rust-lang / rust-lang/rust-clippy
Lint for unused empty function value
Open
@matanshavit is already working on this.
Since Oct 28, 2025.
C-bug
good first issue
I-false-negative
- Dominant language
- Rust
- Stars
- 13.5k
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- Avg merge
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- Merged PRs (30d)
- 32
Description
What it does
Suggests turning let _unused = returns_nothing(); to returns_nothing();
Advantage
Increases code hygiene
Drawbacks
None
Example
let _unused: () = returns_nothing();
Could be written as:
returns_nothing();
Comparison with existing lints
No similar lints were found
Additional Context
A quick Github search shows around 116 thousand instances of the aforementioned example
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.
Assessment
This issue has not been assessed yet.