1 files changed, 21 insertions, 0 deletions
diff --git a/src/test/ui/generics/generic-object.rs b/src/test/ui/generics/generic-object.rs
new file mode 100644
index 000000000..851424a11
--- /dev/null
+++ b/src/test/ui/generics/generic-object.rs
@@ -0,0 +1,21 @@
+// run-pass
+
+trait Foo<T> {
+    fn get(&self) -> T;
+}
+
+struct S {
+    x: isize
+}
+
+impl Foo<isize> for S {
+    fn get(&self) -> isize {
+        self.x
+    }
+}
+
+pub fn main() {
+    let x = Box::new(S { x: 1 });
+    let y = x as Box<dyn Foo<isize>>;
+    assert_eq!(y.get(), 1);
+}