ty_refs(input_type)
&& let (input_type, ref_count, _) = peel_and_count_ty_refs(input_type)
&& !(ref_count > 0 && is_diag_trait_item(cx, method_def_id, sym::ToOwned))
&& let Some(ty_name) = input_type.ty_adt_def().map(|adt_def| cx.tcx.item_name(adt_def.did()))
&& return_type == input_type

4
clippy_lints/src/methods/inefficient_to_string.rs
View file

@ -1,6 +1,6 @@
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::source::snippet_with_applicability;
use clippy_utils::ty::{is_type_lang_item, walk_ptrs_ty_depth};
use clippy_utils::ty::{is_type_lang_item, peel_and_count_ty_refs};
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_lint::LateContext;
@ -24,7 +24,7 @@ pub fn check(
&& let Some(args) = cx.typeck_results().node_args_opt(expr.hir_id)
&& let arg_ty = cx.typeck_results().expr_ty_adjusted(receiver)
&& let self_ty = args.type_at(0)
&& let (deref_self_ty, deref_count) = walk_ptrs_ty_depth(self_ty)
&& let (deref_self_ty, deref_count, _) = peel_and_count_ty_refs(self_ty)
&& deref_count >= 1
&& specializes_tostring(cx, deref_self_ty)
{

5
clippy_lints/src/methods/iter_overeager_cloned.rs
View file

@ -10,8 +10,7 @@ use rustc_middle::mir::{FakeReadCause, Mutability};
use rustc_middle::ty::{self, BorrowKind};
use rustc_span::{Symbol, sym};
use super::ITER_OVEREAGER_CLONED;
use crate::redundant_clone::REDUNDANT_CLONE;
use super::{ITER_OVEREAGER_CLONED, REDUNDANT_ITER_CLONED};
#[derive(Clone, Copy)]
pub(super) enum Op<'a> {
@ -96,7 +95,7 @@ pub(super) fn check<'tcx>(
}
let (lint, msg, trailing_clone) = match op {
Op::RmCloned | Op::NeedlessMove(_) => (REDUNDANT_CLONE, "unneeded cloning of iterator items", ""),
Op::RmCloned | Op::NeedlessMove(_) => (REDUNDANT_ITER_CLONED, "unneeded cloning of iterator items", ""),
Op::LaterCloned | Op::FixClosure(_, _) => (
ITER_OVEREAGER_CLONED,
"unnecessarily eager cloning of iterator items",

75
clippy_lints/src/methods/mod.rs
View file

@ -91,6 +91,7 @@ mod or_fun_call;
mod or_then_unwrap;
mod path_buf_push_overwrite;
mod path_ends_with_ext;
mod ptr_offset_with_cast;
mod range_zip_with_len;
mod read_line_without_trim;
mod readonly_write_lock;
@ -1725,6 +1726,43 @@ declare_clippy_lint! {
"Check for offset calculations on raw pointers to zero-sized types"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for usage of the `offset` pointer method with a `usize` casted to an
/// `isize`.
///
/// ### Why is this bad?
/// If we’re always increasing the pointer address, we can avoid the numeric
/// cast by using the `add` method instead.
///
/// ### Example
/// ```no_run
/// let vec = vec![b'a', b'b', b'c'];
/// let ptr = vec.as_ptr();
/// let offset = 1_usize;
///
/// unsafe {
/// ptr.offset(offset as isize);
/// }
/// ```
///
/// Could be written:
///
/// ```no_run
/// let vec = vec![b'a', b'b', b'c'];
/// let ptr = vec.as_ptr();
/// let offset = 1_usize;
///
/// unsafe {
/// ptr.add(offset);
/// }
/// ```
#[clippy::version = "1.30.0"]
pub PTR_OFFSET_WITH_CAST,
complexity,
"unneeded pointer offset cast"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for `FileType::is_file()`.
@ -4576,6 +4614,31 @@ declare_clippy_lint! {
"hardcoded localhost IP address"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for calls to `Iterator::cloned` where the original value could be used
/// instead.
///
/// ### Why is this bad?
/// It is not always possible for the compiler to eliminate useless allocations and
/// deallocations generated by redundant `clone()`s.
///
/// ### Example
/// ```no_run
/// let x = vec![String::new()];
/// let _ = x.iter().cloned().map(|x| x.len());
/// ```
/// Use instead:
/// ```no_run
/// let x = vec![String::new()];
/// let _ = x.iter().map(|x| x.len());
/// ```
#[clippy::version = "1.90.0"]
pub REDUNDANT_ITER_CLONED,
perf,
"detects redundant calls to `Iterator::cloned`"
}
#[expect(clippy::struct_excessive_bools)]
pub struct Methods {
avoid_breaking_exported_api: bool,
@ -4665,6 +4728,7 @@ impl_lint_pass!(Methods => [
UNINIT_ASSUMED_INIT,
MANUAL_SATURATING_ARITHMETIC,
ZST_OFFSET,
PTR_OFFSET_WITH_CAST,
FILETYPE_IS_FILE,
OPTION_AS_REF_DEREF,
UNNECESSARY_LAZY_EVALUATIONS,
@ -4755,6 +4819,7 @@ impl_lint_pass!(Methods => [
IO_OTHER_ERROR,
SWAP_WITH_TEMPORARY,
IP_CONSTANT,
REDUNDANT_ITER_CLONED,
]);
/// Extracts a method call name, args, and `Span` of the method name.
@ -4960,10 +5025,7 @@ impl Methods {
// Handle method calls whose receiver and arguments may not come from expansion
if let Some((name, recv, args, span, call_span)) = method_call(expr) {
match (name, args) {
(
sym::add | sym::offset | sym::sub | sym::wrapping_offset | sym::wrapping_add | sym::wrapping_sub,
[_arg],
) => {
(sym::add | sym::sub | sym::wrapping_add | sym::wrapping_sub, [_arg]) => {
zst_offset::check(cx, expr, recv);
},
(sym::all, [arg]) => {
@ -5334,6 +5396,11 @@ impl Methods {
},
_ => iter_nth_zero::check(cx, expr, recv, n_arg),
},
(sym::offset | sym::wrapping_offset, [arg]) => {
zst_offset::check(cx, expr, recv);
ptr_offset_with_cast::check(cx, name, expr, recv, arg, self.msrv);
},
(sym::ok_or_else, [arg]) => {
unnecessary_lazy_eval::check(cx, expr, recv, arg, "ok_or");
},

5
clippy_lints/src/methods/mut_mutex_lock.rs
View file

@ -1,6 +1,6 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::expr_custom_deref_adjustment;
use clippy_utils::ty::{is_type_diagnostic_item, peel_mid_ty_refs_is_mutable};
use clippy_utils::ty::{is_type_diagnostic_item, peel_and_count_ty_refs};
use rustc_errors::Applicability;
use rustc_hir::{Expr, Mutability};
use rustc_lint::LateContext;
@ -10,8 +10,7 @@ use super::MUT_MUTEX_LOCK;
pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, ex: &'tcx Expr<'tcx>, recv: &'tcx Expr<'tcx>, name_span: Span) {
if matches!(expr_custom_deref_adjustment(cx, recv), None | Some(Mutability::Mut))
&& let (_, ref_depth, Mutability::Mut) = peel_mid_ty_refs_is_mutable(cx.typeck_results().expr_ty(recv))
&& ref_depth >= 1
&& let (_, _, Some(Mutability::Mut)) = peel_and_count_ty_refs(cx.typeck_results().expr_ty(recv))
&& let Some(method_id) = cx.typeck_results().type_dependent_def_id(ex.hir_id)
&& let Some(impl_id) = cx.tcx.impl_of_assoc(method_id)
&& is_type_diagnostic_item(cx, cx.tcx.type_of(impl_id).instantiate_identity(), sym::Mutex)

7
clippy_lints/src/methods/or_fun_call.rs
View file

@ -2,6 +2,7 @@ use std::ops::ControlFlow;
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::eager_or_lazy::switch_to_lazy_eval;
use clippy_utils::higher::VecArgs;
use clippy_utils::source::snippet_with_context;
use clippy_utils::ty::{expr_type_is_certain, implements_trait, is_type_diagnostic_item};
use clippy_utils::visitors::for_each_expr;
@ -97,6 +98,12 @@ pub(super) fn check<'tcx>(
return false;
}
// `.unwrap_or(vec![])` is as readable as `.unwrap_or_default()`. And if the expression is a
// non-empty `Vec`, then it will not be a default value anyway. Bail out in all cases.
if call_expr.and_then(|call_expr| VecArgs::hir(cx, call_expr)).is_some() {
return false;
}
// needs to target Default::default in particular or be *::new and have a Default impl
// available
if (is_new(fun) && output_type_implements_default(fun))

82
clippy_lints/src/methods/ptr_offset_with_cast.rs Normal file
View file

@ -0,0 +1,82 @@
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::msrvs::{self, Msrv};
use clippy_utils::sym;
use rustc_errors::Applicability;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::LateContext;
use rustc_span::Symbol;
use std::fmt;
use super::PTR_OFFSET_WITH_CAST;
pub(super) fn check(
cx: &LateContext<'_>,
method: Symbol,
expr: &Expr<'_>,
recv: &Expr<'_>,
arg: &Expr<'_>,
msrv: Msrv,
) {
// `pointer::add` and `pointer::wrapping_add` are only stable since 1.26.0. These functions
// became const-stable in 1.61.0, the same version that `pointer::offset` became const-stable.
if !msrv.meets(cx, msrvs::POINTER_ADD_SUB_METHODS) {
return;
}
let method = match method {
sym::offset => Method::Offset,
sym::wrapping_offset => Method::WrappingOffset,
_ => return,
};
if !cx.typeck_results().expr_ty_adjusted(recv).is_raw_ptr() {
return;
}
// Check if the argument to the method call is a cast from usize.
let cast_lhs_expr = match arg.kind {
ExprKind::Cast(lhs, _) if cx.typeck_results().expr_ty(lhs).is_usize() => lhs,
_ => return,
};
let ExprKind::MethodCall(method_name, _, _, _) = expr.kind else {
return;
};
let msg = format!("use of `{method}` with a `usize` casted to an `isize`");
span_lint_and_then(cx, PTR_OFFSET_WITH_CAST, expr.span, msg, |diag| {
diag.multipart_suggestion(
format!("use `{}` instead", method.suggestion()),
vec![
(method_name.ident.span, method.suggestion().to_string()),
(arg.span.with_lo(cast_lhs_expr.span.hi()), String::new()),
],
Applicability::MachineApplicable,
);
});
}
#[derive(Copy, Clone)]
enum Method {
Offset,
WrappingOffset,
}
impl Method {
#[must_use]
fn suggestion(self) -> &'static str {
match self {
Self::Offset => "add",
Self::WrappingOffset => "wrapping_add",
}
}
}
impl fmt::Display for Method {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Offset => write!(f, "offset"),
Self::WrappingOffset => write!(f, "wrapping_offset"),
}
}
}

13
clippy_lints/src/methods/unnecessary_to_owned.rs
View file

@ -3,11 +3,12 @@ use super::unnecessary_iter_cloned::{self, is_into_iter};
use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
use clippy_utils::msrvs::{self, Msrv};
use clippy_utils::source::{SpanRangeExt, snippet};
use clippy_utils::ty::{get_iterator_item_ty, implements_trait, is_copy, is_type_diagnostic_item, is_type_lang_item};
use clippy_utils::ty::{
get_iterator_item_ty, implements_trait, is_copy, is_type_diagnostic_item, is_type_lang_item, peel_and_count_ty_refs,
};
use clippy_utils::visitors::find_all_ret_expressions;
use clippy_utils::{
fn_def_id, get_parent_expr, is_diag_item_method, is_diag_trait_item, is_expr_temporary_value, peel_middle_ty_refs,
return_ty, sym,
fn_def_id, get_parent_expr, is_diag_item_method, is_diag_trait_item, is_expr_temporary_value, return_ty, sym,
};
use rustc_errors::Applicability;
use rustc_hir::def::{DefKind, Res};
@ -119,8 +120,8 @@ fn check_addr_of_expr(
},
] = adjustments[..]
&& let receiver_ty = cx.typeck_results().expr_ty(receiver)
&& let (target_ty, n_target_refs) = peel_middle_ty_refs(*target_ty)
&& let (receiver_ty, n_receiver_refs) = peel_middle_ty_refs(receiver_ty)
&& let (target_ty, n_target_refs, _) = peel_and_count_ty_refs(*target_ty)
&& let (receiver_ty, n_receiver_refs, _) = peel_and_count_ty_refs(receiver_ty)
// Only flag cases satisfying at least one of the following three conditions:
// * the referent and receiver types are distinct
// * the referent/receiver type is a copyable array
@ -385,7 +386,7 @@ fn check_other_call_arg<'tcx>(
&& let fn_sig = cx.tcx.fn_sig(callee_def_id).instantiate_identity().skip_binder()
&& let Some(i) = recv.into_iter().chain(call_args).position(|arg| arg.hir_id == maybe_arg.hir_id)
&& let Some(input) = fn_sig.inputs().get(i)
&& let (input, n_refs) = peel_middle_ty_refs(*input)
&& let (input, n_refs, _) = peel_and_count_ty_refs(*input)
&& let (trait_predicates, _) = get_input_traits_and_projections(cx, callee_def_id, input)
&& let Some(sized_def_id) = cx.tcx.lang_items().sized_trait()
&& let Some(meta_sized_def_id) = cx.tcx.lang_items().meta_sized_trait()

6
clippy_lints/src/methods/useless_asref.rs
View file

@ -1,6 +1,6 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
use clippy_utils::ty::{implements_trait, should_call_clone_as_function, walk_ptrs_ty_depth};
use clippy_utils::ty::{implements_trait, peel_and_count_ty_refs, should_call_clone_as_function};
use clippy_utils::{get_parent_expr, is_diag_trait_item, path_to_local_id, peel_blocks, strip_pat_refs};
use rustc_errors::Applicability;
use rustc_hir::{self as hir, LangItem};
@ -50,8 +50,8 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, call_name: Symbo
// check if the type after `as_ref` or `as_mut` is the same as before
let rcv_ty = cx.typeck_results().expr_ty(recvr);
let res_ty = cx.typeck_results().expr_ty(expr);
let (base_res_ty, res_depth) = walk_ptrs_ty_depth(res_ty);
let (base_rcv_ty, rcv_depth) = walk_ptrs_ty_depth(rcv_ty);
let (base_res_ty, res_depth, _) = peel_and_count_ty_refs(res_ty);
let (base_rcv_ty, rcv_depth, _) = peel_and_count_ty_refs(rcv_ty);
if base_rcv_ty == base_res_ty && rcv_depth >= res_depth {
if let Some(parent) = get_parent_expr(cx, expr) {
// allow the `as_ref` or `as_mut` if it is followed by another method call

6
clippy_lints/src/min_ident_chars.rs
View file

@ -256,7 +256,11 @@ fn is_not_in_trait_impl(cx: &LateContext<'_>, pat: &Pat<'_>, ident: Ident) -> bo
}
fn get_param_name(impl_item: &ImplItem<'_>, cx: &LateContext<'_>, ident: Ident) -> Option<Symbol> {
if let ImplItemImplKind::Trait { trait_item_def_id: Ok(trait_item_def_id), .. } = impl_item.impl_kind {
if let ImplItemImplKind::Trait {
trait_item_def_id: Ok(trait_item_def_id),
..
} = impl_item.impl_kind
{
let trait_param_names = cx.tcx.fn_arg_idents(trait_item_def_id);
let ImplItemKind::Fn(_, body_id) = impl_item.kind else {

