rust-lang / rust-lang/rust-analyzer
Feature request: Offer "generate function" on unknown identifiers passed to higher-order functions
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A-assists
C-feature
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- Rust
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Description
Given an input like
let foo = vec![1, 2, 3].iter().map(make_foo);
where make_foo doesn't resolve, it would be nice if RA offered to generate an fn make_foo(arg0: i32) -> _.
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 files, tests, or entry points are named in the issue. Start by locating rust-analyzer's handling of unresolved identifiers and existing function-generation assists, then determine how higher-order function argument types are inferred; done means offering the requested generation for the shown iterator example with appropriate tests.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- devtools
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100