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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

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@euclio
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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 + {
  |                   ^^^^^^^^^^^^^^^
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