118
clippy_lints/src/misc.rs
View file

@ -1,57 +1,11 @@
use clippy_utils::diagnostics::{span_lint_and_then, span_lint_hir, span_lint_hir_and_then};
use clippy_utils::source::{snippet, snippet_with_context};
use clippy_utils::diagnostics::{span_lint_and_then, span_lint_hir_and_then};
use clippy_utils::sugg::Sugg;
use clippy_utils::{
SpanlessEq, fulfill_or_allowed, get_parent_expr, in_automatically_derived, is_lint_allowed, iter_input_pats,
last_path_segment,
};
use clippy_utils::{SpanlessEq, fulfill_or_allowed, get_parent_expr, in_automatically_derived, last_path_segment};
use rustc_errors::Applicability;
use rustc_hir::def::Res;
use rustc_hir::intravisit::FnKind;
use rustc_hir::{
BinOpKind, BindingMode, Body, ByRef, Expr, ExprKind, FnDecl, Mutability, PatKind, QPath, Stmt, StmtKind,
};
use rustc_hir::{BinOpKind, Expr, ExprKind, QPath, Stmt, StmtKind};
use rustc_lint::{LateContext, LateLintPass, LintContext};
use rustc_session::declare_lint_pass;
use rustc_span::Span;
use rustc_span::def_id::LocalDefId;
use crate::ref_patterns::REF_PATTERNS;
declare_clippy_lint! {
/// ### What it does
/// Checks for function arguments and let bindings denoted as
/// `ref`.
///
/// ### Why is this bad?
/// The `ref` declaration makes the function take an owned
/// value, but turns the argument into a reference (which means that the value
/// is destroyed when exiting the function). This adds not much value: either
/// take a reference type, or take an owned value and create references in the
/// body.
///
/// For let bindings, `let x = &foo;` is preferred over `let ref x = foo`. The
/// type of `x` is more obvious with the former.
///
/// ### Known problems
/// If the argument is dereferenced within the function,
/// removing the `ref` will lead to errors. This can be fixed by removing the
/// dereferences, e.g., changing `*x` to `x` within the function.
///
/// ### Example
/// ```no_run
/// fn foo(ref _x: u8) {}
/// ```
///
/// Use instead:
/// ```no_run
/// fn foo(_x: &u8) {}
/// ```
#[clippy::version = "pre 1.29.0"]
pub TOPLEVEL_REF_ARG,
style,
"an entire binding declared as `ref`, in a function argument or a `let` statement"
}
declare_clippy_lint! {
/// ### What it does
@ -140,79 +94,13 @@ declare_clippy_lint! {
}
declare_lint_pass!(LintPass => [
TOPLEVEL_REF_ARG,
USED_UNDERSCORE_BINDING,
USED_UNDERSCORE_ITEMS,
SHORT_CIRCUIT_STATEMENT,
]);
impl<'tcx> LateLintPass<'tcx> for LintPass {
fn check_fn(
&mut self,
cx: &LateContext<'tcx>,
k: FnKind<'tcx>,
decl: &'tcx FnDecl<'_>,
body: &'tcx Body<'_>,
_: Span,
_: LocalDefId,
) {
if !matches!(k, FnKind::Closure) {
for arg in iter_input_pats(decl, body) {
if let PatKind::Binding(BindingMode(ByRef::Yes(_), _), ..) = arg.pat.kind
&& is_lint_allowed(cx, REF_PATTERNS, arg.pat.hir_id)
&& !arg.span.in_external_macro(cx.tcx.sess.source_map())
{
span_lint_hir(
cx,
TOPLEVEL_REF_ARG,
arg.hir_id,
arg.pat.span,
"`ref` directly on a function parameter does not prevent taking ownership of the passed argument. \
Consider using a reference type instead",
);
}
}
}
}
fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
if let StmtKind::Let(local) = stmt.kind
&& let PatKind::Binding(BindingMode(ByRef::Yes(mutabl), _), .., name, None) = local.pat.kind
&& let Some(init) = local.init
// Do not emit if clippy::ref_patterns is not allowed to avoid having two lints for the same issue.
&& is_lint_allowed(cx, REF_PATTERNS, local.pat.hir_id)
&& !stmt.span.in_external_macro(cx.tcx.sess.source_map())
{
let ctxt = local.span.ctxt();
let mut app = Applicability::MachineApplicable;
let sugg_init = Sugg::hir_with_context(cx, init, ctxt, "..", &mut app);
let (mutopt, initref) = if mutabl == Mutability::Mut {
("mut ", sugg_init.mut_addr())
} else {
("", sugg_init.addr())
};
let tyopt = if let Some(ty) = local.ty {
let ty_snip = snippet_with_context(cx, ty.span, ctxt, "_", &mut app).0;
format!(": &{mutopt}{ty_snip}")
} else {
String::new()
};
span_lint_hir_and_then(
cx,
TOPLEVEL_REF_ARG,
init.hir_id,
local.pat.span,
"`ref` on an entire `let` pattern is discouraged, take a reference with `&` instead",
|diag| {
diag.span_suggestion(
stmt.span,
"try",
format!("let {name}{tyopt} = {initref};", name = snippet(cx, name.span, ".."),),
app,
);
},
);
}
if let StmtKind::Semi(expr) = stmt.kind
&& let ExprKind::Binary(binop, a, b) = &expr.kind
&& matches!(binop.node, BinOpKind::And | BinOpKind::Or)

2
clippy_lints/src/missing_doc.rs
View file

@ -250,7 +250,7 @@ impl<'tcx> LateLintPass<'tcx> for MissingDoc {
AssocContainer::Trait | AssocContainer::TraitImpl(_) => {
note_prev_span_then_ret!(self.prev_span, impl_item.span);
},
AssocContainer::InherentImpl => {}
AssocContainer::InherentImpl => {},
}
let (article, desc) = cx.tcx.article_and_description(impl_item.owner_id.to_def_id());

8
clippy_lints/src/multiple_unsafe_ops_per_block.rs
View file

@ -1,3 +1,4 @@
use clippy_utils::desugar_await;
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::visitors::{Descend, Visitable, for_each_expr};
use core::ops::ControlFlow::Continue;
@ -97,6 +98,13 @@ fn collect_unsafe_exprs<'tcx>(
) {
for_each_expr(cx, node, |expr| {
match expr.kind {
// The `await` itself will desugar to two unsafe calls, but we should ignore those.
// Instead, check the expression that is `await`ed
_ if let Some(e) = desugar_await(expr) => {
collect_unsafe_exprs(cx, e, unsafe_ops);
return Continue(Descend::No);
},
ExprKind::InlineAsm(_) => unsafe_ops.push(("inline assembly used here", expr.span)),
ExprKind::Field(e, _) => {

4
clippy_lints/src/only_used_in_recursion.rs
View file

@ -252,7 +252,9 @@ impl<'tcx> LateLintPass<'tcx> for OnlyUsedInRecursion {
{
(
trait_item_id,
FnKind::ImplTraitFn(std::ptr::from_ref(cx.tcx.erase_and_anonymize_regions(trait_ref.args)) as usize),
FnKind::ImplTraitFn(
std::ptr::from_ref(cx.tcx.erase_and_anonymize_regions(trait_ref.args)) as usize
),
usize::from(sig.decl.implicit_self.has_implicit_self()),
)
} else {

4
clippy_lints/src/operators/erasing_op.rs
View file

@ -1,6 +1,6 @@
use clippy_utils::consts::{ConstEvalCtxt, Constant};
use clippy_utils::diagnostics::span_lint;
use clippy_utils::ty::same_type_and_consts;
use clippy_utils::ty::same_type_modulo_regions;
use rustc_hir::{BinOpKind, Expr};
use rustc_lint::LateContext;
@ -29,7 +29,7 @@ pub(super) fn check<'tcx>(
fn different_types(tck: &TypeckResults<'_>, input: &Expr<'_>, output: &Expr<'_>) -> bool {
let input_ty = tck.expr_ty(input).peel_refs();
let output_ty = tck.expr_ty(output).peel_refs();
!same_type_and_consts(input_ty, output_ty)
!same_type_modulo_regions(input_ty, output_ty)
}
fn check_op<'tcx>(

151
clippy_lints/src/ptr_offset_with_cast.rs
View file

@ -1,151 +0,0 @@
use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg};
use clippy_utils::source::SpanRangeExt;
use clippy_utils::sym;
use rustc_errors::Applicability;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::declare_lint_pass;
use std::fmt;
declare_clippy_lint! {
/// ### What it does
/// Checks for usage of the `offset` pointer method with a `usize` casted to an
/// `isize`.
///
/// ### Why is this bad?
/// If we’re always increasing the pointer address, we can avoid the numeric
/// cast by using the `add` method instead.
///
/// ### Example
/// ```no_run
/// let vec = vec![b'a', b'b', b'c'];
/// let ptr = vec.as_ptr();
/// let offset = 1_usize;
///
/// unsafe {
/// ptr.offset(offset as isize);
/// }
/// ```
///
/// Could be written:
///
/// ```no_run
/// let vec = vec![b'a', b'b', b'c'];
/// let ptr = vec.as_ptr();
/// let offset = 1_usize;
///
/// unsafe {
/// ptr.add(offset);
/// }
/// ```
#[clippy::version = "1.30.0"]
pub PTR_OFFSET_WITH_CAST,
complexity,
"unneeded pointer offset cast"
}
declare_lint_pass!(PtrOffsetWithCast => [PTR_OFFSET_WITH_CAST]);
impl<'tcx> LateLintPass<'tcx> for PtrOffsetWithCast {
fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
// Check if the expressions is a ptr.offset or ptr.wrapping_offset method call
let Some((receiver_expr, arg_expr, method)) = expr_as_ptr_offset_call(cx, expr) else {
return;
};
// Check if the argument to the method call is a cast from usize
let Some(cast_lhs_expr) = expr_as_cast_from_usize(cx, arg_expr) else {
return;
};
let msg = format!("use of `{method}` with a `usize` casted to an `isize`");
if let Some(sugg) = build_suggestion(cx, method, receiver_expr, cast_lhs_expr) {
span_lint_and_sugg(
cx,
PTR_OFFSET_WITH_CAST,
expr.span,
msg,
"try",
sugg,
Applicability::MachineApplicable,
);
} else {
span_lint(cx, PTR_OFFSET_WITH_CAST, expr.span, msg);
}
}
}
// If the given expression is a cast from a usize, return the lhs of the cast
fn expr_as_cast_from_usize<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<&'tcx Expr<'tcx>> {
if let ExprKind::Cast(cast_lhs_expr, _) = expr.kind
&& is_expr_ty_usize(cx, cast_lhs_expr)
{
return Some(cast_lhs_expr);
}
None
}
// If the given expression is a ptr::offset or ptr::wrapping_offset method call, return the
// receiver, the arg of the method call, and the method.
fn expr_as_ptr_offset_call<'tcx>(
cx: &LateContext<'tcx>,
expr: &'tcx Expr<'_>,
) -> Option<(&'tcx Expr<'tcx>, &'tcx Expr<'tcx>, Method)> {
if let ExprKind::MethodCall(path_segment, arg_0, [arg_1], _) = &expr.kind
&& is_expr_ty_raw_ptr(cx, arg_0)
{
if path_segment.ident.name == sym::offset {
return Some((arg_0, arg_1, Method::Offset));
}
if path_segment.ident.name == sym::wrapping_offset {
return Some((arg_0, arg_1, Method::WrappingOffset));
}
}
None
}
// Is the type of the expression a usize?
fn is_expr_ty_usize(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
cx.typeck_results().expr_ty(expr) == cx.tcx.types.usize
}
// Is the type of the expression a raw pointer?
fn is_expr_ty_raw_ptr(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
cx.typeck_results().expr_ty(expr).is_raw_ptr()
}
fn build_suggestion(
cx: &LateContext<'_>,
method: Method,
receiver_expr: &Expr<'_>,
cast_lhs_expr: &Expr<'_>,
) -> Option<String> {
let receiver = receiver_expr.span.get_source_text(cx)?;
let cast_lhs = cast_lhs_expr.span.get_source_text(cx)?;
Some(format!("{receiver}.{}({cast_lhs})", method.suggestion()))
}
#[derive(Copy, Clone)]
enum Method {
Offset,
WrappingOffset,
}
impl Method {
#[must_use]
fn suggestion(self) -> &'static str {
match self {
Self::Offset => "add",
Self::WrappingOffset => "wrapping_add",
}
}
}
impl fmt::Display for Method {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::Offset => write!(f, "offset"),
Self::WrappingOffset => write!(f, "wrapping_offset"),
}
}
}

21
clippy_lints/src/question_mark.rs
View file

@ -8,9 +8,9 @@ use clippy_utils::source::snippet_with_applicability;
use clippy_utils::sugg::Sugg;
use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
use clippy_utils::{
eq_expr_value, higher, is_else_clause, is_in_const_context, is_lint_allowed, is_path_lang_item, is_res_lang_ctor,
pat_and_expr_can_be_question_mark, path_res, path_to_local, path_to_local_id, peel_blocks, peel_blocks_with_stmt,
span_contains_cfg, span_contains_comment, sym,
eq_expr_value, fn_def_id_with_node_args, higher, is_else_clause, is_in_const_context, is_lint_allowed,
is_path_lang_item, is_res_lang_ctor, pat_and_expr_can_be_question_mark, path_res, path_to_local, path_to_local_id,
peel_blocks, peel_blocks_with_stmt, span_contains_cfg, span_contains_comment, sym,
};
use rustc_errors::Applicability;
use rustc_hir::LangItem::{self, OptionNone, OptionSome, ResultErr, ResultOk};
@ -393,8 +393,8 @@ fn check_arm_is_none_or_err<'tcx>(cx: &LateContext<'tcx>, mode: TryMode, arm: &A
&& let ExprKind::Ret(Some(wrapped_ret_expr)) = arm_body.kind
&& let ExprKind::Call(ok_ctor, [ret_expr]) = wrapped_ret_expr.kind
&& is_res_lang_ctor(cx, path_res(cx, ok_ctor), ResultErr)
// check `...` is `val` from binding
&& path_to_local_id(ret_expr, ok_val)
// check if `...` is `val` from binding or `val.into()`
&& is_local_or_local_into(cx, ret_expr, ok_val)
{
true
} else {
@ -417,6 +417,17 @@ fn check_arm_is_none_or_err<'tcx>(cx: &LateContext<'tcx>, mode: TryMode, arm: &A
}
}
/// Check if `expr` is `val` or `val.into()`
fn is_local_or_local_into(cx: &LateContext<'_>, expr: &Expr<'_>, val: HirId) -> bool {
let is_into_call = fn_def_id_with_node_args(cx, expr)
.and_then(|(fn_def_id, _)| cx.tcx.trait_of_assoc(fn_def_id))
.is_some_and(|trait_def_id| cx.tcx.is_diagnostic_item(sym::Into, trait_def_id));
match expr.kind {
ExprKind::MethodCall(_, recv, [], _) | ExprKind::Call(_, [recv]) => is_into_call && path_to_local_id(recv, val),
_ => path_to_local_id(expr, val),
}
}
fn check_arms_are_try<'tcx>(cx: &LateContext<'tcx>, mode: TryMode, arm1: &Arm<'tcx>, arm2: &Arm<'tcx>) -> bool {
(check_arm_is_some_or_ok(cx, mode, arm1) && check_arm_is_none_or_err(cx, mode, arm2))
|| (check_arm_is_some_or_ok(cx, mode, arm2) && check_arm_is_none_or_err(cx, mode, arm1))

27
clippy_lints/src/read_zero_byte_vec.rs
View file

@ -1,6 +1,6 @@
use clippy_utils::diagnostics::{span_lint_hir, span_lint_hir_and_then};
use clippy_utils::higher::{VecInitKind, get_vec_init_kind};
use clippy_utils::source::snippet;
use clippy_utils::source::{indent_of, snippet};
use clippy_utils::{get_enclosing_block, sym};
use rustc_errors::Applicability;
@ -83,10 +83,12 @@ impl<'tcx> LateLintPass<'tcx> for ReadZeroByteVec {
expr.span,
"reading zero byte data to `Vec`",
|diag| {
let span = first_stmt_containing_expr(cx, expr).map_or(expr.span, |stmt| stmt.span);
let indent = indent_of(cx, span).unwrap_or(0);
diag.span_suggestion(
expr.span,
span.shrink_to_lo(),
"try",
format!("{}.resize({len}, 0); {}", ident, snippet(cx, expr.span, "..")),
format!("{ident}.resize({len}, 0);\n{}", " ".repeat(indent)),
applicability,
);
},
@ -100,14 +102,15 @@ impl<'tcx> LateLintPass<'tcx> for ReadZeroByteVec {
expr.span,
"reading zero byte data to `Vec`",
|diag| {
let span = first_stmt_containing_expr(cx, expr).map_or(expr.span, |stmt| stmt.span);
let indent = indent_of(cx, span).unwrap_or(0);
diag.span_suggestion(
expr.span,
span.shrink_to_lo(),
"try",
format!(
"{}.resize({}, 0); {}",
ident,
"{ident}.resize({}, 0);\n{}",
snippet(cx, e.span, ".."),
snippet(cx, expr.span, "..")
" ".repeat(indent)
),
applicability,
);
@ -130,6 +133,16 @@ impl<'tcx> LateLintPass<'tcx> for ReadZeroByteVec {
}
}
fn first_stmt_containing_expr<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> Option<&'tcx hir::Stmt<'tcx>> {
cx.tcx.hir_parent_iter(expr.hir_id).find_map(|(_, node)| {
if let hir::Node::Stmt(stmt) = node {
Some(stmt)
} else {
None
}
})
}
struct ReadVecVisitor<'tcx> {
local_id: HirId,
read_zero_expr: Option<&'tcx Expr<'tcx>>,

4
clippy_lints/src/redundant_clone.rs
View file

@ -2,7 +2,7 @@ use clippy_utils::diagnostics::{span_lint_hir, span_lint_hir_and_then};
use clippy_utils::fn_has_unsatisfiable_preds;
use clippy_utils::mir::{LocalUsage, PossibleBorrowerMap, visit_local_usage};
use clippy_utils::source::SpanRangeExt;
use clippy_utils::ty::{has_drop, is_copy, is_type_lang_item, walk_ptrs_ty_depth};
use clippy_utils::ty::{has_drop, is_copy, is_type_lang_item, peel_and_count_ty_refs};
use rustc_errors::Applicability;
use rustc_hir::intravisit::FnKind;
use rustc_hir::{Body, FnDecl, LangItem, def_id};
@ -263,7 +263,7 @@ fn is_call_with_ref_arg<'tcx>(
&& args.len() == 1
&& let mir::Operand::Move(mir::Place { local, .. }) = &args[0].node
&& let ty::FnDef(def_id, _) = *func.ty(mir, cx.tcx).kind()
&& let (inner_ty, 1) = walk_ptrs_ty_depth(args[0].node.ty(mir, cx.tcx))
&& let (inner_ty, 1, _) = peel_and_count_ty_refs(args[0].node.ty(mir, cx.tcx))
&& !is_copy(cx, inner_ty)
{
Some((def_id, *local, inner_ty, destination.as_local()?))

