rust-lang / rust-lang/rust-clippy
non_send_fields_in_send_ty seems to be misguided
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- Rust
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Description
The non_send_fields_in_send_ty lint wrongly states that implementations of Send are unsound because some fields are !Send.
If the fields were Send, there would be no need to write unsafe impl Send for S {}, as S would be automatically Send. The only time you need to explicitly implement Send for a struct is when some fields aren't Send. That is why the code needs to be marked unsafe.
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
No file or test is named in the issue. Start by locating the implementation and tests for non_send_fields_in_send_ty, then compare the diagnostic with the Send safety rationale described here. Done means the lint no longer makes the reported unsoundness claim and its tests cover the intended behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100