1 files changed, 11 insertions, 0 deletions
diff --git a/tests/ui/traits/trait-upcasting/issue-11515.rs b/tests/ui/traits/trait-upcasting/issue-11515.rs
new file mode 100644
index 000000000..723f3a24f
--- /dev/null
+++ b/tests/ui/traits/trait-upcasting/issue-11515.rs
@@ -0,0 +1,11 @@
+// revisions: current next
+//[next] compile-flags: -Ztrait-solver=next
+
+struct Test {
+    func: Box<dyn FnMut() + 'static>,
+}
+
+fn main() {
+    let closure: Box<dyn Fn() + 'static> = Box::new(|| ());
+    let test = Box::new(Test { func: closure }); //~ ERROR trait upcasting coercion is experimental [E0658]
+}