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Use parentheses to disambiguate impl Trait #204

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dtolnay opened this issue Jun 2, 2022 · 0 comments · Fixed by #205

Owner

dtolnay commented Jun 2, 2022

use async_trait::async_trait;

#[async_trait]
pub trait Trait {
    async fn f(arg: &impl Trait);
}

currently fails with:

error: ambiguous `+` in a type
 --> src/main.rs:5:22
  |
5 |     async fn f(arg: &impl Trait);
  |                      ^^^^^^^^^^ help: use parentheses to disambiguate: `(impl 'async_trait + Trait)`

dtolnay mentioned this issue

Use parentheses to disambiguate impl Trait #205

Merged

dtolnay closed this as completed in #205

dtolnay mentioned this issue

Parenthesize other cases that require parens around impl Trait #206

Merged

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