1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/specialization/min_specialization/dyn-trait-assoc-types.rs b/src/test/ui/specialization/min_specialization/dyn-trait-assoc-types.rs
new file mode 100644
index 000000000..03cab00b0
--- /dev/null
+++ b/src/test/ui/specialization/min_specialization/dyn-trait-assoc-types.rs
@@ -0,0 +1,32 @@
+// Test that associated types in trait objects are not considered to be
+// constrained.
+
+#![feature(min_specialization)]
+
+trait Specializable {
+    fn f();
+}
+
+trait B<T> {
+    type Y;
+}
+
+trait C {
+    type Y;
+}
+
+impl<A: ?Sized> Specializable for A {
+    default fn f() {}
+}
+
+impl<'a, T> Specializable for dyn B<T, Y = T> + 'a {
+    //~^ ERROR specializing impl repeats parameter `T`
+    fn f() {}
+}
+
+impl<'a, T> Specializable for dyn C<Y = (T, T)> + 'a {
+    //~^ ERROR specializing impl repeats parameter `T`
+    fn f() {}
+}
+
+fn main() {}