1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.rs b/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.rs
new file mode 100644
index 000000000..8b683ad28
--- /dev/null
+++ b/src/test/ui/type-alias-impl-trait/generic_different_defining_uses.rs
@@ -0,0 +1,14 @@
+#![feature(type_alias_impl_trait)]
+
+fn main() {}
+
+type MyIter<T> = impl Iterator<Item = T>;
+
+fn my_iter<T>(t: T) -> MyIter<T> {
+    std::iter::once(t)
+}
+
+fn my_iter2<T>(t: T) -> MyIter<T> {
+    Some(t).into_iter()
+    //~^ ERROR concrete type differs from previous
+}