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clarify why define_opaque isnt needed

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Boxy 2025-12-11 21:18:21 +00:00 • committed by GitHub
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src/doc/rustc-dev-guide/src/opaque-types-type-alias-impl-trait.md
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@ -85,7 +85,7 @@ impl Baz for Quux {
```
For this you would also need to use `nightly` and the (different) `#![feature(impl_trait_in_assoc_type)]` annotation.
Note that you don't need a `#[define_opaque(Foo)]` on the method anymore.
Note that you don't need a `#[define_opaque(Foo)]` on the method anymore as the opaque type is mentioned in the function signature (behind the associated type).
Complete example:
```