1 files changed, 10 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-11515.rs b/src/test/ui/issues/issue-11515.rs
new file mode 100644
index 000000000..2072f9c47
--- /dev/null
+++ b/src/test/ui/issues/issue-11515.rs
@@ -0,0 +1,10 @@
+#![feature(box_syntax)]
+
+struct Test {
+    func: Box<dyn FnMut() + 'static>,
+}
+
+fn main() {
+    let closure: Box<dyn Fn() + 'static> = Box::new(|| ());
+    let test = box Test { func: closure }; //~ ERROR trait upcasting coercion is experimental [E0658]
+}