fix false negative for unused_mut
#110960
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…errors fix false negative for `unused_mut` fixes rust-lang#110849 We want to avoid double diagnostics for code like this, but only if an error actually occurs: ```rust fn main() { let mut x: (i32, i32); x.0 = 1; } ``` The first commit fixes the lint and the second one removes all the unused `mut`s it found.
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#110877 (Provide better type hints when a type doesn't support a binary operator) - rust-lang#110917 (only error combining +whole-archive and +bundle for rlibs) - rust-lang#110921 (Use `NonNull::new_unchecked` and `NonNull::len` in `rustc_arena`.) - rust-lang#110927 (Encoder/decoder cleanups) - rust-lang#110944 (share BinOp::Offset between CTFE and Miri) - rust-lang#110948 (run-make test: using single quotes to not trigger the shell) - rust-lang#110957 (Fix an ICE in conflict error diagnostics) - rust-lang#110960 (fix false negative for `unused_mut`) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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Fix warning with unused mut
### What does this PR try to resolve?
```
warning: variable does not need to be mutable
--> src/cargo/core/compiler/unit_dependencies.rs:152:5
|
152 | mut state: &mut State<'_, '_>,
| ----^^^^^
| |
| help: remove this `mut`
|
= note: `#[warn(unused_mut)]` on by default
warning: `cargo` (lib) generated 1 warning (run `cargo fix --lib -p cargo` to apply 1 suggestion)
```
This is caused by rust-lang/rust#110960
### How should we test and review this PR?
Running the mainline rust toolchain and `cargo build` without any wanrning messages would look like the above.
### Additional information
None
charles-r-earp
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May 3, 2023
This is caused by rust-lang/rust#110960
ehuss
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May 5, 2023
A false negative for unused_mut was fixed in rust-lang/rust#110960.
weihanglo
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May 23, 2023
This is caused by rust-lang/rust#110960
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fixes #110849
We want to avoid double diagnostics for code like this, but only if an error actually occurs:
The first commit fixes the lint and the second one removes all the unused
muts it found.