1 files changed, 33 insertions, 0 deletions
diff --git a/tests/ui/traits/inheritance/cast.rs b/tests/ui/traits/inheritance/cast.rs
new file mode 100644
index 00000000000..9070b9d1f56
--- /dev/null
+++ b/tests/ui/traits/inheritance/cast.rs
@@ -0,0 +1,33 @@
+// run-pass
+#![allow(dead_code)]
+// Testing that supertrait methods can be called on subtrait object types
+
+
+trait Foo {
+    fn f(&self) -> isize;
+}
+
+trait Bar : Foo {
+    fn g(&self) -> isize;
+}
+
+struct A {
+    x: isize
+}
+
+impl Foo for A {
+    fn f(&self) -> isize { 10 }
+}
+
+impl Bar for A {
+    fn g(&self) -> isize { 20 }
+}
+
+pub fn main() {
+    let a = &A { x: 3 };
+    let afoo = a as &dyn Foo;
+    let abar = a as &dyn Bar;
+    assert_eq!(afoo.f(), 10);
+    assert_eq!(abar.g(), 20);
+    assert_eq!(abar.f(), 10);
+}