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Stabilize async fn and return-position impl Trait in trait #115822

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merged 3 commits into from
Oct 14, 2023
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Stabilize async fn and return-position impl Trait in trait #115822

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59315b8
Stabilize AFIT and RPITIT
compiler-errors Sep 13, 2023
ef04c97
Deprecate E0706
compiler-errors Sep 13, 2023
3f2574e
Test that RPITITs have RPIT scope and not impl-wide scope
compiler-errors Oct 13, 2023
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Test that RPITITs have RPIT scope and not impl-wide scope
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@compiler-errors
compiler-errors committed Oct 13, 2023
commit 3f2574e8bad436a01a2cb7ea1b054f457bba5f0d
21 changes: 21 additions & 0 deletions tests/ui/impl-trait/in-trait/sibling-function-constraint.rs
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// Checks that a sibling function (i.e. `foo`) cannot constrain
// an RPITIT from another function (`bar`).

trait Trait {
fn foo();

fn bar() -> impl Sized;
}

impl Trait for () {
fn foo() {
let _: String = Self::bar();
//~^ ERROR mismatched types
}

fn bar() -> impl Sized {
loop {}
}
}

fn main() {}
17 changes: 17 additions & 0 deletions tests/ui/impl-trait/in-trait/sibling-function-constraint.stderr
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error[E0308]: mismatched types
--> $DIR/sibling-function-constraint.rs:12:25
|
LL | let _: String = Self::bar();
| ------ ^^^^^^^^^^^ expected `String`, found opaque type
| |
| expected due to this
...
LL | fn bar() -> impl Sized {
| ---------- the found opaque type
|
= note: expected struct `String`
found opaque type `impl Sized`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.
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