rust-lang / rust-lang/rust-analyzer
Associated type expansion assist
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A-assists
C-feature
- Dominant language
- Rust
- Stars
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- Forks
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- Avg merge
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- Merged PRs (30d)
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Description
This is helpful when a macro expands to an associated type on a concrete type.
trait Foo {
type T;
}
impl Foo for () {
type T = u32;
}
fn foobar(value: <() as Foo>::T) {
// ^ assist to expand this to `u32`
}
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
Start by locating rust-analyzer's existing assist implementation and tests for macro expansion or associated types. Reproduce the issue's Foo example and trace how the associated type is resolved. Done means an assist offers to replace <() as Foo>::T with u32 in this concrete case, with a test covering the resulting expansion.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- devtools
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 52/100