8
clippy_lints/src/redundant_slicing.rs
View file

@ -1,7 +1,7 @@
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::get_parent_expr;
use clippy_utils::source::snippet_with_context;
use clippy_utils::ty::is_type_lang_item;
use clippy_utils::{get_parent_expr, peel_middle_ty_refs};
use clippy_utils::ty::{is_type_lang_item, peel_and_count_ty_refs};
use rustc_ast::util::parser::ExprPrecedence;
use rustc_errors::Applicability;
use rustc_hir::{BorrowKind, Expr, ExprKind, LangItem, Mutability};
@ -82,8 +82,8 @@ impl<'tcx> LateLintPass<'tcx> for RedundantSlicing {
&& let ExprKind::Index(indexed, range, _) = addressee.kind
&& is_type_lang_item(cx, cx.typeck_results().expr_ty_adjusted(range), LangItem::RangeFull)
{
let (expr_ty, expr_ref_count) = peel_middle_ty_refs(cx.typeck_results().expr_ty(expr));
let (indexed_ty, indexed_ref_count) = peel_middle_ty_refs(cx.typeck_results().expr_ty(indexed));
let (expr_ty, expr_ref_count, _) = peel_and_count_ty_refs(cx.typeck_results().expr_ty(expr));
let (indexed_ty, indexed_ref_count, _) = peel_and_count_ty_refs(cx.typeck_results().expr_ty(indexed));
let parent_expr = get_parent_expr(cx, expr);
let needs_parens_for_prefix =
parent_expr.is_some_and(|parent| cx.precedence(parent) > ExprPrecedence::Prefix);

513
clippy_lints/src/returns.rs
View file

@ -1,513 +0,0 @@
use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_hir_and_then};
use clippy_utils::source::{SpanRangeExt, snippet_with_context};
use clippy_utils::sugg::has_enclosing_paren;
use clippy_utils::visitors::for_each_expr;
use clippy_utils::{
binary_expr_needs_parentheses, fn_def_id, is_from_proc_macro, is_inside_let_else, is_res_lang_ctor,
leaks_droppable_temporary_with_limited_lifetime, path_res, path_to_local_id, span_contains_cfg,
span_find_starting_semi, sym,
};
use core::ops::ControlFlow;
use rustc_ast::MetaItemInner;
use rustc_errors::Applicability;
use rustc_hir::LangItem::ResultErr;
use rustc_hir::intravisit::FnKind;
use rustc_hir::{
Block, Body, Expr, ExprKind, FnDecl, HirId, ItemKind, LangItem, MatchSource, Node, OwnerNode, PatKind, QPath, Stmt,
StmtKind,
};
use rustc_lint::{LateContext, LateLintPass, Level, LintContext};
use rustc_middle::ty::adjustment::Adjust;
use rustc_middle::ty::{self, GenericArgKind, Ty};
use rustc_session::declare_lint_pass;
use rustc_span::def_id::LocalDefId;
use rustc_span::edition::Edition;
use rustc_span::{BytePos, Pos, Span};
use std::borrow::Cow;
use std::fmt::Display;
declare_clippy_lint! {
/// ### What it does
/// Checks for `let`-bindings, which are subsequently
/// returned.
///
/// ### Why is this bad?
/// It is just extraneous code. Remove it to make your code
/// more rusty.
///
/// ### Known problems
/// In the case of some temporaries, e.g. locks, eliding the variable binding could lead
/// to deadlocks. See [this issue](https://github.com/rust-lang/rust/issues/37612).
/// This could become relevant if the code is later changed to use the code that would have been
/// bound without first assigning it to a let-binding.
///
/// ### Example
/// ```no_run
/// fn foo() -> String {
/// let x = String::new();
/// x
/// }
/// ```
/// instead, use
/// ```no_run
/// fn foo() -> String {
/// String::new()
/// }
/// ```
#[clippy::version = "pre 1.29.0"]
pub LET_AND_RETURN,
style,
"creating a let-binding and then immediately returning it like `let x = expr; x` at the end of a block"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for return statements at the end of a block.
///
/// ### Why is this bad?
/// Removing the `return` and semicolon will make the code
/// more rusty.
///
/// ### Example
/// ```no_run
/// fn foo(x: usize) -> usize {
/// return x;
/// }
/// ```
/// simplify to
/// ```no_run
/// fn foo(x: usize) -> usize {
/// x
/// }
/// ```
#[clippy::version = "pre 1.29.0"]
pub NEEDLESS_RETURN,
// This lint requires some special handling in `check_final_expr` for `#[expect]`.
// This handling needs to be updated if the group gets changed. This should also
// be caught by tests.
style,
"using a return statement like `return expr;` where an expression would suffice"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for return statements on `Err` paired with the `?` operator.
///
/// ### Why is this bad?
/// The `return` is unnecessary.
///
/// Returns may be used to add attributes to the return expression. Return
/// statements with attributes are therefore be accepted by this lint.
///
/// ### Example
/// ```rust,ignore
/// fn foo(x: usize) -> Result<(), Box<dyn Error>> {
/// if x == 0 {
/// return Err(...)?;
/// }
/// Ok(())
/// }
/// ```
/// simplify to
/// ```rust,ignore
/// fn foo(x: usize) -> Result<(), Box<dyn Error>> {
/// if x == 0 {
/// Err(...)?;
/// }
/// Ok(())
/// }
/// ```
/// if paired with `try_err`, use instead:
/// ```rust,ignore
/// fn foo(x: usize) -> Result<(), Box<dyn Error>> {
/// if x == 0 {
/// return Err(...);
/// }
/// Ok(())
/// }
/// ```
#[clippy::version = "1.73.0"]
pub NEEDLESS_RETURN_WITH_QUESTION_MARK,
style,
"using a return statement like `return Err(expr)?;` where removing it would suffice"
}
#[derive(PartialEq, Eq)]
enum RetReplacement<'tcx> {
Empty,
Block,
Unit,
NeedsPar(Cow<'tcx, str>, Applicability),
Expr(Cow<'tcx, str>, Applicability),
}
impl RetReplacement<'_> {
fn sugg_help(&self) -> &'static str {
match self {
Self::Empty | Self::Expr(..) => "remove `return`",
Self::Block => "replace `return` with an empty block",
Self::Unit => "replace `return` with a unit value",
Self::NeedsPar(..) => "remove `return` and wrap the sequence with parentheses",
}
}
fn applicability(&self) -> Applicability {
match self {
Self::Expr(_, ap) | Self::NeedsPar(_, ap) => *ap,
_ => Applicability::MachineApplicable,
}
}
}
impl Display for RetReplacement<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Empty => write!(f, ""),
Self::Block => write!(f, "{{}}"),
Self::Unit => write!(f, "()"),
Self::NeedsPar(inner, _) => write!(f, "({inner})"),
Self::Expr(inner, _) => write!(f, "{inner}"),
}
}
}
declare_lint_pass!(Return => [LET_AND_RETURN, NEEDLESS_RETURN, NEEDLESS_RETURN_WITH_QUESTION_MARK]);
/// Checks if a return statement is "needed" in the middle of a block, or if it can be removed. This
/// is the case when the enclosing block expression is coerced to some other type, which only works
/// because of the never-ness of `return` expressions
fn stmt_needs_never_type(cx: &LateContext<'_>, stmt_hir_id: HirId) -> bool {
cx.tcx
.hir_parent_iter(stmt_hir_id)
.find_map(|(_, node)| if let Node::Expr(expr) = node { Some(expr) } else { None })
.is_some_and(|e| {
cx.typeck_results()
.expr_adjustments(e)
.iter()
.any(|adjust| adjust.target != cx.tcx.types.unit && matches!(adjust.kind, Adjust::NeverToAny))
})
}
impl<'tcx> LateLintPass<'tcx> for Return {
fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
if !stmt.span.in_external_macro(cx.sess().source_map())
&& let StmtKind::Semi(expr) = stmt.kind
&& let ExprKind::Ret(Some(ret)) = expr.kind
// return Err(...)? desugars to a match
// over a Err(...).branch()
// which breaks down to a branch call, with the callee being
// the constructor of the Err variant
&& let ExprKind::Match(maybe_cons, _, MatchSource::TryDesugar(_)) = ret.kind
&& let ExprKind::Call(_, [maybe_result_err]) = maybe_cons.kind
&& let ExprKind::Call(maybe_constr, _) = maybe_result_err.kind
&& is_res_lang_ctor(cx, path_res(cx, maybe_constr), ResultErr)
// Ensure this is not the final stmt, otherwise removing it would cause a compile error
&& let OwnerNode::Item(item) = cx.tcx.hir_owner_node(cx.tcx.hir_get_parent_item(expr.hir_id))
&& let ItemKind::Fn { body, .. } = item.kind
&& let block = cx.tcx.hir_body(body).value
&& let ExprKind::Block(block, _) = block.kind
&& !is_inside_let_else(cx.tcx, expr)
&& let [.., final_stmt] = block.stmts
&& final_stmt.hir_id != stmt.hir_id
&& !is_from_proc_macro(cx, expr)
&& !stmt_needs_never_type(cx, stmt.hir_id)
{
span_lint_and_sugg(
cx,
NEEDLESS_RETURN_WITH_QUESTION_MARK,
expr.span.until(ret.span),
"unneeded `return` statement with `?` operator",
"remove it",
String::new(),
Applicability::MachineApplicable,
);
}
}
fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'_>) {
// we need both a let-binding stmt and an expr
if let Some(retexpr) = block.expr
&& let Some(stmt) = block.stmts.iter().last()
&& let StmtKind::Let(local) = &stmt.kind
&& local.ty.is_none()
&& cx.tcx.hir_attrs(local.hir_id).is_empty()
&& let Some(initexpr) = &local.init
&& let PatKind::Binding(_, local_id, _, _) = local.pat.kind
&& path_to_local_id(retexpr, local_id)
&& (cx.sess().edition() >= Edition::Edition2024 || !last_statement_borrows(cx, initexpr))
&& !initexpr.span.in_external_macro(cx.sess().source_map())
&& !retexpr.span.in_external_macro(cx.sess().source_map())
&& !local.span.from_expansion()
&& !span_contains_cfg(cx, stmt.span.between(retexpr.span))
{
span_lint_hir_and_then(
cx,
LET_AND_RETURN,
retexpr.hir_id,
retexpr.span,
"returning the result of a `let` binding from a block",
|err| {
err.span_label(local.span, "unnecessary `let` binding");
if let Some(src) = initexpr.span.get_source_text(cx) {
let sugg = if binary_expr_needs_parentheses(initexpr) {
if has_enclosing_paren(&src) {
src.to_owned()
} else {
format!("({src})")
}
} else if !cx.typeck_results().expr_adjustments(retexpr).is_empty() {
if has_enclosing_paren(&src) {
format!("{src} as _")
} else {
format!("({src}) as _")
}
} else {
src.to_owned()
};
err.multipart_suggestion(
"return the expression directly",
vec![(local.span, String::new()), (retexpr.span, sugg)],
Applicability::MachineApplicable,
);
} else {
err.span_help(initexpr.span, "this expression can be directly returned");
}
},
);
}
}
fn check_fn(
&mut self,
cx: &LateContext<'tcx>,
kind: FnKind<'tcx>,
_: &'tcx FnDecl<'tcx>,
body: &'tcx Body<'tcx>,
sp: Span,
_: LocalDefId,
) {
if sp.from_expansion() {
return;
}
match kind {
FnKind::Closure => {
// when returning without value in closure, replace this `return`
// with an empty block to prevent invalid suggestion (see #6501)
let replacement = if let ExprKind::Ret(None) = &body.value.kind {
RetReplacement::Block
} else {
RetReplacement::Empty
};
check_final_expr(cx, body.value, vec![], replacement, None);
},
FnKind::ItemFn(..) | FnKind::Method(..) => {
check_block_return(cx, &body.value.kind, sp, vec![]);
},
}
}
}
// if `expr` is a block, check if there are needless returns in it
fn check_block_return<'tcx>(cx: &LateContext<'tcx>, expr_kind: &ExprKind<'tcx>, sp: Span, mut semi_spans: Vec<Span>) {
if let ExprKind::Block(block, _) = expr_kind {
if let Some(block_expr) = block.expr {
check_final_expr(cx, block_expr, semi_spans, RetReplacement::Empty, None);
} else if let Some(stmt) = block.stmts.iter().last() {
match stmt.kind {
StmtKind::Expr(expr) => {
check_final_expr(cx, expr, semi_spans, RetReplacement::Empty, None);
},
StmtKind::Semi(semi_expr) => {
// Remove ending semicolons and any whitespace ' ' in between.
// Without `return`, the suggestion might not compile if the semicolon is retained
if let Some(semi_span) = stmt.span.trim_start(semi_expr.span) {
let semi_span_to_remove =
span_find_starting_semi(cx.sess().source_map(), semi_span.with_hi(sp.hi()));
semi_spans.push(semi_span_to_remove);
}
check_final_expr(cx, semi_expr, semi_spans, RetReplacement::Empty, None);
},
_ => (),
}
}
}
}
fn check_final_expr<'tcx>(
cx: &LateContext<'tcx>,
expr: &'tcx Expr<'tcx>,
semi_spans: Vec<Span>, /* containing all the places where we would need to remove semicolons if finding an
* needless return */
replacement: RetReplacement<'tcx>,
match_ty_opt: Option<Ty<'_>>,
) {
let peeled_drop_expr = expr.peel_drop_temps();
match &peeled_drop_expr.kind {
// simple return is always "bad"
ExprKind::Ret(inner) => {
// check if expr return nothing
let ret_span = if inner.is_none() && replacement == RetReplacement::Empty {
extend_span_to_previous_non_ws(cx, peeled_drop_expr.span)
} else {
peeled_drop_expr.span
};
let replacement = if let Some(inner_expr) = inner {
// if desugar of `do yeet`, don't lint
if let ExprKind::Call(path_expr, [_]) = inner_expr.kind
&& let ExprKind::Path(QPath::LangItem(LangItem::TryTraitFromYeet, ..)) = path_expr.kind
{
return;
}
let mut applicability = Applicability::MachineApplicable;
let (snippet, _) = snippet_with_context(cx, inner_expr.span, ret_span.ctxt(), "..", &mut applicability);
if binary_expr_needs_parentheses(inner_expr) {
RetReplacement::NeedsPar(snippet, applicability)
} else {
RetReplacement::Expr(snippet, applicability)
}
} else {
match match_ty_opt {
Some(match_ty) => {
match match_ty.kind() {
// If the code got till here with
// tuple not getting detected before it,
// then we are sure it's going to be Unit
// type
ty::Tuple(_) => RetReplacement::Unit,
// We don't want to anything in this case
// cause we can't predict what the user would
// want here
_ => return,
}
},
None => replacement,
}
};
if inner.is_some_and(|inner| leaks_droppable_temporary_with_limited_lifetime(cx, inner)) {
return;
}
if ret_span.from_expansion() || is_from_proc_macro(cx, expr) {
return;
}
// Returns may be used to turn an expression into a statement in rustc's AST.
// This allows the addition of attributes, like `#[allow]` (See: clippy#9361)
// `#[expect(clippy::needless_return)]` needs to be handled separately to
// actually fulfill the expectation (clippy::#12998)
match cx.tcx.hir_attrs(expr.hir_id) {
[] => {},
[attr] => {
if matches!(Level::from_attr(attr), Some((Level::Expect, _)))
&& let metas = attr.meta_item_list()
&& let Some(lst) = metas
&& let [MetaItemInner::MetaItem(meta_item), ..] = lst.as_slice()
&& let [tool, lint_name] = meta_item.path.segments.as_slice()
&& tool.ident.name == sym::clippy
&& matches!(
lint_name.ident.name,
sym::needless_return | sym::style | sym::all | sym::warnings
)
{
// This is an expectation of the `needless_return` lint
} else {
return;
}
},
_ => return,
}
emit_return_lint(
cx,
peeled_drop_expr.span,
ret_span,
semi_spans,
&replacement,
expr.hir_id,
);
},
ExprKind::If(_, then, else_clause_opt) => {
check_block_return(cx, &then.kind, peeled_drop_expr.span, semi_spans.clone());
if let Some(else_clause) = else_clause_opt {
// The `RetReplacement` won't be used there as `else_clause` will be either a block or
// a `if` expression.
check_final_expr(cx, else_clause, semi_spans, RetReplacement::Empty, match_ty_opt);
}
},
// a match expr, check all arms
// an if/if let expr, check both exprs
// note, if without else is going to be a type checking error anyways
// (except for unit type functions) so we don't match it
ExprKind::Match(_, arms, MatchSource::Normal) => {
let match_ty = cx.typeck_results().expr_ty(peeled_drop_expr);
for arm in *arms {
check_final_expr(cx, arm.body, semi_spans.clone(), RetReplacement::Unit, Some(match_ty));
}
},
// if it's a whole block, check it
other_expr_kind => check_block_return(cx, other_expr_kind, peeled_drop_expr.span, semi_spans),
}
}
fn emit_return_lint(
cx: &LateContext<'_>,
lint_span: Span,
ret_span: Span,
semi_spans: Vec<Span>,
replacement: &RetReplacement<'_>,
at: HirId,
) {
span_lint_hir_and_then(
cx,
NEEDLESS_RETURN,
at,
lint_span,
"unneeded `return` statement",
|diag| {
let suggestions = std::iter::once((ret_span, replacement.to_string()))
.chain(semi_spans.into_iter().map(|span| (span, String::new())))
.collect();
diag.multipart_suggestion_verbose(replacement.sugg_help(), suggestions, replacement.applicability());
},
);
}
fn last_statement_borrows<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
for_each_expr(cx, expr, |e| {
if let Some(def_id) = fn_def_id(cx, e)
&& cx
.tcx
.fn_sig(def_id)
.instantiate_identity()
.skip_binder()
.output()
.walk()
.any(|arg| matches!(arg.kind(), GenericArgKind::Lifetime(re) if !re.is_static()))
{
ControlFlow::Break(())
} else {
ControlFlow::Continue(())
}
})
.is_some()
}
// Go backwards while encountering whitespace and extend the given Span to that point.
fn extend_span_to_previous_non_ws(cx: &LateContext<'_>, sp: Span) -> Span {
if let Ok(prev_source) = cx.sess().source_map().span_to_prev_source(sp) {
let ws = [b' ', b'\t', b'\n'];
if let Some(non_ws_pos) = prev_source.bytes().rposition(|c| !ws.contains(&c)) {
let len = prev_source.len() - non_ws_pos - 1;
return sp.with_lo(sp.lo() - BytePos::from_usize(len));
}
}
sp
}

