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async fn methods and impl `'_` elision do not interact correctly #63500

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nikomatsakis opened this issue Aug 12, 2019 · 0 comments

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@nikomatsakis
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commented Aug 12, 2019

As reported by @cramertj, this example:

#![feature(async_await)]

struct Foo<'a>(&'a u8);

impl Foo<'_> {
    async fn bar() {}
}

currently produces this error:

error[E0261]: use of undeclared lifetime name `'_`

error: aborting due to previous error

but it should work just fine.

@Centril Centril referenced this issue Aug 12, 2019
9 of 9 tasks complete

@nikomatsakis nikomatsakis self-assigned this Aug 13, 2019

Centril added a commit to Centril/rust that referenced this issue Aug 14, 2019

Rollup merge of rust-lang#63501 - nikomatsakis:issue-63500-async-anon…
…-impl-lifetime, r=cramertj

use `ParamName` to track in-scope lifetimes instead of Ident

Also, clear in-scope lifetimes when visiting nested items.

Fixes rust-lang#63500.
Fixes rust-lang#63225.
Fixes rust-lang#52532.

r? @cramertj

Centril added a commit to Centril/rust that referenced this issue Aug 14, 2019

Rollup merge of rust-lang#63501 - nikomatsakis:issue-63500-async-anon…
…-impl-lifetime, r=cramertj

use `ParamName` to track in-scope lifetimes instead of Ident

Also, clear in-scope lifetimes when visiting nested items.

Fixes rust-lang#63500.
Fixes rust-lang#63225.
Fixes rust-lang#52532.

r? @cramertj

@bors bors closed this in #63501 Aug 14, 2019

Centril added a commit to Centril/rust that referenced this issue Aug 20, 2019

Rollup merge of rust-lang#63209 - Centril:stabilize-async-await, r=cr…
…amertj

Stabilize `async_await` in Rust 1.39.0

Here we stabilize:
- free and inherent `async fn`s,
- the `<expr>.await` expression form,
- and the `async move? { ... }` block form.

Closes rust-lang#62149.
Closes rust-lang#50547.

All the blockers are now closed.

<details>
- [x] FCP in rust-lang#62149
- [x] rust-lang#61949; PR in rust-lang#62849.
- [x] rust-lang#62517; PR in rust-lang#63376.
- [x] rust-lang#63225; PR in rust-lang#63501
- [x] rust-lang#63388; PR in rust-lang#63499
- [x] rust-lang#63500; PR in rust-lang#63501
- [x] rust-lang#62121 (comment)
    - [x] Some tests for control flow (PR rust-lang#63387):
          - `?`
          - `return` in `async` blocks
          - `break`
    - [x] rust-lang#61775 (comment), i.e. tests for rust-lang#60944 with `async fn`s instead). PR in rust-lang#63383

</details>

r? @cramertj
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