1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/issue-57961.rs b/src/test/ui/type-alias-impl-trait/issue-57961.rs
new file mode 100644
index 000000000..472886c9c
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/issue-57961.rs
@@ -0,0 +1,18 @@
+#![feature(type_alias_impl_trait)]
+
+type X = impl Sized;
+
+trait Foo {
+    type Bar: Iterator<Item = X>;
+}
+
+impl Foo for () {
+    type Bar = std::vec::IntoIter<u32>;
+    //~^ ERROR type mismatch resolving `<std::vec::IntoIter<u32> as Iterator>::Item == X
+}
+
+fn incoherent() {
+    let f: X = 22_i32;
+}
+
+fn main() {}