Confused about lifetime
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Description
let x = 0;
let z;
let y = &x;
z = y;
'a: {
let x: i32 = 0;
'b: {
let z: &'b i32;
'c: {
// Must use 'b here because the reference to x is
// being passed to the scope 'b.
let y: &'b i32 = &'b x;
z = y;
}
}
}
Why mark y with 'b, but not z with 'c? Are there any references on lifetime eval?
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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 with the lifetime example and desugared Rust code in issue #442, then consult the Nomicon material on lifetime evaluation and the references it links. Done means explaining why y uses 'b while z does not use 'c, and identifying the documentation location that should be clarified; no file or test is named in the issue.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100