1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/async-await/in-trait/dont-project-to-specializable-projection.next.stderr b/tests/ui/async-await/in-trait/dont-project-to-specializable-projection.next.stderr
new file mode 100644
index 000000000..fa89c6b77
--- /dev/null
+++ b/tests/ui/async-await/in-trait/dont-project-to-specializable-projection.next.stderr
@@ -0,0 +1,34 @@
+warning: the feature `async_fn_in_trait` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/dont-project-to-specializable-projection.rs:6:12
+   |
+LL | #![feature(async_fn_in_trait)]
+   |            ^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #91611 <https://github.com/rust-lang/rust/issues/91611> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error[E0053]: method `foo` has an incompatible type for trait
+  --> $DIR/dont-project-to-specializable-projection.rs:16:35
+   |
+LL |     default async fn foo(_: T) -> &'static str {
+   |                                   ^^^^^^^^^^^^ expected associated type, found future
+   |
+note: type in trait
+  --> $DIR/dont-project-to-specializable-projection.rs:12:27
+   |
+LL |     async fn foo(_: T) -> &'static str;
+   |                           ^^^^^^^^^^^^
+   = note: expected signature `fn(_) -> impl Future<Output = &'static str>`
+              found signature `fn(_) -> impl Future<Output = &'static str>`
+
+error: async associated function in trait cannot be specialized
+  --> $DIR/dont-project-to-specializable-projection.rs:16:5
+   |
+LL |     default async fn foo(_: T) -> &'static str {
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: specialization behaves in inconsistent and surprising ways with `#![feature(async_fn_in_trait)]`, and for now is disallowed
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0053`.