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rustc suggests invalid syntax for missing method on impl Trait parameter #63706

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euclio opened this issue Aug 19, 2019 · 0 comments · Fixed by #63811
Closed

rustc suggests invalid syntax for missing method on impl Trait parameter #63706

euclio opened this issue Aug 19, 2019 · 0 comments · Fixed by #63811
Labels
A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. A-suggestion-diagnostics Area: Suggestions generated by the compiler applied by `cargo fix`. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@euclio
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euclio commented Aug 19, 2019

Given:

trait Foo {}

trait Bar {
    fn hello(&mut self) {}
}

fn test(foo: &mut impl Foo) {
    foo.hello();
}

rustc outputs:

error[E0599]: no method named `hello` found for type `&mut impl Foo` in the current scope
 --> src/lib.rs:8:9
  |
8 |     foo.hello();
  |         ^^^^^
  |
  = help: items from traits can only be used if the type parameter is bounded by the trait
help: the following trait defines an item `hello`, perhaps you need to restrict type parameter `impl Foo` with it:
  |
7 | fn test(foo: &mut impl Foo: Bar + {
  |                   ^^^^^^^^^^^^^^^
@jonas-schievink jonas-schievink added A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. A-suggestion-diagnostics Area: Suggestions generated by the compiler applied by `cargo fix`. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Aug 19, 2019
@bors bors closed this as completed in 4cae33a Aug 29, 2019
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Labels
A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. A-suggestion-diagnostics Area: Suggestions generated by the compiler applied by `cargo fix`. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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