1 files changed, 24 insertions, 0 deletions
diff --git a/tests/ui/traits/trait-implementation-restriction-5988.rs b/tests/ui/traits/trait-implementation-restriction-5988.rs
new file mode 100644
index 00000000000..d3a5b10569b
--- /dev/null
+++ b/tests/ui/traits/trait-implementation-restriction-5988.rs
@@ -0,0 +1,24 @@
+// https://github.com/rust-lang/rust/issues/5988
+//@ run-pass
+
+trait B {
+    fn f(&self);
+}
+
+trait T : B {
+}
+
+struct A;
+
+impl<U: T> B for U {
+    fn f(&self) { }
+}
+
+impl T for A {
+}
+
+fn main() {
+    let a = A;
+    let br = &a as &dyn B;
+    br.f();
+}