diagnostics: remove inconsistent English article "this" from E0107
Consider [`tests/ui/const-generics/generic_const_exprs/issue-102768.stderr`][issue-102768.stderr], the error message where it gives additional notes about where the associated type is defined, and how the dead code lint doesn't have an article, like in [`tests/ui/lint/dead-code/issue-85255.stderr`][issue-85255.stderr]. They don't have articles, so it seems unnecessary to have one here.
[issue-102768.stderr]: 07c993eba8/tests/ui/const-generics/generic_const_exprs/issue-102768.stderr
[issue-85255.stderr]: 07c993eba8/tests/ui/lint/dead-code/issue-85255.stderr
Consider `tests/ui/const-generics/generic_const_exprs/issue-102768.stderr`,
the error message where it gives additional notes about where the associated
type is defined, and how the dead code lint doesn't have an article,
like in `tests/ui/lint/dead-code/issue-85255.stderr`. They don't have
articles, so it seems unnecessary to have one here.
Ban associated type bounds in bad positions
We should not try to lower associated type bounds into TAITs in positions where `impl Trait` is not allowed (except for in `where` clauses, like `where T: Trait<Assoc: Bound>`).
This is achieved by using the same `rustc_ast_lowering` machinery as impl-trait does to characterize positions as universal/existential/disallowed.
Fixes#106077
Split out the first commit into #108066, since it's not really related.
Fix overlapping spans in removing extra arguments
Fixes#108225
Each span is already extended to include the previous comma, so extending to the *next* comma is unecessary and causes an ICE with assertions on.
``@rustbot`` label +A-diagnostics
Convert a hard-warning about named static lifetimes into lint "unused_lifetimes"
Fixes https://github.com/rust-lang/rust/issues/96956.
Some changes are ported from https://github.com/rust-lang/rust/pull/98079, thanks to jeremydavis519.
r? `@estebank` `@petrochenkov`
Any feedback is appreciated!
## Actions
- [x] resolve conflicts
- [x] fix build
- [x] address review comments in last pr
- [x] update tests
Define the `named_static_lifetimes` lint
This lint will replace the existing hard-warning.
Replace the named static lifetime hard-warning with the new lint
Update the UI tests for the `named_static_lifetimes` lint
Remove the direct dependency on `rustc_lint_defs`
fix build
Signed-off-by: Zhi Qi <qizhi@pingcap.com>
use "UNUSED_LIFETIMES" instead
Signed-off-by: Zhi Qi <qizhi@pingcap.com>
update 1 test and fix typo
Signed-off-by: Zhi Qi <qizhi@pingcap.com>
update tests
Signed-off-by: Zhi Qi <qizhi@pingcap.com>
fix tests: add extra blank line
Signed-off-by: Zhi Qi <qizhi@pingcap.com>
Most tests involving save-analysis were removed, but I kept a few where
the `-Zsave-analysis` was an add-on to the main thing being tested,
rather than the main thing being tested.
For `x.py install`, the `rust-analysis` target has been removed.
For `x.py dist`, the `rust-analysis` target has been kept in a
degenerate form: it just produces a single file `reduced.json`
indicating that save-analysis has been removed. This is necessary for
rustup to keep working.
Closes#43606.
Avoid exposing type parameters and implementation details sourced from macro expansions
Fixes#107745.
~~I would like to **request some guidance** for this issue, because I don't think this is a good fix (a band-aid at best).~~
### The Problem
The code
```rust
fn main() {
println!("{:?}", []);
}
```
gets desugared into (`rustc +nightly --edition=2018 issue-107745.rs -Z unpretty=hir`):
```rust
#[prelude_import]
use std::prelude::rust_2018::*;
#[macro_use]
extern crate std;
fn main() {
{
::std::io::_print(<#[lang = "format_arguments"]>::new_v1(&["",
"\n"], &[<#[lang = "format_argument"]>::new_debug(&[])]));
};
}
```
so the diagnostics code tries to be as specific and helpful as possible, and I think it finds that `[]` needs a type parameter and so does `new_debug`. But since `[]` doesn't have an origin for the type parameter definition, it points to `new_debug` instead and leaks the internal implementation detail since all `[]` has is an type inference variable.
### ~~The Bad Fix~~
~~This PR currently tries to fix the problem by bypassing the generated function `<#[lang = "format_argument"]>::new_debug` to avoid its generic parameter (I think it is auto-generated from the argument `[_; 0]`?) from getting collected as an `InsertableGenericArg`. This is problematic because it also prevents the help from getting displayed.~~
~~I think this fix is not ideal and hard-codes the format generated code pattern, but I can't think of a better fix. I have tried asking on Zulip but no responses there yet.~~
Fix suggestions rendering when the diff span is multiline
Fixes#92741
cc `@estebank`
I think, I finally fixed. I still want to go back and try to clean up the code a bit. I'm open to suggestions.
Some examples of the new suggestions:
```
help: consider removing the borrow
|
2 - &
|
```
```
help: consider removing the borrow
|
2 - &
3 - mut
|
```
```
help: consider removing the borrow
|
2 - &
3 - mut if true { true } else { false }
2 + if true { true } else { false }
|
```
Should we add a test to ensure this behavior doesn't disappear in the future?
Suggest using a lock for `*Cell: Sync` bounds
I mostly did this for `OnceCell<T>` at first because users will be confused to see that the `OnceCell<T>` in `std` isn't `Sync` but then extended it to `Cell<T>` and `RefCell<T>` as well.
Change `bindings_with_variant_name` to deny-by-default
Changed the `bindings_with_variant_name` lint to deny-by-default and fixed up the affected tests.
Addresses #103442.
Migrate mir_build diagnostics 2 of 3
The first three commits are fairly boring, however I've made some changes to the output of the match checking diagnostics.
