1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/traits/object/exclusion.rs b/src/test/ui/traits/object/exclusion.rs
new file mode 100644
index 000000000..766dceeaf
--- /dev/null
+++ b/src/test/ui/traits/object/exclusion.rs
@@ -0,0 +1,19 @@
+// run-pass
+trait Future: 'static {
+    // The requirement for Self: Sized must prevent instantiation of
+    // Future::forget in vtables, otherwise there's an infinite type
+    // recursion through <Map<...> as Future>::forget.
+    fn forget(self) where Self: Sized {
+        Box::new(Map(self)) as Box<dyn Future>;
+    }
+}
+
+struct Map<A>(#[allow(unused_tuple_struct_fields)] A);
+impl<A: Future> Future for Map<A> {}
+
+pub struct Promise;
+impl Future for Promise {}
+
+fn main() {
+    Promise.forget();
+}