86
clippy_lints/src/returns/let_and_return.rs Normal file
View file

@ -0,0 +1,86 @@
use clippy_utils::diagnostics::span_lint_hir_and_then;
use clippy_utils::source::SpanRangeExt;
use clippy_utils::sugg::has_enclosing_paren;
use clippy_utils::visitors::for_each_expr;
use clippy_utils::{binary_expr_needs_parentheses, fn_def_id, path_to_local_id, span_contains_cfg};
use core::ops::ControlFlow;
use rustc_errors::Applicability;
use rustc_hir::{Block, Expr, PatKind, StmtKind};
use rustc_lint::{LateContext, LintContext};
use rustc_middle::ty::GenericArgKind;
use rustc_span::edition::Edition;
use super::LET_AND_RETURN;
pub(super) fn check_block<'tcx>(cx: &LateContext<'tcx>, block: &'tcx Block<'_>) {
// we need both a let-binding stmt and an expr
if let Some(retexpr) = block.expr
&& let Some(stmt) = block.stmts.last()
&& let StmtKind::Let(local) = &stmt.kind
&& local.ty.is_none()
&& cx.tcx.hir_attrs(local.hir_id).is_empty()
&& let Some(initexpr) = &local.init
&& let PatKind::Binding(_, local_id, _, _) = local.pat.kind
&& path_to_local_id(retexpr, local_id)
&& (cx.sess().edition() >= Edition::Edition2024 || !last_statement_borrows(cx, initexpr))
&& !initexpr.span.in_external_macro(cx.sess().source_map())
&& !retexpr.span.in_external_macro(cx.sess().source_map())
&& !local.span.from_expansion()
&& !span_contains_cfg(cx, stmt.span.between(retexpr.span))
{
span_lint_hir_and_then(
cx,
LET_AND_RETURN,
retexpr.hir_id,
retexpr.span,
"returning the result of a `let` binding from a block",
|err| {
err.span_label(local.span, "unnecessary `let` binding");
if let Some(src) = initexpr.span.get_source_text(cx) {
let sugg = if binary_expr_needs_parentheses(initexpr) {
if has_enclosing_paren(&src) {
src.to_owned()
} else {
format!("({src})")
}
} else if !cx.typeck_results().expr_adjustments(retexpr).is_empty() {
if has_enclosing_paren(&src) {
format!("{src} as _")
} else {
format!("({src}) as _")
}
} else {
src.to_owned()
};
err.multipart_suggestion(
"return the expression directly",
vec![(local.span, String::new()), (retexpr.span, sugg)],
Applicability::MachineApplicable,
);
} else {
err.span_help(initexpr.span, "this expression can be directly returned");
}
},
);
}
}
fn last_statement_borrows<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -> bool {
for_each_expr(cx, expr, |e| {
if let Some(def_id) = fn_def_id(cx, e)
&& cx
.tcx
.fn_sig(def_id)
.instantiate_identity()
.skip_binder()
.output()
.walk()
.any(|arg| matches!(arg.kind(), GenericArgKind::Lifetime(re) if !re.is_static()))
{
ControlFlow::Break(())
} else {
ControlFlow::Continue(())
}
})
.is_some()
}

140
clippy_lints/src/returns/mod.rs Normal file
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@ -0,0 +1,140 @@
use rustc_hir::intravisit::FnKind;
use rustc_hir::{Block, Body, FnDecl, Stmt};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::declare_lint_pass;
use rustc_span::Span;
use rustc_span::def_id::LocalDefId;
mod let_and_return;
mod needless_return;
mod needless_return_with_question_mark;
declare_clippy_lint! {
/// ### What it does
/// Checks for `let`-bindings, which are subsequently
/// returned.
///
/// ### Why is this bad?
/// It is just extraneous code. Remove it to make your code
/// more rusty.
///
/// ### Known problems
/// In the case of some temporaries, e.g. locks, eliding the variable binding could lead
/// to deadlocks. See [this issue](https://github.com/rust-lang/rust/issues/37612).
/// This could become relevant if the code is later changed to use the code that would have been
/// bound without first assigning it to a let-binding.
///
/// ### Example
/// ```no_run
/// fn foo() -> String {
/// let x = String::new();
/// x
/// }
/// ```
/// instead, use
/// ```no_run
/// fn foo() -> String {
/// String::new()
/// }
/// ```
#[clippy::version = "pre 1.29.0"]
pub LET_AND_RETURN,
style,
"creating a let-binding and then immediately returning it like `let x = expr; x` at the end of a block"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for return statements at the end of a block.
///
/// ### Why is this bad?
/// Removing the `return` and semicolon will make the code
/// more rusty.
///
/// ### Example
/// ```no_run
/// fn foo(x: usize) -> usize {
/// return x;
/// }
/// ```
/// simplify to
/// ```no_run
/// fn foo(x: usize) -> usize {
/// x
/// }
/// ```
#[clippy::version = "pre 1.29.0"]
pub NEEDLESS_RETURN,
// This lint requires some special handling in `check_final_expr` for `#[expect]`.
// This handling needs to be updated if the group gets changed. This should also
// be caught by tests.
style,
"using a return statement like `return expr;` where an expression would suffice"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for return statements on `Err` paired with the `?` operator.
///
/// ### Why is this bad?
/// The `return` is unnecessary.
///
/// Returns may be used to add attributes to the return expression. Return
/// statements with attributes are therefore be accepted by this lint.
///
/// ### Example
/// ```rust,ignore
/// fn foo(x: usize) -> Result<(), Box<dyn Error>> {
/// if x == 0 {
/// return Err(...)?;
/// }
/// Ok(())
/// }
/// ```
/// simplify to
/// ```rust,ignore
/// fn foo(x: usize) -> Result<(), Box<dyn Error>> {
/// if x == 0 {
/// Err(...)?;
/// }
/// Ok(())
/// }
/// ```
/// if paired with `try_err`, use instead:
/// ```rust,ignore
/// fn foo(x: usize) -> Result<(), Box<dyn Error>> {
/// if x == 0 {
/// return Err(...);
/// }
/// Ok(())
/// }
/// ```
#[clippy::version = "1.73.0"]
pub NEEDLESS_RETURN_WITH_QUESTION_MARK,
style,
"using a return statement like `return Err(expr)?;` where removing it would suffice"
}
declare_lint_pass!(Return => [LET_AND_RETURN, NEEDLESS_RETURN, NEEDLESS_RETURN_WITH_QUESTION_MARK]);
impl<'tcx> LateLintPass<'tcx> for Return {
fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
needless_return_with_question_mark::check_stmt(cx, stmt);
}
fn check_block(&mut self, cx: &LateContext<'tcx>, block: &'tcx Block<'_>) {
let_and_return::check_block(cx, block);
}
fn check_fn(
&mut self,
cx: &LateContext<'tcx>,
kind: FnKind<'tcx>,
_: &'tcx FnDecl<'tcx>,
body: &'tcx Body<'tcx>,
sp: Span,
_: LocalDefId,
) {
needless_return::check_fn(cx, kind, body, sp);
}
}

269
clippy_lints/src/returns/needless_return.rs Normal file
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@ -0,0 +1,269 @@
use clippy_utils::diagnostics::span_lint_hir_and_then;
use clippy_utils::source::snippet_with_context;
use clippy_utils::{
binary_expr_needs_parentheses, is_from_proc_macro, leaks_droppable_temporary_with_limited_lifetime,
span_contains_cfg, span_find_starting_semi, sym,
};
use rustc_ast::MetaItemInner;
use rustc_errors::Applicability;
use rustc_hir::intravisit::FnKind;
use rustc_hir::{Body, Expr, ExprKind, HirId, LangItem, MatchSource, QPath, StmtKind};
use rustc_lint::{LateContext, Level, LintContext};
use rustc_middle::ty::{self, Ty};
use rustc_span::{BytePos, Pos, Span};
use std::borrow::Cow;
use std::fmt::Display;
use super::NEEDLESS_RETURN;
#[derive(PartialEq, Eq)]
enum RetReplacement<'tcx> {
Empty,
Block,
Unit,
NeedsPar(Cow<'tcx, str>, Applicability),
Expr(Cow<'tcx, str>, Applicability),
}
impl RetReplacement<'_> {
fn sugg_help(&self) -> &'static str {
match self {
Self::Empty | Self::Expr(..) => "remove `return`",
Self::Block => "replace `return` with an empty block",
Self::Unit => "replace `return` with a unit value",
Self::NeedsPar(..) => "remove `return` and wrap the sequence with parentheses",
}
}
fn applicability(&self) -> Applicability {
match self {
Self::Expr(_, ap) | Self::NeedsPar(_, ap) => *ap,
_ => Applicability::MachineApplicable,
}
}
}
impl Display for RetReplacement<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Empty => f.write_str(""),
Self::Block => f.write_str("{}"),
Self::Unit => f.write_str("()"),
Self::NeedsPar(inner, _) => write!(f, "({inner})"),
Self::Expr(inner, _) => write!(f, "{inner}"),
}
}
}
pub(super) fn check_fn<'tcx>(cx: &LateContext<'tcx>, kind: FnKind<'tcx>, body: &'tcx Body<'tcx>, sp: Span) {
if sp.from_expansion() {
return;
}
match kind {
FnKind::Closure => {
// when returning without value in closure, replace this `return`
// with an empty block to prevent invalid suggestion (see #6501)
let replacement = if let ExprKind::Ret(None) = &body.value.kind {
RetReplacement::Block
} else {
RetReplacement::Empty
};
check_final_expr(cx, body.value, vec![], replacement, None);
},
FnKind::ItemFn(..) | FnKind::Method(..) => {
check_block_return(cx, &body.value.kind, sp, vec![]);
},
}
}
// if `expr` is a block, check if there are needless returns in it
fn check_block_return<'tcx>(cx: &LateContext<'tcx>, expr_kind: &ExprKind<'tcx>, sp: Span, mut semi_spans: Vec<Span>) {
if let ExprKind::Block(block, _) = expr_kind {
if let Some(block_expr) = block.expr {
check_final_expr(cx, block_expr, semi_spans, RetReplacement::Empty, None);
} else if let Some(stmt) = block.stmts.last() {
if span_contains_cfg(
cx,
Span::between(
stmt.span,
cx.sess().source_map().end_point(block.span), // the closing brace of the block
),
) {
return;
}
match stmt.kind {
StmtKind::Expr(expr) => {
check_final_expr(cx, expr, semi_spans, RetReplacement::Empty, None);
},
StmtKind::Semi(semi_expr) => {
// Remove ending semicolons and any whitespace ' ' in between.
// Without `return`, the suggestion might not compile if the semicolon is retained
if let Some(semi_span) = stmt.span.trim_start(semi_expr.span) {
let semi_span_to_remove =
span_find_starting_semi(cx.sess().source_map(), semi_span.with_hi(sp.hi()));
semi_spans.push(semi_span_to_remove);
}
check_final_expr(cx, semi_expr, semi_spans, RetReplacement::Empty, None);
},
_ => (),
}
}
}
}
fn check_final_expr<'tcx>(
cx: &LateContext<'tcx>,
expr: &'tcx Expr<'tcx>,
semi_spans: Vec<Span>, /* containing all the places where we would need to remove semicolons if finding an
* needless return */
replacement: RetReplacement<'tcx>,
match_ty_opt: Option<Ty<'_>>,
) {
let peeled_drop_expr = expr.peel_drop_temps();
match &peeled_drop_expr.kind {
// simple return is always "bad"
ExprKind::Ret(inner) => {
// check if expr return nothing
let ret_span = if inner.is_none() && replacement == RetReplacement::Empty {
extend_span_to_previous_non_ws(cx, peeled_drop_expr.span)
} else {
peeled_drop_expr.span
};
let replacement = if let Some(inner_expr) = inner {
// if desugar of `do yeet`, don't lint
if let ExprKind::Call(path_expr, [_]) = inner_expr.kind
&& let ExprKind::Path(QPath::LangItem(LangItem::TryTraitFromYeet, ..)) = path_expr.kind
{
return;
}
let mut applicability = Applicability::MachineApplicable;
let (snippet, _) = snippet_with_context(cx, inner_expr.span, ret_span.ctxt(), "..", &mut applicability);
if binary_expr_needs_parentheses(inner_expr) {
RetReplacement::NeedsPar(snippet, applicability)
} else {
RetReplacement::Expr(snippet, applicability)
}
} else {
match match_ty_opt {
Some(match_ty) => {
match match_ty.kind() {
// If the code got till here with
// tuple not getting detected before it,
// then we are sure it's going to be Unit
// type
ty::Tuple(_) => RetReplacement::Unit,
// We don't want to anything in this case
// cause we can't predict what the user would
// want here
_ => return,
}
},
None => replacement,
}
};
if inner.is_some_and(|inner| leaks_droppable_temporary_with_limited_lifetime(cx, inner)) {
return;
}
if ret_span.from_expansion() || is_from_proc_macro(cx, expr) {
return;
}
// Returns may be used to turn an expression into a statement in rustc's AST.
// This allows the addition of attributes, like `#[allow]` (See: clippy#9361)
// `#[expect(clippy::needless_return)]` needs to be handled separately to
// actually fulfill the expectation (clippy::#12998)
match cx.tcx.hir_attrs(expr.hir_id) {
[] => {},
[attr] => {
if matches!(Level::from_attr(attr), Some((Level::Expect, _)))
&& let metas = attr.meta_item_list()
&& let Some(lst) = metas
&& let [MetaItemInner::MetaItem(meta_item), ..] = lst.as_slice()
&& let [tool, lint_name] = meta_item.path.segments.as_slice()
&& tool.ident.name == sym::clippy
&& matches!(
lint_name.ident.name,
sym::needless_return | sym::style | sym::all | sym::warnings
)
{
// This is an expectation of the `needless_return` lint
} else {
return;
}
},
_ => return,
}
emit_return_lint(
cx,
peeled_drop_expr.span,
ret_span,
semi_spans,
&replacement,
expr.hir_id,
);
},
ExprKind::If(_, then, else_clause_opt) => {
check_block_return(cx, &then.kind, peeled_drop_expr.span, semi_spans.clone());
if let Some(else_clause) = else_clause_opt {
// The `RetReplacement` won't be used there as `else_clause` will be either a block or
// a `if` expression.
check_final_expr(cx, else_clause, semi_spans, RetReplacement::Empty, match_ty_opt);
}
},
// a match expr, check all arms
// an if/if let expr, check both exprs
// note, if without else is going to be a type checking error anyways
// (except for unit type functions) so we don't match it
ExprKind::Match(_, arms, MatchSource::Normal) => {
let match_ty = cx.typeck_results().expr_ty(peeled_drop_expr);
for arm in *arms {
check_final_expr(cx, arm.body, semi_spans.clone(), RetReplacement::Unit, Some(match_ty));
}
},
// if it's a whole block, check it
other_expr_kind => check_block_return(cx, other_expr_kind, peeled_drop_expr.span, semi_spans),
}
}
fn emit_return_lint(
cx: &LateContext<'_>,
lint_span: Span,
ret_span: Span,
semi_spans: Vec<Span>,
replacement: &RetReplacement<'_>,
at: HirId,
) {
span_lint_hir_and_then(
cx,
NEEDLESS_RETURN,
at,
lint_span,
"unneeded `return` statement",
|diag| {
let suggestions = std::iter::once((ret_span, replacement.to_string()))
.chain(semi_spans.into_iter().map(|span| (span, String::new())))
.collect();
diag.multipart_suggestion_verbose(replacement.sugg_help(), suggestions, replacement.applicability());
},
);
}
// Go backwards while encountering whitespace and extend the given Span to that point.
fn extend_span_to_previous_non_ws(cx: &LateContext<'_>, sp: Span) -> Span {
if let Ok(prev_source) = cx.sess().source_map().span_to_prev_source(sp) {
let ws = [b' ', b'\t', b'\n'];
if let Some(non_ws_pos) = prev_source.bytes().rposition(|c| !ws.contains(&c)) {
let len = prev_source.len() - non_ws_pos - 1;
return sp.with_lo(sp.lo() - BytePos::from_usize(len));
}
}
sp
}

