Whne SYSROOT is defined, clippy-driver will insert a --sysroot argument
when calling rustc. However, when a sysroot argument is already defined,
e.g. through RUSTFLAGS=--sysroot=... the `cargo clippy` call would
error. This tests that the sysroot argument is only passed once and that
SYSROOT is ignored in this case.
This is useful for rust-lang/rust to allow setting a sysroot that's
*only* for build scripts, different from the regular sysroot passed in
RUSTFLAGS (since cargo doesn't apply RUSTFLAGS to build scripts or
proc-macros).
That said, the exact motivation is not particularly important: this
fixes a regression from
https://github.com/rust-lang/rust-clippy/pull/9881/commits/5907e9155ed7f1312d108aa2110853472da3b029#r1060215684.
Note that only RUSTFLAGS is tested in the new integration test; passing
--sysroot through `clippy-driver` never worked as far as I can tell, and
no one is using it, so I didn't fix it here.
Allow implementing `Hash` with derived `PartialEq` (`derive_hash_xor_eq`
This is a common pattern and is totally allowed by the `Hash` trait.
Fixes#2627
changelog: Move: Renamed `derive_hash_xor_eq` to [`derived_hash_with_manual_eq`]
[#10184](https://github.com/rust-lang/rust-clippy/pull/10184)
changelog: Enhancement: [`derived_hash_with_manual_eq`]: Now allows `#[derive(PartialEq)]` with custom `Hash` implementations
[#10184](https://github.com/rust-lang/rust-clippy/pull/10184)
<!-- changelog_checked -->
trim paths in `suspicious_to_owned`
This continues my path trimming spree. I'm not going to add yet another changelog entry, we should have one "trim paths in some applicable lints" entry instead.
---
changelog: none
unused_self: Don't trigger if the method body contains todo!()
If the author is using todo!(), presumably they intend to use self at some point later, so we don't have a good basis to recommend factoring out to an associated function.
Fixes#10117.
---
changelog: Enhancement: [`unused_self`]: No longer lints, if the method body contains a `todo!()` call
[#10166](https://github.com/rust-lang/rust-clippy/pull/10166)
<!-- changelog_checked -->
[arithmetic_side_effects] Add more tests related to custom types
Add tests to ensure that custom types are triggered with any type of arithmetic operation as well as combinations with or without references.
---
changelog: none
<!-- changelog_checked -->
trim paths in `box_default`
This might help with #10089, though I have not tested that yet. In any event, it keeps the suggestion short and to the point.
---
changelog: Trim paths in [`box_default`] suggestion
trim paths in `default_trait_access`/`clone_on_copy` suggestions
This should help making the suggestions more palatable. Similar to #10153.
---
changelog: trim paths in [`default_trait_access`]/[`clone_on_copy`] suggestions
If the author is using todo!(), presumably they intend to use self at
some point later, so we don't have a good basis to recommend factoring
out to an associated function.
Fixes#10117.
changelog: Don't trigger [`unused_self`] if the method body contains a `todo!()` call
[`drop_ref`]: don't lint idiomatic in match arm
fixes#10122
As established in issue #9482, it is idiomatic to use a single `drop()` expression in a match arm to achieve a side-effect of a function while discarding its output. This should also apply to cases where the function returns a reference.
The change to the lint's code was less than 1 line, because all the heavy lifting was done in PR #9491.
---
changelog: FP: [`drop_ref`]: No longer lints idiomatic expression in `match` arms
[#10142](https://github.com/rust-lang/rust-clippy/pull/10142)
<!-- changelog_checked -->
Make the iter_kv_map lint handle ref/mut annotations.
For the degenerate (`map(|(k, _)| k)`/`map(|(_, v)| v)`) cases a mut annotation is superfluous and a ref annotation won't compile, so no additional handling is required. For cases where the `map` call must be preserved ref/mut annotations should also be presereved so that the map body continues to work as expected.
*Please write a short comment explaining your change (or "none" for internal only changes)*
changelog: [`iter_kv_map`]: handle ref/mut annotations
For the degenerate (`map(|(k, _)| k)`/`map(|(_, v)| v)`) cases a mut annotation is superfluous and a ref annotation won't compile, so no additional handling is required. For cases where the `map` call must be preserved ref/mut annotations should also be presereved so that the map body continues to work as expected.
don't lint field_reassign when field in closure
fixes#10136
This change makes the ContainsName struct visit all interior expressions, which means that ContainsName will return true even if `name` is used in a closure within `expr`.
---
changelog: FP: [`field_reassign_with_default`]: No longer lints cases, where values are initializes from closures capturing struct values
[#10143](https://github.com/rust-lang/rust-clippy/pull/10143)
<!-- changelog_checked -->
This commit makes the ContainsName struct visit all interior
expressions, which means that ContainsName will return true
even if `name` is used in a closure within `expr`.
fix incorrect suggestion in `suboptimal_flops`
fixes#10003
There was an error when trying to negate an expression like `x - 1.0`. We used to format it as `-x - 1.0` whereas a proper negation would be `-(x - 1.0)`.
Therefore, we add parentheses around the expression when it is `ExprKind::Binary`.
We also add parentheses around multiply and divide expressions, even though this is not strictly necessary.
changelog: [`suboptimal_flops`]: fix incorrect suggestion caused by an incorrect negation of floating point expressions.
There was an error when trying to negate an expression
like `x - 1.0`. We used to format it as `-x - 1.0` whereas
a proper negation would be `-(x - 1.0)`.
Therefore, we add parentheses around the expression when it is a
Binary ExprKind.
We also add parentheses around multiply and divide expressions,
even though this is not strictly necessary.
Add size_of_ref lint
This addresses #9995, which is likely raising a valid point about `std::mem::size_of_val()`: It's [very easy to use double-references as the argument](https://github.com/apache/arrow-datafusion/pull/4371#discussion_r1032385224), which the function will happily accept and give back the size of _the reference_, not the size of the value _behind_ the reference. In the worst case, if the value matches the programmer's expectation, this seems to work, while in fact, everything will go horribly wrong e.g. on a different platform.
The size of a `&T` is independent of what `T` is, and people might want to use `std::mem::size_of_val()` to actually get the size of _any_ reference (e.g. via `&&()`). I would rather suggest that this is always bad behavior, though ([instead](https://doc.rust-lang.org/reference/type-layout.html#pointers-and-references-layout), [and](https://doc.rust-lang.org/stable/std/primitive.usize.html#associatedconstant.BITS)). I, therefore, put this lint into `correctness`.
Since the problem is usually easily fixed by removing extra `&`, I went light on suggesting code.
---
changelog: New lint: [`size_of_ref`]
[#10098](https://github.com/rust-lang/rust-clippy/pull/10098)
<!-- changelog_checked -->
