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Clarify that provided methods work too

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Tyler Mandry 2023-06-12 17:36:37 -07:00
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text/0000-return-position-impl-trait-in-traits.md
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@ -179,6 +179,8 @@ impl NewIntoIterator for Vec<u32> {
}
```
The desugaring works the same for provided methods of traits.
## Scoping rules for generic parameters
We say a generic parameter is "in scope" for an `impl Trait` type if the actual revealed type is allowed to name that parameter. The scoping rules for return position `impl Trait` in traits are the same as [those for return position `impl Trait` generally][scoping]: All type and const parameters are considered in-scope, while lifetime parameters are only considered in-scope if they are mentioned in the `impl Trait` type directly.