60
clippy_lints/src/returns/needless_return_with_question_mark.rs Normal file
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@ -0,0 +1,60 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::{is_from_proc_macro, is_inside_let_else, is_res_lang_ctor, path_res};
use rustc_errors::Applicability;
use rustc_hir::LangItem::ResultErr;
use rustc_hir::{ExprKind, HirId, ItemKind, MatchSource, Node, OwnerNode, Stmt, StmtKind};
use rustc_lint::{LateContext, LintContext};
use rustc_middle::ty::adjustment::Adjust;
use super::NEEDLESS_RETURN_WITH_QUESTION_MARK;
pub(super) fn check_stmt<'tcx>(cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
if !stmt.span.in_external_macro(cx.sess().source_map())
&& let StmtKind::Semi(expr) = stmt.kind
&& let ExprKind::Ret(Some(ret)) = expr.kind
// return Err(...)? desugars to a match
// over a Err(...).branch()
// which breaks down to a branch call, with the callee being
// the constructor of the Err variant
&& let ExprKind::Match(maybe_cons, _, MatchSource::TryDesugar(_)) = ret.kind
&& let ExprKind::Call(_, [maybe_result_err]) = maybe_cons.kind
&& let ExprKind::Call(maybe_constr, _) = maybe_result_err.kind
&& is_res_lang_ctor(cx, path_res(cx, maybe_constr), ResultErr)
// Ensure this is not the final stmt, otherwise removing it would cause a compile error
&& let OwnerNode::Item(item) = cx.tcx.hir_owner_node(cx.tcx.hir_get_parent_item(expr.hir_id))
&& let ItemKind::Fn { body, .. } = item.kind
&& let block = cx.tcx.hir_body(body).value
&& let ExprKind::Block(block, _) = block.kind
&& !is_inside_let_else(cx.tcx, expr)
&& let [.., final_stmt] = block.stmts
&& final_stmt.hir_id != stmt.hir_id
&& !is_from_proc_macro(cx, expr)
&& !stmt_needs_never_type(cx, stmt.hir_id)
{
span_lint_and_sugg(
cx,
NEEDLESS_RETURN_WITH_QUESTION_MARK,
expr.span.until(ret.span),
"unneeded `return` statement with `?` operator",
"remove it",
String::new(),
Applicability::MachineApplicable,
);
}
}
/// Checks if a return statement is "needed" in the middle of a block, or if it can be removed.
/// This is the case when the enclosing block expression is coerced to some other type,
/// which only works because of the never-ness of `return` expressions
fn stmt_needs_never_type(cx: &LateContext<'_>, stmt_hir_id: HirId) -> bool {
cx.tcx
.hir_parent_iter(stmt_hir_id)
.find_map(|(_, node)| if let Node::Expr(expr) = node { Some(expr) } else { None })
.is_some_and(|e| {
cx.typeck_results()
.expr_adjustments(e)
.iter()
.any(|adjust| adjust.target != cx.tcx.types.unit && matches!(adjust.kind, Adjust::NeverToAny))
})
}

14
clippy_lints/src/semicolon_block.rs
View file

@ -1,5 +1,6 @@
use clippy_config::Conf;
use clippy_utils::diagnostics::span_lint_and_then;
use clippy_utils::source::SpanRangeExt;
use rustc_errors::Applicability;
use rustc_hir::{Block, Expr, ExprKind, Stmt, StmtKind};
use rustc_lint::{LateContext, LateLintPass, LintContext};
@ -82,6 +83,19 @@ impl SemicolonBlock {
let insert_span = tail.span.source_callsite().shrink_to_hi();
let remove_span = semi_span.with_lo(block.span.hi());
// If the block is surrounded by parens (`({ 0 });`), the author probably knows what
// they're doing and why, so don't get in their way.
//
// This has the additional benefit of stopping the block being parsed as a function call:
// ```
// fn foo() {
// ({ 0 }); // if we remove this `;`, this will parse as a `({ 0 })(5);` function call
// (5);
// }
if remove_span.check_source_text(cx, |src| src.contains(')')) {
return;
}
if self.semicolon_inside_block_ignore_singleline && get_line(cx, remove_span) == get_line(cx, insert_span) {
return;
}

5
clippy_lints/src/size_of_ref.rs
View file

@ -1,5 +1,6 @@
use clippy_utils::diagnostics::span_lint_and_help;
use clippy_utils::{path_def_id, peel_middle_ty_refs};
use clippy_utils::path_def_id;
use clippy_utils::ty::peel_and_count_ty_refs;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::declare_lint_pass;
@ -59,7 +60,7 @@ impl LateLintPass<'_> for SizeOfRef {
&& let Some(def_id) = path_def_id(cx, path)
&& cx.tcx.is_diagnostic_item(sym::mem_size_of_val, def_id)
&& let arg_ty = cx.typeck_results().expr_ty(arg)
&& peel_middle_ty_refs(arg_ty).1 > 1
&& peel_and_count_ty_refs(arg_ty).1 > 1
{
span_lint_and_help(
cx,

119
clippy_lints/src/toplevel_ref_arg.rs Normal file
View file

@ -0,0 +1,119 @@
use clippy_utils::diagnostics::{span_lint_hir, span_lint_hir_and_then};
use clippy_utils::source::{snippet, snippet_with_context};
use clippy_utils::sugg::Sugg;
use clippy_utils::{is_lint_allowed, iter_input_pats};
use rustc_errors::Applicability;
use rustc_hir::intravisit::FnKind;
use rustc_hir::{BindingMode, Body, ByRef, FnDecl, Mutability, PatKind, Stmt, StmtKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::declare_lint_pass;
use rustc_span::Span;
use rustc_span::def_id::LocalDefId;
use crate::ref_patterns::REF_PATTERNS;
declare_clippy_lint! {
/// ### What it does
/// Checks for function arguments and let bindings denoted as
/// `ref`.
///
/// ### Why is this bad?
/// The `ref` declaration makes the function take an owned
/// value, but turns the argument into a reference (which means that the value
/// is destroyed when exiting the function). This adds not much value: either
/// take a reference type, or take an owned value and create references in the
/// body.
///
/// For let bindings, `let x = &foo;` is preferred over `let ref x = foo`. The
/// type of `x` is more obvious with the former.
///
/// ### Known problems
/// If the argument is dereferenced within the function,
/// removing the `ref` will lead to errors. This can be fixed by removing the
/// dereferences, e.g., changing `*x` to `x` within the function.
///
/// ### Example
/// ```no_run
/// fn foo(ref _x: u8) {}
/// ```
///
/// Use instead:
/// ```no_run
/// fn foo(_x: &u8) {}
/// ```
#[clippy::version = "pre 1.29.0"]
pub TOPLEVEL_REF_ARG,
style,
"an entire binding declared as `ref`, in a function argument or a `let` statement"
}
declare_lint_pass!(ToplevelRefArg => [TOPLEVEL_REF_ARG]);
impl<'tcx> LateLintPass<'tcx> for ToplevelRefArg {
fn check_fn(
&mut self,
cx: &LateContext<'tcx>,
k: FnKind<'tcx>,
decl: &'tcx FnDecl<'_>,
body: &'tcx Body<'_>,
_: Span,
_: LocalDefId,
) {
if !matches!(k, FnKind::Closure) {
for arg in iter_input_pats(decl, body) {
if let PatKind::Binding(BindingMode(ByRef::Yes(_), _), ..) = arg.pat.kind
&& is_lint_allowed(cx, REF_PATTERNS, arg.pat.hir_id)
&& !arg.span.in_external_macro(cx.tcx.sess.source_map())
{
span_lint_hir(
cx,
TOPLEVEL_REF_ARG,
arg.hir_id,
arg.pat.span,
"`ref` directly on a function parameter does not prevent taking ownership of the passed argument. \
Consider using a reference type instead",
);
}
}
}
}
fn check_stmt(&mut self, cx: &LateContext<'tcx>, stmt: &'tcx Stmt<'_>) {
if let StmtKind::Let(local) = stmt.kind
&& let PatKind::Binding(BindingMode(ByRef::Yes(mutabl), _), .., name, None) = local.pat.kind
&& let Some(init) = local.init
// Do not emit if clippy::ref_patterns is not allowed to avoid having two lints for the same issue.
&& is_lint_allowed(cx, REF_PATTERNS, local.pat.hir_id)
&& !stmt.span.in_external_macro(cx.tcx.sess.source_map())
{
let ctxt = local.span.ctxt();
let mut app = Applicability::MachineApplicable;
let sugg_init = Sugg::hir_with_context(cx, init, ctxt, "..", &mut app);
let (mutopt, initref) = match mutabl {
Mutability::Mut => ("mut ", sugg_init.mut_addr()),
Mutability::Not => ("", sugg_init.addr()),
};
let tyopt = if let Some(ty) = local.ty {
let ty_snip = snippet_with_context(cx, ty.span, ctxt, "_", &mut app).0;
format!(": &{mutopt}{ty_snip}")
} else {
String::new()
};
span_lint_hir_and_then(
cx,
TOPLEVEL_REF_ARG,
init.hir_id,
local.pat.span,
"`ref` on an entire `let` pattern is discouraged, take a reference with `&` instead",
|diag| {
diag.span_suggestion(
stmt.span,
"try",
format!("let {name}{tyopt} = {initref};", name = snippet(cx, name.span, ".."),),
app,
);
},
);
}
}
}

44
clippy_lints/src/transmute/transmute_ptr_to_ref.rs
View file

@ -28,16 +28,27 @@ pub(super) fn check<'tcx>(
format!("transmute from a pointer type (`{from_ty}`) to a reference type (`{to_ty}`)"),
|diag| {
let arg = sugg::Sugg::hir(cx, arg, "..");
let (deref, cast) = if *mutbl == Mutability::Mut {
("&mut *", "*mut")
} else {
("&*", "*const")
let (deref, cast) = match mutbl {
Mutability::Mut => ("&mut *", "*mut"),
Mutability::Not => ("&*", "*const"),
};
let mut app = Applicability::MachineApplicable;
let sugg = if let Some(ty) = get_explicit_type(path) {
let ty_snip = snippet_with_applicability(cx, ty.span, "..", &mut app);
if msrv.meets(cx, msrvs::POINTER_CAST) {
if !to_ref_ty.is_sized(cx.tcx, cx.typing_env()) {
// We can't suggest `.cast()`, because that requires `to_ref_ty` to be Sized.
if from_ptr_ty.has_erased_regions() {
// We can't suggest `as *mut/const () as *mut/const to_ref_ty`, because the former is a
// thin pointer, whereas the latter is a wide pointer, due of its pointee, `to_ref_ty`,
// being !Sized.
//
// The only remaining option is be to skip `*mut/const ()`, but that might not be safe
// to do because of the erased regions in `from_ptr_ty`, so reduce the applicability.
app = Applicability::MaybeIncorrect;
}
sugg::make_unop(deref, arg.as_ty(format!("{cast} {ty_snip}"))).to_string()
} else if msrv.meets(cx, msrvs::POINTER_CAST) {
format!("{deref}{}.cast::<{ty_snip}>()", arg.maybe_paren())
} else if from_ptr_ty.has_erased_regions() {
sugg::make_unop(deref, arg.as_ty(format!("{cast} () as {cast} {ty_snip}"))).to_string()
@ -45,15 +56,22 @@ pub(super) fn check<'tcx>(
sugg::make_unop(deref, arg.as_ty(format!("{cast} {ty_snip}"))).to_string()
}
} else if *from_ptr_ty == *to_ref_ty {
if from_ptr_ty.has_erased_regions() {
if msrv.meets(cx, msrvs::POINTER_CAST) {
format!("{deref}{}.cast::<{to_ref_ty}>()", arg.maybe_paren())
} else {
sugg::make_unop(deref, arg.as_ty(format!("{cast} () as {cast} {to_ref_ty}")))
.to_string()
}
} else {
if !from_ptr_ty.has_erased_regions() {
sugg::make_unop(deref, arg).to_string()
} else if !to_ref_ty.is_sized(cx.tcx, cx.typing_env()) {
// 1. We can't suggest `.cast()`, because that requires `to_ref_ty` to be Sized.
// 2. We can't suggest `as *mut/const () as *mut/const to_ref_ty`, because the former is a
// thin pointer, whereas the latter is a wide pointer, due of its pointee, `to_ref_ty`,
// being !Sized.
//
// The only remaining option is be to skip `*mut/const ()`, but that might not be safe to do
// because of the erased regions in `from_ptr_ty`, so reduce the applicability.
app = Applicability::MaybeIncorrect;
sugg::make_unop(deref, arg.as_ty(format!("{cast} {to_ref_ty}"))).to_string()
} else if msrv.meets(cx, msrvs::POINTER_CAST) {
format!("{deref}{}.cast::<{to_ref_ty}>()", arg.maybe_paren())
} else {
sugg::make_unop(deref, arg.as_ty(format!("{cast} () as {cast} {to_ref_ty}"))).to_string()
}
} else {
sugg::make_unop(deref, arg.as_ty(format!("{cast} {to_ref_ty}"))).to_string()

4
clippy_lints/src/transmute/transmute_ref_to_ref.rs
View file

@ -45,7 +45,9 @@ pub(super) fn check<'tcx>(
Applicability::MaybeIncorrect,
);
triggered = true;
} else if (cx.tcx.erase_and_anonymize_regions(from_ty) != cx.tcx.erase_and_anonymize_regions(to_ty)) && !const_context {
} else if (cx.tcx.erase_and_anonymize_regions(from_ty) != cx.tcx.erase_and_anonymize_regions(to_ty))
&& !const_context
{
span_lint_and_then(
cx,
TRANSMUTE_PTR_TO_PTR,

11
clippy_lints/src/uninit_vec.rs
View file

@ -1,4 +1,4 @@
use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
use clippy_utils::higher::{VecInitKind, get_vec_init_kind};
use clippy_utils::ty::{is_type_diagnostic_item, is_uninit_value_valid_for_ty};
use clippy_utils::{SpanlessEq, is_integer_literal, is_lint_allowed, path_to_local_id, peel_hir_expr_while, sym};
@ -95,16 +95,13 @@ fn handle_uninit_vec_pair<'tcx>(
// Check T of Vec<T>
if !is_uninit_value_valid_for_ty(cx, args.type_at(0)) {
// FIXME: #7698, false positive of the internal lints
#[expect(clippy::collapsible_span_lint_calls)]
span_lint_and_then(
span_lint_and_help(
cx,
UNINIT_VEC,
vec![call_span, maybe_init_or_reserve.span],
"calling `set_len()` immediately after reserving a buffer creates uninitialized values",
|diag| {
diag.help("initialize the buffer or wrap the content in `MaybeUninit`");
},
None,
"initialize the buffer or wrap the content in `MaybeUninit`",
);
}
} else {

6
clippy_lints/src/unused_peekable.rs
View file

@ -1,5 +1,5 @@
use clippy_utils::diagnostics::span_lint_hir_and_then;
use clippy_utils::ty::{is_type_diagnostic_item, peel_mid_ty_refs_is_mutable};
use clippy_utils::ty::{is_type_diagnostic_item, peel_and_count_ty_refs};
use clippy_utils::{fn_def_id, is_trait_method, path_to_local_id, peel_ref_operators, sym};
use rustc_ast::Mutability;
use rustc_hir::intravisit::{Visitor, walk_expr};
@ -61,7 +61,7 @@ impl<'tcx> LateLintPass<'tcx> for UnusedPeekable {
&& let Some(init) = local.init
&& !init.span.from_expansion()
&& let Some(ty) = cx.typeck_results().expr_ty_opt(init)
&& let (ty, _, Mutability::Mut) = peel_mid_ty_refs_is_mutable(ty)
&& let (ty, _, None | Some(Mutability::Mut)) = peel_and_count_ty_refs(ty)
&& is_type_diagnostic_item(cx, ty, sym::IterPeekable)
{
let mut vis = PeekableVisitor::new(cx, binding);
@ -211,7 +211,7 @@ impl<'tcx> Visitor<'tcx> for PeekableVisitor<'_, 'tcx> {
fn arg_is_mut_peekable(cx: &LateContext<'_>, arg: &Expr<'_>) -> bool {
if let Some(ty) = cx.typeck_results().expr_ty_opt(arg)
&& let (ty, _, Mutability::Mut) = peel_mid_ty_refs_is_mutable(ty)
&& let (ty, _, None | Some(Mutability::Mut)) = peel_and_count_ty_refs(ty)
&& is_type_diagnostic_item(cx, ty, sym::IterPeekable)
{
true

1
clippy_lints/src/unwrap.rs
View file

@ -292,6 +292,7 @@ impl<'tcx> Visitor<'tcx> for UnwrappableVariablesVisitor<'_, 'tcx> {
fn visit_expr(&mut self, expr: &'tcx Expr<'_>) {
// Shouldn't lint when `expr` is in macro.
if expr.span.in_external_macro(self.cx.tcx.sess.source_map()) {
walk_expr(self, expr);
return;
}
// Skip checking inside closures since they are visited through `Unwrap::check_fn()` already.

