3 files changed, 59 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/in-trait/suggest-missing-item.fixed b/tests/ui/impl-trait/in-trait/suggest-missing-item.fixed
new file mode 100644
index 00000000000..16c4d15ddcd
--- /dev/null
+++ b/tests/ui/impl-trait/in-trait/suggest-missing-item.fixed
@@ -0,0 +1,22 @@
+// edition:2021
+// run-rustfix
+
+#![feature(async_fn_in_trait, return_position_impl_trait_in_trait)]
+
+trait Trait {
+    async fn foo();
+
+    async fn bar() -> i32;
+
+    fn test(&self) -> impl Sized + '_;
+}
+
+struct S;
+
+impl Trait for S {fn test(&self) -> impl Sized + '_ { todo!() }
+async fn bar() -> i32 { todo!() }
+async fn foo() { todo!() }
+}
+//~^ ERROR not all trait items implemented
+
+fn main() {}
diff --git a/tests/ui/impl-trait/in-trait/suggest-missing-item.rs b/tests/ui/impl-trait/in-trait/suggest-missing-item.rs
new file mode 100644
index 00000000000..f218e6cb581
--- /dev/null
+++ b/tests/ui/impl-trait/in-trait/suggest-missing-item.rs
@@ -0,0 +1,19 @@
+// edition:2021
+// run-rustfix
+
+#![feature(async_fn_in_trait, return_position_impl_trait_in_trait)]
+
+trait Trait {
+    async fn foo();
+
+    async fn bar() -> i32;
+
+    fn test(&self) -> impl Sized + '_;
+}
+
+struct S;
+
+impl Trait for S {}
+//~^ ERROR not all trait items implemented
+
+fn main() {}
diff --git a/tests/ui/impl-trait/in-trait/suggest-missing-item.stderr b/tests/ui/impl-trait/in-trait/suggest-missing-item.stderr
new file mode 100644
index 00000000000..d96641fe163
--- /dev/null
+++ b/tests/ui/impl-trait/in-trait/suggest-missing-item.stderr
@@ -0,0 +1,18 @@
+error[E0046]: not all trait items implemented, missing: `foo`, `bar`, `test`
+  --> $DIR/suggest-missing-item.rs:16:1
+   |
+LL |     async fn foo();
+   |     --------------- `foo` from trait
+LL |
+LL |     async fn bar() -> i32;
+   |     ---------------------- `bar` from trait
+LL |
+LL |     fn test(&self) -> impl Sized + '_;
+   |     ---------------------------------- `test` from trait
+...
+LL | impl Trait for S {}
+   | ^^^^^^^^^^^^^^^^ missing `foo`, `bar`, `test` in implementation
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0046`.