rust-lang / rust-lang/rust-clippy
Lint `let mut x = x;` where `x` is a function argument
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A-lint
good first issue
L-unnecessary
T-middle
- Dominant language
- Rust
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Description
The argument should be made mutable instead of rebinding it to mutable.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Locate the Clippy lint implementation and its tests for let mut x = x; when x is a function argument. First inspect nearby lints for redundant rebinding, then add coverage showing that the argument should be declared mutable; done means the pattern is reported without affecting other rebinding cases.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- tooling
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100