81
clippy_lints/src/use_self.rs
View file

@ -2,20 +2,21 @@ use clippy_config::Conf;
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::is_from_proc_macro;
use clippy_utils::msrvs::{self, Msrv};
use clippy_utils::ty::{same_type_and_consts, ty_from_hir_ty};
use clippy_utils::ty::{same_type_modulo_regions, ty_from_hir_ty};
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::Applicability;
use rustc_hir::def::{CtorOf, DefKind, Res};
use rustc_hir::def_id::LocalDefId;
use rustc_hir::intravisit::{InferKind, Visitor, VisitorExt, walk_ty};
use rustc_hir::{
self as hir, AmbigArg, Expr, ExprKind, FnRetTy, FnSig, GenericArgsParentheses, GenericParam, GenericParamKind,
HirId, Impl, ImplItemKind, Item, ItemKind, Pat, PatExpr, PatExprKind, PatKind, Path, QPath, Ty, TyKind,
self as hir, AmbigArg, Expr, ExprKind, FnRetTy, FnSig, GenericArgsParentheses, GenericParamKind, HirId, Impl,
ImplItemKind, Item, ItemKind, Pat, PatExpr, PatExprKind, PatKind, Path, QPath, Ty, TyKind,
};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty::Ty as MiddleTy;
use rustc_session::impl_lint_pass;
use rustc_span::Span;
use std::iter;
declare_clippy_lint! {
/// ### What it does
@ -101,17 +102,11 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf {
let types_to_skip = generics
.params
.iter()
.filter_map(|param| match param {
GenericParam {
kind:
GenericParamKind::Const {
ty: Ty { hir_id, .. }, ..
},
..
} => Some(*hir_id),
.filter_map(|param| match param.kind {
GenericParamKind::Const { ty, .. } => Some(ty.hir_id),
_ => None,
})
.chain(std::iter::once(self_ty.hir_id))
.chain([self_ty.hir_id])
.collect();
StackItem::Check {
impl_id: item.owner_id.def_id,
@ -209,11 +204,11 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf {
&& !types_to_skip.contains(&hir_ty.hir_id)
&& let ty = ty_from_hir_ty(cx, hir_ty.as_unambig_ty())
&& let impl_ty = cx.tcx.type_of(impl_id).instantiate_identity()
&& same_type_and_consts(ty, impl_ty)
&& same_type_modulo_regions(ty, impl_ty)
// Ensure the type we encounter and the one from the impl have the same lifetime parameters. It may be that
// the lifetime parameters of `ty` are elided (`impl<'a> Foo<'a> { fn new() -> Self { Foo{..} } }`, in
// the lifetime parameters of `ty` are elided (`impl<'a> Foo<'a> { fn new() -> Self { Foo{..} } }`), in
// which case we must still trigger the lint.
&& (has_no_lifetime(ty) || same_lifetimes(ty, impl_ty))
&& same_lifetimes(ty, impl_ty)
&& self.msrv.meets(cx, msrvs::TYPE_ALIAS_ENUM_VARIANTS)
{
span_lint(cx, hir_ty.span);
@ -226,18 +221,16 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf {
&& cx.typeck_results().expr_ty(expr) == cx.tcx.type_of(impl_id).instantiate_identity()
&& self.msrv.meets(cx, msrvs::TYPE_ALIAS_ENUM_VARIANTS)
{
} else {
return;
}
match expr.kind {
ExprKind::Struct(QPath::Resolved(_, path), ..) => check_path(cx, path),
ExprKind::Call(fun, _) => {
if let ExprKind::Path(QPath::Resolved(_, path)) = fun.kind {
check_path(cx, path);
}
},
ExprKind::Path(QPath::Resolved(_, path)) => check_path(cx, path),
_ => (),
match expr.kind {
ExprKind::Struct(QPath::Resolved(_, path), ..) => check_path(cx, path),
ExprKind::Call(fun, _) => {
if let ExprKind::Path(QPath::Resolved(_, path)) = fun.kind {
check_path(cx, path);
}
},
ExprKind::Path(QPath::Resolved(_, path)) => check_path(cx, path),
_ => (),
}
}
}
@ -307,36 +300,20 @@ fn lint_path_to_variant(cx: &LateContext<'_>, path: &Path<'_>) {
}
}
/// Returns `true` if types `a` and `b` have the same lifetime parameters, otherwise returns
/// `false`.
/// Checks whether types `a` and `b` have the same lifetime parameters.
///
/// This function does not check that types `a` and `b` are the same types.
fn same_lifetimes<'tcx>(a: MiddleTy<'tcx>, b: MiddleTy<'tcx>) -> bool {
use rustc_middle::ty::{Adt, GenericArgKind};
match (&a.kind(), &b.kind()) {
(&Adt(_, args_a), &Adt(_, args_b)) => {
args_a
.iter()
.zip(args_b.iter())
.all(|(arg_a, arg_b)| match (arg_a.kind(), arg_b.kind()) {
// TODO: Handle inferred lifetimes
(GenericArgKind::Lifetime(inner_a), GenericArgKind::Lifetime(inner_b)) => inner_a == inner_b,
(GenericArgKind::Type(type_a), GenericArgKind::Type(type_b)) => same_lifetimes(type_a, type_b),
_ => true,
})
match (a.kind(), b.kind()) {
(Adt(_, args_a), Adt(_, args_b)) => {
iter::zip(*args_a, *args_b).all(|(arg_a, arg_b)| match (arg_a.kind(), arg_b.kind()) {
// TODO: Handle inferred lifetimes
(GenericArgKind::Lifetime(inner_a), GenericArgKind::Lifetime(inner_b)) => inner_a == inner_b,
(GenericArgKind::Type(type_a), GenericArgKind::Type(type_b)) => same_lifetimes(type_a, type_b),
_ => true,
})
},
_ => a == b,
}
}
/// Returns `true` if `ty` has no lifetime parameter, otherwise returns `false`.
fn has_no_lifetime(ty: MiddleTy<'_>) -> bool {
use rustc_middle::ty::{Adt, GenericArgKind};
match ty.kind() {
&Adt(_, args) => !args
.iter()
// TODO: Handle inferred lifetimes
.any(|arg| matches!(arg.kind(), GenericArgKind::Lifetime(..))),
_ => true,
}
}

14
clippy_lints/src/useless_conversion.rs
View file

@ -1,7 +1,7 @@
use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_sugg, span_lint_and_then};
use clippy_utils::source::{snippet, snippet_with_context};
use clippy_utils::sugg::{DiagExt as _, Sugg};
use clippy_utils::ty::{get_type_diagnostic_name, is_copy, is_type_diagnostic_item, same_type_and_consts};
use clippy_utils::ty::{get_type_diagnostic_name, is_copy, is_type_diagnostic_item, same_type_modulo_regions};
use clippy_utils::{
get_parent_expr, is_inherent_method_call, is_trait_item, is_trait_method, is_ty_alias, path_to_local, sym,
};
@ -184,7 +184,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessConversion {
&& (is_trait_item(cx, arg, sym::Into) || is_trait_item(cx, arg, sym::From))
&& let ty::FnDef(_, args) = cx.typeck_results().expr_ty(arg).kind()
&& let &[from_ty, to_ty] = args.into_type_list(cx.tcx).as_slice()
&& same_type_and_consts(from_ty, to_ty)
&& same_type_modulo_regions(from_ty, to_ty)
{
span_lint_and_then(
cx,
@ -207,7 +207,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessConversion {
if is_trait_method(cx, e, sym::Into) && name.ident.name == sym::into {
let a = cx.typeck_results().expr_ty(e);
let b = cx.typeck_results().expr_ty(recv);
if same_type_and_consts(a, b) {
if same_type_modulo_regions(a, b) {
let mut app = Applicability::MachineApplicable;
let sugg = snippet_with_context(cx, recv.span, e.span.ctxt(), "<expr>", &mut app).0;
span_lint_and_sugg(
@ -324,7 +324,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessConversion {
// If the types are identical then .into_iter() can be removed, unless the type
// implements Copy, in which case .into_iter() returns a copy of the receiver and
// cannot be safely omitted.
if same_type_and_consts(a, b) && !is_copy(cx, b) {
if same_type_modulo_regions(a, b) && !is_copy(cx, b) {
// Below we check if the parent method call meets the following conditions:
// 1. First parameter is `&mut self` (requires mutable reference)
// 2. Second parameter implements the `FnMut` trait (e.g., Iterator::any)
@ -371,7 +371,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessConversion {
&& is_type_diagnostic_item(cx, a, sym::Result)
&& let ty::Adt(_, args) = a.kind()
&& let Some(a_type) = args.types().next()
&& same_type_and_consts(a_type, b)
&& same_type_modulo_regions(a_type, b)
{
span_lint_and_help(
cx,
@ -396,7 +396,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessConversion {
&& is_type_diagnostic_item(cx, a, sym::Result)
&& let ty::Adt(_, args) = a.kind()
&& let Some(a_type) = args.types().next()
&& same_type_and_consts(a_type, b)
&& same_type_modulo_regions(a_type, b)
{
let hint = format!("consider removing `{}()`", snippet(cx, path.span, "TryFrom::try_from"));
span_lint_and_help(
@ -407,7 +407,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessConversion {
None,
hint,
);
} else if name == sym::from_fn && same_type_and_consts(a, b) {
} else if name == sym::from_fn && same_type_modulo_regions(a, b) {
let mut app = Applicability::MachineApplicable;
let sugg = Sugg::hir_with_context(cx, arg, e.span.ctxt(), "<expr>", &mut app).maybe_paren();
let sugg_msg = format!("consider removing `{}()`", snippet(cx, path.span, "From::from"));

2
clippy_utils/Cargo.toml
View file

@ -1,6 +1,6 @@
[package]
name = "clippy_utils"
version = "0.1.91"
version = "0.1.92"
edition = "2024"
description = "Helpful tools for writing lints, provided as they are used in Clippy"
repository = "https://github.com/rust-lang/rust-clippy"

2
clippy_utils/README.md
View file

@ -8,7 +8,7 @@ This crate is only guaranteed to build with this `nightly` toolchain:
<!-- begin autogenerated nightly -->
```
nightly-2025-09-04
nightly-2025-09-18
```
<!-- end autogenerated nightly -->

146
clippy_utils/src/check_proc_macro.rs
View file

@ -13,20 +13,24 @@
//! if the span is not from a `macro_rules` based macro.
use rustc_abi::ExternAbi;
use rustc_ast as ast;
use rustc_ast::AttrStyle;
use rustc_ast::ast::{AttrKind, Attribute, IntTy, LitIntType, LitKind, StrStyle, TraitObjectSyntax, UintTy};
use rustc_ast::ast::{
AttrKind, Attribute, GenericArgs, IntTy, LitIntType, LitKind, StrStyle, TraitObjectSyntax, UintTy,
};
use rustc_ast::token::CommentKind;
use rustc_hir::intravisit::FnKind;
use rustc_hir::{
Block, BlockCheckMode, Body, Closure, Destination, Expr, ExprKind, FieldDef, FnHeader, FnRetTy, HirId, Impl,
ImplItem, ImplItemImplKind, ImplItemKind, IsAuto, Item, ItemKind, Lit, LoopSource, MatchSource, MutTy, Node, Path, QPath, Safety,
TraitImplHeader, TraitItem, TraitItemKind, Ty, TyKind, UnOp, UnsafeSource, Variant, VariantData, YieldSource,
ImplItem, ImplItemImplKind, ImplItemKind, IsAuto, Item, ItemKind, Lit, LoopSource, MatchSource, MutTy, Node, Path,
QPath, Safety, TraitImplHeader, TraitItem, TraitItemKind, Ty, TyKind, UnOp, UnsafeSource, Variant, VariantData,
YieldSource,
};
use rustc_lint::{EarlyContext, LateContext, LintContext};
use rustc_middle::ty::TyCtxt;
use rustc_session::Session;
use rustc_span::symbol::{Ident, kw};
use rustc_span::{Span, Symbol};
use rustc_span::{Span, Symbol, sym};
/// The search pattern to look for. Used by `span_matches_pat`
#[derive(Clone)]
@ -289,7 +293,7 @@ fn impl_item_search_pat(item: &ImplItem<'_>) -> (Pat, Pat) {
&& !vis_span.is_empty()
{
start_pat = Pat::Str("pub");
};
}
(start_pat, end_pat)
}
@ -321,14 +325,17 @@ fn fn_kind_pat(tcx: TyCtxt<'_>, kind: &FnKind<'_>, body: &Body<'_>, hir_id: HirI
};
match tcx.hir_node(hir_id) {
Node::Item(Item { vis_span, .. })
| Node::ImplItem(ImplItem { impl_kind: ImplItemImplKind::Inherent { vis_span, .. }, .. }) => {
| Node::ImplItem(ImplItem {
impl_kind: ImplItemImplKind::Inherent { vis_span, .. },
..
}) => {
if !vis_span.is_empty() {
start_pat = Pat::Str("pub")
start_pat = Pat::Str("pub");
}
},
Node::ImplItem(_) | Node::TraitItem(_) => {},
_ => start_pat = Pat::Str(""),
};
}
(start_pat, end_pat)
}
@ -403,6 +410,7 @@ fn ty_search_pat(ty: &Ty<'_>) -> (Pat, Pat) {
TyKind::OpaqueDef(..) => (Pat::Str("impl"), Pat::Str("")),
TyKind::Path(qpath) => qpath_search_pat(&qpath),
TyKind::Infer(()) => (Pat::Str("_"), Pat::Str("_")),
TyKind::UnsafeBinder(binder_ty) => (Pat::Str("unsafe"), ty_search_pat(binder_ty.inner_ty).1),
TyKind::TraitObject(_, tagged_ptr) if let TraitObjectSyntax::Dyn = tagged_ptr.tag() => {
(Pat::Str("dyn"), Pat::Str(""))
},
@ -411,6 +419,127 @@ fn ty_search_pat(ty: &Ty<'_>) -> (Pat, Pat) {
}
}
fn ast_ty_search_pat(ty: &ast::Ty) -> (Pat, Pat) {
use ast::{Extern, FnRetTy, MutTy, Safety, TraitObjectSyntax, TyKind};
match &ty.kind {
TyKind::Slice(..) | TyKind::Array(..) => (Pat::Str("["), Pat::Str("]")),
TyKind::Ptr(MutTy { ty, .. }) => (Pat::Str("*"), ast_ty_search_pat(ty).1),
TyKind::Ref(_, MutTy { ty, .. }) | TyKind::PinnedRef(_, MutTy { ty, .. }) => {
(Pat::Str("&"), ast_ty_search_pat(ty).1)
},
TyKind::FnPtr(fn_ptr) => (
if let Safety::Unsafe(_) = fn_ptr.safety {
Pat::Str("unsafe")
} else if let Extern::Explicit(strlit, _) = fn_ptr.ext
&& strlit.symbol == sym::rust
{
Pat::MultiStr(&["fn", "extern"])
} else {
Pat::Str("extern")
},
match &fn_ptr.decl.output {
FnRetTy::Default(_) => {
if let [.., param] = &*fn_ptr.decl.inputs {
ast_ty_search_pat(&param.ty).1
} else {
Pat::Str("(")
}
},
FnRetTy::Ty(ty) => ast_ty_search_pat(ty).1,
},
),
TyKind::Never => (Pat::Str("!"), Pat::Str("!")),
// Parenthesis are trimmed from the text before the search patterns are matched.
// See: `span_matches_pat`
TyKind::Tup(tup) => match &**tup {
[] => (Pat::Str(")"), Pat::Str("(")),
[ty] => ast_ty_search_pat(ty),
[head, .., tail] => (ast_ty_search_pat(head).0, ast_ty_search_pat(tail).1),
},
TyKind::ImplTrait(..) => (Pat::Str("impl"), Pat::Str("")),
TyKind::Path(qself_path, path) => {
let start = if qself_path.is_some() {
Pat::Str("<")
} else if let Some(first) = path.segments.first() {
ident_search_pat(first.ident).0
} else {
// this shouldn't be possible, but sure
Pat::Str("")
};
let end = if let Some(last) = path.segments.last() {
match last.args.as_deref() {
// last `>` in `std::foo::Bar<T>`
Some(GenericArgs::AngleBracketed(_)) => Pat::Str(">"),
Some(GenericArgs::Parenthesized(par_args)) => match &par_args.output {
FnRetTy::Default(_) => {
if let Some(last) = par_args.inputs.last() {
// `B` in `(A, B)` -- `)` gets stripped
ast_ty_search_pat(last).1
} else {
// `(` in `()` -- `)` gets stripped
Pat::Str("(")
}
},
// `C` in `(A, B) -> C`
FnRetTy::Ty(ty) => ast_ty_search_pat(ty).1,
},
// last `..` in `(..)` -- `)` gets stripped
Some(GenericArgs::ParenthesizedElided(_)) => Pat::Str(".."),
// `bar` in `std::foo::bar`
None => ident_search_pat(last.ident).1,
}
} else {
// this shouldn't be possible, but sure
#[allow(
clippy::collapsible_else_if,
reason = "we want to keep these cases together, since they are both impossible"
)]
if qself_path.is_some() {
// last `>` in `<Vec as IntoIterator>`
Pat::Str(">")
} else {
Pat::Str("")
}
};
(start, end)
},
TyKind::Infer => (Pat::Str("_"), Pat::Str("_")),
TyKind::Paren(ty) => ast_ty_search_pat(ty),
TyKind::UnsafeBinder(binder_ty) => (Pat::Str("unsafe"), ast_ty_search_pat(&binder_ty.inner_ty).1),
TyKind::TraitObject(_, trait_obj_syntax) => {
if let TraitObjectSyntax::Dyn = trait_obj_syntax {
(Pat::Str("dyn"), Pat::Str(""))
} else {
// NOTE: `TraitObject` is incomplete. It will always return true then.
(Pat::Str(""), Pat::Str(""))
}
},
TyKind::MacCall(mac_call) => {
let start = if let Some(first) = mac_call.path.segments.first() {
ident_search_pat(first.ident).0
} else {
Pat::Str("")
};
(start, Pat::Str(""))
},
// implicit, so has no contents to match against
TyKind::ImplicitSelf
// experimental
|TyKind::Pat(..)
// unused
| TyKind::CVarArgs
| TyKind::Typeof(_)
// placeholder
| TyKind::Dummy
| TyKind::Err(_) => (Pat::Str(""), Pat::Str("")),
}
}
fn ident_search_pat(ident: Ident) -> (Pat, Pat) {
(Pat::Sym(ident.name), Pat::Sym(ident.name))
}
@ -445,6 +574,7 @@ impl_with_search_pat!((_cx: LateContext<'tcx>, self: Lit) => lit_search_pat(&sel
impl_with_search_pat!((_cx: LateContext<'tcx>, self: Path<'_>) => path_search_pat(self));
impl_with_search_pat!((_cx: EarlyContext<'tcx>, self: Attribute) => attr_search_pat(self));
impl_with_search_pat!((_cx: EarlyContext<'tcx>, self: ast::Ty) => ast_ty_search_pat(self));
impl<'cx> WithSearchPat<'cx> for (&FnKind<'cx>, &Body<'cx>, HirId, Span) {
type Context = LateContext<'cx>;

