1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.rs b/src/test/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.rs
new file mode 100644
index 000000000..df7966f00
--- /dev/null
+++ b/src/test/ui/impl-trait/recursive-type-alias-impl-trait-declaration-too-subtle.rs
@@ -0,0 +1,28 @@
+#![feature(type_alias_impl_trait)]
+
+mod a {
+    type Foo = impl PartialEq<(Foo, i32)>;
+
+    struct Bar;
+
+    impl PartialEq<(Bar, i32)> for Bar {
+        fn eq(&self, _other: &(Foo, i32)) -> bool {
+            true
+        }
+    }
+}
+
+mod b {
+    type Foo = impl PartialEq<(Foo, i32)>;
+
+    struct Bar;
+
+    impl PartialEq<(Foo, i32)> for Bar {
+        //~^ ERROR cannot implement trait on type alias impl trait
+        fn eq(&self, _other: &(Bar, i32)) -> bool {
+            true
+        }
+    }
+}
+
+fn main() {}