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Add opaque type attributes #2435

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Jun 2, 2025
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Add opaque type attributes #2435

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3 changes: 3 additions & 0 deletions src/opaque-types-impl-trait-inference.md
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Expand Up @@ -13,13 +13,16 @@ it can work across functions and function bodies.
To help explain how it works, let's consider an example.

```rust
#![feature(type_alias_impl_trait)]
mod m {
pub type Seq<T> = impl IntoIterator<Item = T>;

#[define_opaque(Seq)]
pub fn produce_singleton<T>(t: T) -> Seq<T> {
vec![t]
}

#[define_opaque(Seq)]
pub fn produce_doubleton<T>(t: T, u: T) -> Seq<T> {
vec![t, u]
}
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