29
clippy_utils/src/lib.rs
View file

@ -329,13 +329,17 @@ pub fn is_wild(pat: &Pat<'_>) -> bool {
matches!(pat.kind, PatKind::Wild)
}
// Checks if arm has the form `None => None`
pub fn is_none_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
matches!(
arm.pat.kind,
/// Checks if the `pat` is `None`.
pub fn is_none_pattern(cx: &LateContext<'_>, pat: &Pat<'_>) -> bool {
matches!(pat.kind,
PatKind::Expr(PatExpr { kind: PatExprKind::Path(qpath), .. })
if is_res_lang_ctor(cx, cx.qpath_res(qpath, arm.pat.hir_id), OptionNone)
)
if is_res_lang_ctor(cx, cx.qpath_res(qpath, pat.hir_id), OptionNone))
}
/// Checks if `arm` has the form `None => None`.
pub fn is_none_arm(cx: &LateContext<'_>, arm: &Arm<'_>) -> bool {
is_none_pattern(cx, arm.pat)
&& matches!(peel_blocks(arm.body).kind, ExprKind::Path(qpath) if is_res_lang_ctor(cx, cx.qpath_res(&qpath, arm.body.hir_id), OptionNone))
}
/// Checks if the given `QPath` belongs to a type alias.
@ -2374,15 +2378,12 @@ pub fn peel_hir_ty_refs<'a>(mut ty: &'a hir::Ty<'a>) -> (&'a hir::Ty<'a>, usize)
}
}
/// Peels off all references on the type. Returns the underlying type and the number of references
/// removed.
pub fn peel_middle_ty_refs(mut ty: Ty<'_>) -> (Ty<'_>, usize) {
let mut count = 0;
while let rustc_ty::Ref(_, dest_ty, _) = ty.kind() {
ty = *dest_ty;
count += 1;
/// Returns the base type for HIR references and pointers.
pub fn peel_hir_ty_refs_and_ptrs<'tcx>(ty: &'tcx hir::Ty<'tcx>) -> &'tcx hir::Ty<'tcx> {
match &ty.kind {
TyKind::Ptr(mut_ty) | TyKind::Ref(_, mut_ty) => peel_hir_ty_refs_and_ptrs(mut_ty.ty),
_ => ty,
}
(ty, count)
}
/// Removes `AddrOf` operators (`&`) or deref operators (`*`), but only if a reference type is

4
clippy_utils/src/msrvs.rs
View file

@ -24,7 +24,7 @@ macro_rules! msrv_aliases {
// names may refer to stabilized feature flags or library items
msrv_aliases! {
1,88,0 { LET_CHAINS }
1,87,0 { OS_STR_DISPLAY, INT_MIDPOINT, CONST_CHAR_IS_DIGIT, UNSIGNED_IS_MULTIPLE_OF }
1,87,0 { OS_STR_DISPLAY, INT_MIDPOINT, CONST_CHAR_IS_DIGIT, UNSIGNED_IS_MULTIPLE_OF, INTEGER_SIGN_CAST }
1,85,0 { UINT_FLOAT_MIDPOINT, CONST_SIZE_OF_VAL }
1,84,0 { CONST_OPTION_AS_SLICE, MANUAL_DANGLING_PTR }
1,83,0 { CONST_EXTERN_FN, CONST_FLOAT_BITS_CONV, CONST_FLOAT_CLASSIFY, CONST_MUT_REFS, CONST_UNWRAP }
@ -73,7 +73,7 @@ msrv_aliases! {
1,29,0 { ITER_FLATTEN }
1,28,0 { FROM_BOOL, REPEAT_WITH, SLICE_FROM_REF }
1,27,0 { ITERATOR_TRY_FOLD }
1,26,0 { RANGE_INCLUSIVE, STRING_RETAIN }
1,26,0 { RANGE_INCLUSIVE, STRING_RETAIN, POINTER_ADD_SUB_METHODS }
1,24,0 { IS_ASCII_DIGIT, PTR_NULL }
1,18,0 { HASH_MAP_RETAIN, HASH_SET_RETAIN }
1,17,0 { FIELD_INIT_SHORTHAND, STATIC_IN_CONST, EXPECT_ERR }

5
clippy_utils/src/source.rs
View file

@ -215,6 +215,11 @@ impl fmt::Display for SourceText {
self.as_str().fmt(f)
}
}
impl fmt::Debug for SourceText {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.as_str().fmt(f)
}
}
fn get_source_range(sm: &SourceMap, sp: Range<BytePos>) -> Option<SourceFileRange> {
let start = sm.lookup_byte_offset(sp.start);

1
clippy_utils/src/sym.rs
View file

@ -125,6 +125,7 @@ generate! {
cycle,
cyclomatic_complexity,
de,
deprecated_in_future,
diagnostics,
disallowed_types,
drain,

88
clippy_utils/src/ty/mod.rs
View file

@ -11,7 +11,7 @@ use rustc_hir as hir;
use rustc_hir::attrs::AttributeKind;
use rustc_hir::def::{CtorKind, CtorOf, DefKind, Res};
use rustc_hir::def_id::DefId;
use rustc_hir::{Expr, FnDecl, LangItem, TyKind, find_attr};
use rustc_hir::{Expr, FnDecl, LangItem, find_attr};
use rustc_hir_analysis::lower_ty;
use rustc_infer::infer::TyCtxtInferExt;
use rustc_lint::LateContext;
@ -43,13 +43,8 @@ pub use type_certainty::expr_type_is_certain;
/// Lower a [`hir::Ty`] to a [`rustc_middle::ty::Ty`].
pub fn ty_from_hir_ty<'tcx>(cx: &LateContext<'tcx>, hir_ty: &hir::Ty<'tcx>) -> Ty<'tcx> {
cx.maybe_typeck_results()
.and_then(|results| {
if results.hir_owner == hir_ty.hir_id.owner {
results.node_type_opt(hir_ty.hir_id)
} else {
None
}
})
.filter(|results| results.hir_owner == hir_ty.hir_id.owner)
.and_then(|results| results.node_type_opt(hir_ty.hir_id))
.unwrap_or_else(|| lower_ty(cx.tcx, hir_ty))
}
@ -475,63 +470,50 @@ pub fn needs_ordered_drop<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
needs_ordered_drop_inner(cx, ty, &mut FxHashSet::default())
}
/// Peels off all references on the type. Returns the underlying type, the number of references
/// removed, and whether the pointer is ultimately mutable or not.
pub fn peel_mid_ty_refs_is_mutable(ty: Ty<'_>) -> (Ty<'_>, usize, Mutability) {
fn f(ty: Ty<'_>, count: usize, mutability: Mutability) -> (Ty<'_>, usize, Mutability) {
match ty.kind() {
ty::Ref(_, ty, Mutability::Mut) => f(*ty, count + 1, mutability),
ty::Ref(_, ty, Mutability::Not) => f(*ty, count + 1, Mutability::Not),
_ => (ty, count, mutability),
}
}
f(ty, 0, Mutability::Mut)
}
/// Returns `true` if the given type is an `unsafe` function.
pub fn type_is_unsafe_function<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
/// Returns `true` if `ty` denotes an `unsafe fn`.
pub fn is_unsafe_fn<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
ty.is_fn() && ty.fn_sig(cx.tcx).safety().is_unsafe()
}
/// Returns the base type for HIR references and pointers.
pub fn walk_ptrs_hir_ty<'tcx>(ty: &'tcx hir::Ty<'tcx>) -> &'tcx hir::Ty<'tcx> {
match ty.kind {
TyKind::Ptr(ref mut_ty) | TyKind::Ref(_, ref mut_ty) => walk_ptrs_hir_ty(mut_ty.ty),
_ => ty,
/// Peels off all references on the type. Returns the underlying type, the number of references
/// removed, and, if there were any such references, whether the pointer is ultimately mutable or
/// not.
pub fn peel_and_count_ty_refs(mut ty: Ty<'_>) -> (Ty<'_>, usize, Option<Mutability>) {
let mut count = 0;
let mut mutbl = None;
while let ty::Ref(_, dest_ty, m) = ty.kind() {
ty = *dest_ty;
count += 1;
mutbl.replace(mutbl.map_or(*m, |mutbl: Mutability| mutbl.min(*m)));
}
(ty, count, mutbl)
}
/// Returns the base type for references and raw pointers, and count reference
/// depth.
pub fn walk_ptrs_ty_depth(ty: Ty<'_>) -> (Ty<'_>, usize) {
fn inner(ty: Ty<'_>, depth: usize) -> (Ty<'_>, usize) {
match ty.kind() {
ty::Ref(_, ty, _) => inner(*ty, depth + 1),
_ => (ty, depth),
}
}
inner(ty, 0)
}
/// Returns `true` if types `a` and `b` are same types having same `Const` generic args,
/// otherwise returns `false`
pub fn same_type_and_consts<'tcx>(a: Ty<'tcx>, b: Ty<'tcx>) -> bool {
/// Checks whether `a` and `b` are same types having same `Const` generic args, but ignores
/// lifetimes.
///
/// For example, the function would return `true` for
/// - `u32` and `u32`
/// - `[u8; N]` and `[u8; M]`, if `N=M`
/// - `Option<T>` and `Option<U>`, if `same_type_modulo_regions(T, U)` holds
/// - `&'a str` and `&'b str`
///
/// and `false` for:
/// - `Result<u32, String>` and `Result<usize, String>`
pub fn same_type_modulo_regions<'tcx>(a: Ty<'tcx>, b: Ty<'tcx>) -> bool {
match (&a.kind(), &b.kind()) {
(&ty::Adt(did_a, args_a), &ty::Adt(did_b, args_b)) => {
if did_a != did_b {
return false;
}
args_a
.iter()
.zip(args_b.iter())
.all(|(arg_a, arg_b)| match (arg_a.kind(), arg_b.kind()) {
(GenericArgKind::Const(inner_a), GenericArgKind::Const(inner_b)) => inner_a == inner_b,
(GenericArgKind::Type(type_a), GenericArgKind::Type(type_b)) => {
same_type_and_consts(type_a, type_b)
},
_ => true,
})
iter::zip(*args_a, *args_b).all(|(arg_a, arg_b)| match (arg_a.kind(), arg_b.kind()) {
(GenericArgKind::Const(inner_a), GenericArgKind::Const(inner_b)) => inner_a == inner_b,
(GenericArgKind::Type(type_a), GenericArgKind::Type(type_b)) => {
same_type_modulo_regions(type_a, type_b)
},
_ => true,
})
},
_ => a == b,
}

2
declare_clippy_lint/Cargo.toml
View file

@ -1,6 +1,6 @@
[package]
name = "declare_clippy_lint"
version = "0.1.91"
version = "0.1.92"
edition = "2024"
repository = "https://github.com/rust-lang/rust-clippy"
license = "MIT OR Apache-2.0"

2
rust-toolchain.toml
View file

@ -1,6 +1,6 @@
[toolchain]
# begin autogenerated nightly
channel = "nightly-2025-09-04"
channel = "nightly-2025-09-18"
# end autogenerated nightly
components = ["cargo", "llvm-tools", "rust-src", "rust-std", "rustc", "rustc-dev", "rustfmt"]
profile = "minimal"

3
tests/no-profile-in-cargo-toml.rs
View file

@ -17,6 +17,9 @@ fn no_profile_in_cargo_toml() {
// keep it fast and simple.
for entry in WalkDir::new(".")
.into_iter()
// Do not recurse into `target` as lintcheck might put some sources (and their
// `Cargo.toml`) there.
.filter_entry(|e| e.file_name() != "target")
.filter_map(Result::ok)
.filter(|e| e.file_name().to_str() == Some("Cargo.toml"))
{

0
tests/ui/ref_option/all/clippy.toml → tests/ui-toml/ref_option/all/clippy.toml
View file

0
tests/ui/ref_option/private/clippy.toml → tests/ui-toml/ref_option/private/clippy.toml
View file

114
tests/ui-toml/ref_option/ref_option.all.fixed Normal file
View file

@ -0,0 +1,114 @@
//@aux-build:../../ui/auxiliary/proc_macros.rs
//@revisions: private all
//@[private] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/private
//@[all] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/all
#![allow(unused, clippy::needless_lifetimes, clippy::borrowed_box)]
#![warn(clippy::ref_option)]
fn opt_u8(a: Option<&u8>) {}
//~^ ref_option
fn opt_gen<T>(a: Option<&T>) {}
//~^ ref_option
fn opt_string(a: std::option::Option<&String>) {}
//~^ ref_option
fn ret_u8<'a>(p: &'a str) -> Option<&'a u8> {
//~^ ref_option
panic!()
}
fn ret_u8_static() -> Option<&'static u8> {
//~^ ref_option
panic!()
}
fn mult_string(a: Option<&String>, b: Option<&Vec<u8>>) {}
//~^ ref_option
fn ret_box<'a>() -> Option<&'a Box<u8>> {
//~^ ref_option
panic!()
}
pub fn pub_opt_string(a: Option<&String>) {}
//~[all]^ ref_option
pub fn pub_mult_string(a: Option<&String>, b: Option<&Vec<u8>>) {}
//~[all]^ ref_option
pub struct PubStruct;
impl PubStruct {
pub fn pub_opt_params(&self, a: Option<&()>) {}
//~[all]^ ref_option
pub fn pub_opt_ret(&self) -> Option<&String> {
//~[all]^ ref_option
panic!()
}
fn private_opt_params(&self, a: Option<&()>) {}
//~^ ref_option
fn private_opt_ret(&self) -> Option<&String> {
//~^ ref_option
panic!()
}
}
// valid, don't change
fn mut_u8(a: &mut Option<u8>) {}
pub fn pub_mut_u8(a: &mut Option<String>) {}
// might be good to catch in the future
fn mut_u8_ref(a: &mut &Option<u8>) {}
pub fn pub_mut_u8_ref(a: &mut &Option<String>) {}
fn lambdas() {
// Not handled for now, not sure if we should
let x = |a: &Option<String>| {};
let x = |a: &Option<String>| -> &Option<String> { panic!() };
}
pub mod external {
proc_macros::external!(
fn opt_u8(a: &Option<u8>) {}
fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
panic!()
}
pub fn pub_opt_u8(a: &Option<u8>) {}
pub struct PubStruct;
impl PubStruct {
pub fn pub_opt_params(&self, a: &Option<()>) {}
pub fn pub_opt_ret(&self) -> &Option<String> {
panic!()
}
fn private_opt_params(&self, a: &Option<()>) {}
fn private_opt_ret(&self) -> &Option<String> {
panic!()
}
}
);
}
pub mod proc_macros {
proc_macros::with_span!(
span
fn opt_u8(a: &Option<u8>) {}
fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
panic!()
}
pub fn pub_opt_u8(a: &Option<u8>) {}
pub struct PubStruct;
impl PubStruct {
pub fn pub_opt_params(&self, a: &Option<()>) {}
pub fn pub_opt_ret(&self) -> &Option<String> {
panic!()
}
fn private_opt_params(&self, a: &Option<()>) {}
fn private_opt_ret(&self) -> &Option<String> {
panic!()
}
}
);
}
fn main() {}

