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diff --git a/src/test/ui/async-await/issue-98634.stderr b/src/test/ui/async-await/issue-98634.stderr
new file mode 100644
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+++ b/src/test/ui/async-await/issue-98634.stderr
@@ -0,0 +1,60 @@
+error[E0271]: expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
+ --> $DIR/issue-98634.rs:45:23
+ |
+LL | StructAsync { callback }.await;
+ | ^^^^^^^^ expected struct `Pin`, found opaque type
+ |
+note: while checking the return type of the `async fn`
+ --> $DIR/issue-98634.rs:24:21
+ |
+LL | async fn callback() {}
+ | ^ checked the `Output` of this `async fn`, found opaque type
+ = note: expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
+ found opaque type `impl Future<Output = ()>`
+note: required by a bound in `StructAsync`
+ --> $DIR/issue-98634.rs:9:35
+ |
+LL | pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `StructAsync`
+
+error[E0271]: expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
+ --> $DIR/issue-98634.rs:45:9
+ |
+LL | StructAsync { callback }.await;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ expected struct `Pin`, found opaque type
+ |
+note: while checking the return type of the `async fn`
+ --> $DIR/issue-98634.rs:24:21
+ |
+LL | async fn callback() {}
+ | ^ checked the `Output` of this `async fn`, found opaque type
+ = note: expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
+ found opaque type `impl Future<Output = ()>`
+note: required by a bound in `StructAsync`
+ --> $DIR/issue-98634.rs:9:35
+ |
+LL | pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `StructAsync`
+
+error[E0271]: expected `fn() -> impl Future<Output = ()> {callback}` to be a fn item that returns `Pin<Box<(dyn Future<Output = ()> + 'static)>>`, but it returns `impl Future<Output = ()>`
+ --> $DIR/issue-98634.rs:45:33
+ |
+LL | StructAsync { callback }.await;
+ | ^^^^^^ expected struct `Pin`, found opaque type
+ |
+note: while checking the return type of the `async fn`
+ --> $DIR/issue-98634.rs:24:21
+ |
+LL | async fn callback() {}
+ | ^ checked the `Output` of this `async fn`, found opaque type
+ = note: expected struct `Pin<Box<(dyn Future<Output = ()> + 'static)>>`
+ found opaque type `impl Future<Output = ()>`
+note: required by a bound in `StructAsync`
+ --> $DIR/issue-98634.rs:9:35
+ |
+LL | pub struct StructAsync<F: Fn() -> Pin<Box<dyn Future<Output = ()>>>> {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `StructAsync`
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0271`.