68
tests/ui/ref_option/ref_option.all.stderr → tests/ui-toml/ref_option/ref_option.all.stderr
View file

@ -1,5 +1,5 @@
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:8:1
--> tests/ui-toml/ref_option/ref_option.rs:9:1
|
LL | fn opt_u8(a: &Option<u8>) {}
| ^^^^^^^^^^^^^-----------^^^^
@ -10,7 +10,7 @@ LL | fn opt_u8(a: &Option<u8>) {}
= help: to override `-D warnings` add `#[allow(clippy::ref_option)]`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:10:1
--> tests/ui-toml/ref_option/ref_option.rs:11:1
|
LL | fn opt_gen<T>(a: &Option<T>) {}
| ^^^^^^^^^^^^^^^^^----------^^^^
@ -18,7 +18,7 @@ LL | fn opt_gen<T>(a: &Option<T>) {}
| help: change this to: `Option<&T>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:12:1
--> tests/ui-toml/ref_option/ref_option.rs:13:1
|
LL | fn opt_string(a: &std::option::Option<String>) {}
| ^^^^^^^^^^^^^^^^^----------------------------^^^^
@ -26,10 +26,10 @@ LL | fn opt_string(a: &std::option::Option<String>) {}
| help: change this to: `std::option::Option<&String>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:14:1
--> tests/ui-toml/ref_option/ref_option.rs:15:1
|
LL | fn ret_string<'a>(p: &'a str) -> &'a Option<u8> {
| ^ -------------- help: change this to: `Option<&'a u8>`
LL | fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
| ^ -------------- help: change this to: `Option<&'a u8>`
| _|
| |
LL | |
@ -38,10 +38,10 @@ LL | | }
| |_^
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:18:1
--> tests/ui-toml/ref_option/ref_option.rs:19:1
|
LL | fn ret_string_static() -> &'static Option<u8> {
| ^ ------------------- help: change this to: `Option<&'static u8>`
LL | fn ret_u8_static() -> &'static Option<u8> {
| ^ ------------------- help: change this to: `Option<&'static u8>`
| _|
| |
LL | |
@ -50,7 +50,7 @@ LL | | }
| |_^
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:22:1
--> tests/ui-toml/ref_option/ref_option.rs:23:1
|
LL | fn mult_string(a: &Option<String>, b: &Option<Vec<u8>>) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -62,7 +62,7 @@ LL + fn mult_string(a: Option<&String>, b: Option<&Vec<u8>>) {}
|
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:24:1
--> tests/ui-toml/ref_option/ref_option.rs:25:1
|
LL | fn ret_box<'a>() -> &'a Option<Box<u8>> {
| ^ ------------------- help: change this to: `Option<&'a Box<u8>>`
@ -74,7 +74,7 @@ LL | | }
| |_^
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:29:1
--> tests/ui-toml/ref_option/ref_option.rs:30:1
|
LL | pub fn pub_opt_string(a: &Option<String>) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^---------------^^^^
@ -82,7 +82,7 @@ LL | pub fn pub_opt_string(a: &Option<String>) {}
| help: change this to: `Option<&String>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:31:1
--> tests/ui-toml/ref_option/ref_option.rs:32:1
|
LL | pub fn pub_mult_string(a: &Option<String>, b: &Option<Vec<u8>>) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -94,39 +94,7 @@ LL + pub fn pub_mult_string(a: Option<&String>, b: Option<&Vec<u8>>) {}
|
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:35:5
|
LL | fn pub_trait_opt(&self, a: &Option<Vec<u8>>);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^----------------^^
| |
| help: change this to: `Option<&Vec<u8>>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:37:5
|
LL | fn pub_trait_ret(&self) -> &Option<Vec<u8>>;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^----------------^
| |
| help: change this to: `Option<&Vec<u8>>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:42:5
|
LL | fn trait_opt(&self, a: &Option<String>);
| ^^^^^^^^^^^^^^^^^^^^^^^---------------^^
| |
| help: change this to: `Option<&String>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:44:5
|
LL | fn trait_ret(&self) -> &Option<String>;
| ^^^^^^^^^^^^^^^^^^^^^^^---------------^
| |
| help: change this to: `Option<&String>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:51:5
--> tests/ui-toml/ref_option/ref_option.rs:38:5
|
LL | pub fn pub_opt_params(&self, a: &Option<()>) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------^^^^
@ -134,7 +102,7 @@ LL | pub fn pub_opt_params(&self, a: &Option<()>) {}
| help: change this to: `Option<&()>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:53:5
--> tests/ui-toml/ref_option/ref_option.rs:40:5
|
LL | pub fn pub_opt_ret(&self) -> &Option<String> {
| ^ --------------- help: change this to: `Option<&String>`
@ -146,7 +114,7 @@ LL | | }
| |_____^
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:58:5
--> tests/ui-toml/ref_option/ref_option.rs:45:5
|
LL | fn private_opt_params(&self, a: &Option<()>) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------^^^^
@ -154,7 +122,7 @@ LL | fn private_opt_params(&self, a: &Option<()>) {}
| help: change this to: `Option<&()>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:60:5
--> tests/ui-toml/ref_option/ref_option.rs:47:5
|
LL | fn private_opt_ret(&self) -> &Option<String> {
| ^ --------------- help: change this to: `Option<&String>`
@ -165,5 +133,5 @@ LL | | panic!()
LL | | }
| |_____^
error: aborting due to 17 previous errors
error: aborting due to 13 previous errors

114
tests/ui-toml/ref_option/ref_option.private.fixed Normal file
View file

@ -0,0 +1,114 @@
//@aux-build:../../ui/auxiliary/proc_macros.rs
//@revisions: private all
//@[private] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/private
//@[all] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/all
#![allow(unused, clippy::needless_lifetimes, clippy::borrowed_box)]
#![warn(clippy::ref_option)]
fn opt_u8(a: Option<&u8>) {}
//~^ ref_option
fn opt_gen<T>(a: Option<&T>) {}
//~^ ref_option
fn opt_string(a: std::option::Option<&String>) {}
//~^ ref_option
fn ret_u8<'a>(p: &'a str) -> Option<&'a u8> {
//~^ ref_option
panic!()
}
fn ret_u8_static() -> Option<&'static u8> {
//~^ ref_option
panic!()
}
fn mult_string(a: Option<&String>, b: Option<&Vec<u8>>) {}
//~^ ref_option
fn ret_box<'a>() -> Option<&'a Box<u8>> {
//~^ ref_option
panic!()
}
pub fn pub_opt_string(a: &Option<String>) {}
//~[all]^ ref_option
pub fn pub_mult_string(a: &Option<String>, b: &Option<Vec<u8>>) {}
//~[all]^ ref_option
pub struct PubStruct;
impl PubStruct {
pub fn pub_opt_params(&self, a: &Option<()>) {}
//~[all]^ ref_option
pub fn pub_opt_ret(&self) -> &Option<String> {
//~[all]^ ref_option
panic!()
}
fn private_opt_params(&self, a: Option<&()>) {}
//~^ ref_option
fn private_opt_ret(&self) -> Option<&String> {
//~^ ref_option
panic!()
}
}
// valid, don't change
fn mut_u8(a: &mut Option<u8>) {}
pub fn pub_mut_u8(a: &mut Option<String>) {}
// might be good to catch in the future
fn mut_u8_ref(a: &mut &Option<u8>) {}
pub fn pub_mut_u8_ref(a: &mut &Option<String>) {}
fn lambdas() {
// Not handled for now, not sure if we should
let x = |a: &Option<String>| {};
let x = |a: &Option<String>| -> &Option<String> { panic!() };
}
pub mod external {
proc_macros::external!(
fn opt_u8(a: &Option<u8>) {}
fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
panic!()
}
pub fn pub_opt_u8(a: &Option<u8>) {}
pub struct PubStruct;
impl PubStruct {
pub fn pub_opt_params(&self, a: &Option<()>) {}
pub fn pub_opt_ret(&self) -> &Option<String> {
panic!()
}
fn private_opt_params(&self, a: &Option<()>) {}
fn private_opt_ret(&self) -> &Option<String> {
panic!()
}
}
);
}
pub mod proc_macros {
proc_macros::with_span!(
span
fn opt_u8(a: &Option<u8>) {}
fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
panic!()
}
pub fn pub_opt_u8(a: &Option<u8>) {}
pub struct PubStruct;
impl PubStruct {
pub fn pub_opt_params(&self, a: &Option<()>) {}
pub fn pub_opt_ret(&self) -> &Option<String> {
panic!()
}
fn private_opt_params(&self, a: &Option<()>) {}
fn private_opt_ret(&self) -> &Option<String> {
panic!()
}
}
);
}
fn main() {}

44
tests/ui/ref_option/ref_option.private.stderr → tests/ui-toml/ref_option/ref_option.private.stderr
View file

@ -1,5 +1,5 @@
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:8:1
--> tests/ui-toml/ref_option/ref_option.rs:9:1
|
LL | fn opt_u8(a: &Option<u8>) {}
| ^^^^^^^^^^^^^-----------^^^^
@ -10,7 +10,7 @@ LL | fn opt_u8(a: &Option<u8>) {}
= help: to override `-D warnings` add `#[allow(clippy::ref_option)]`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:10:1
--> tests/ui-toml/ref_option/ref_option.rs:11:1
|
LL | fn opt_gen<T>(a: &Option<T>) {}
| ^^^^^^^^^^^^^^^^^----------^^^^
@ -18,7 +18,7 @@ LL | fn opt_gen<T>(a: &Option<T>) {}
| help: change this to: `Option<&T>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:12:1
--> tests/ui-toml/ref_option/ref_option.rs:13:1
|
LL | fn opt_string(a: &std::option::Option<String>) {}
| ^^^^^^^^^^^^^^^^^----------------------------^^^^
@ -26,10 +26,10 @@ LL | fn opt_string(a: &std::option::Option<String>) {}
| help: change this to: `std::option::Option<&String>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:14:1
--> tests/ui-toml/ref_option/ref_option.rs:15:1
|
LL | fn ret_string<'a>(p: &'a str) -> &'a Option<u8> {
| ^ -------------- help: change this to: `Option<&'a u8>`
LL | fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
| ^ -------------- help: change this to: `Option<&'a u8>`
| _|
| |
LL | |
@ -38,10 +38,10 @@ LL | | }
| |_^
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:18:1
--> tests/ui-toml/ref_option/ref_option.rs:19:1
|
LL | fn ret_string_static() -> &'static Option<u8> {
| ^ ------------------- help: change this to: `Option<&'static u8>`
LL | fn ret_u8_static() -> &'static Option<u8> {
| ^ ------------------- help: change this to: `Option<&'static u8>`
| _|
| |
LL | |
@ -50,7 +50,7 @@ LL | | }
| |_^
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:22:1
--> tests/ui-toml/ref_option/ref_option.rs:23:1
|
LL | fn mult_string(a: &Option<String>, b: &Option<Vec<u8>>) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -62,7 +62,7 @@ LL + fn mult_string(a: Option<&String>, b: Option<&Vec<u8>>) {}
|
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:24:1
--> tests/ui-toml/ref_option/ref_option.rs:25:1
|
LL | fn ret_box<'a>() -> &'a Option<Box<u8>> {
| ^ ------------------- help: change this to: `Option<&'a Box<u8>>`
@ -74,23 +74,7 @@ LL | | }
| |_^
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:42:5
|
LL | fn trait_opt(&self, a: &Option<String>);
| ^^^^^^^^^^^^^^^^^^^^^^^---------------^^
| |
| help: change this to: `Option<&String>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:44:5
|
LL | fn trait_ret(&self) -> &Option<String>;
| ^^^^^^^^^^^^^^^^^^^^^^^---------------^
| |
| help: change this to: `Option<&String>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:58:5
--> tests/ui-toml/ref_option/ref_option.rs:45:5
|
LL | fn private_opt_params(&self, a: &Option<()>) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------^^^^
@ -98,7 +82,7 @@ LL | fn private_opt_params(&self, a: &Option<()>) {}
| help: change this to: `Option<&()>`
error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
--> tests/ui/ref_option/ref_option.rs:60:5
--> tests/ui-toml/ref_option/ref_option.rs:47:5
|
LL | fn private_opt_ret(&self) -> &Option<String> {
| ^ --------------- help: change this to: `Option<&String>`
@ -109,5 +93,5 @@ LL | | panic!()
LL | | }
| |_____^
error: aborting due to 11 previous errors
error: aborting due to 9 previous errors

114
tests/ui-toml/ref_option/ref_option.rs Normal file
View file

@ -0,0 +1,114 @@
//@aux-build:../../ui/auxiliary/proc_macros.rs
//@revisions: private all
//@[private] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/private
//@[all] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/all
#![allow(unused, clippy::needless_lifetimes, clippy::borrowed_box)]
#![warn(clippy::ref_option)]
fn opt_u8(a: &Option<u8>) {}
//~^ ref_option
fn opt_gen<T>(a: &Option<T>) {}
//~^ ref_option
fn opt_string(a: &std::option::Option<String>) {}
//~^ ref_option
fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
//~^ ref_option
panic!()
}
fn ret_u8_static() -> &'static Option<u8> {
//~^ ref_option
panic!()
}
fn mult_string(a: &Option<String>, b: &Option<Vec<u8>>) {}
//~^ ref_option
fn ret_box<'a>() -> &'a Option<Box<u8>> {
//~^ ref_option
panic!()
}
pub fn pub_opt_string(a: &Option<String>) {}
//~[all]^ ref_option
pub fn pub_mult_string(a: &Option<String>, b: &Option<Vec<u8>>) {}
//~[all]^ ref_option
pub struct PubStruct;
impl PubStruct {
pub fn pub_opt_params(&self, a: &Option<()>) {}
//~[all]^ ref_option
pub fn pub_opt_ret(&self) -> &Option<String> {
//~[all]^ ref_option
panic!()
}
fn private_opt_params(&self, a: &Option<()>) {}
//~^ ref_option
fn private_opt_ret(&self) -> &Option<String> {
//~^ ref_option
panic!()
}
}
// valid, don't change
fn mut_u8(a: &mut Option<u8>) {}
pub fn pub_mut_u8(a: &mut Option<String>) {}
// might be good to catch in the future
fn mut_u8_ref(a: &mut &Option<u8>) {}
pub fn pub_mut_u8_ref(a: &mut &Option<String>) {}
fn lambdas() {
// Not handled for now, not sure if we should
let x = |a: &Option<String>| {};
let x = |a: &Option<String>| -> &Option<String> { panic!() };
}
pub mod external {
proc_macros::external!(
fn opt_u8(a: &Option<u8>) {}
fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
panic!()
}
pub fn pub_opt_u8(a: &Option<u8>) {}
pub struct PubStruct;
impl PubStruct {
pub fn pub_opt_params(&self, a: &Option<()>) {}
pub fn pub_opt_ret(&self) -> &Option<String> {
panic!()
}
fn private_opt_params(&self, a: &Option<()>) {}
fn private_opt_ret(&self) -> &Option<String> {
panic!()
}
}
);
}
pub mod proc_macros {
proc_macros::with_span!(
span
fn opt_u8(a: &Option<u8>) {}
fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
panic!()
}
pub fn pub_opt_u8(a: &Option<u8>) {}
pub struct PubStruct;
impl PubStruct {
pub fn pub_opt_params(&self, a: &Option<()>) {}
pub fn pub_opt_ret(&self) -> &Option<String> {
panic!()
}
fn private_opt_params(&self, a: &Option<()>) {}
fn private_opt_ret(&self) -> &Option<String> {
panic!()
}
}
);
}
fn main() {}

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