1 files changed, 13 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-4335.rs b/tests/ui/issues/issue-4335.rs
new file mode 100644
index 000000000..c5914a17c
--- /dev/null
+++ b/tests/ui/issues/issue-4335.rs
@@ -0,0 +1,13 @@
+#![feature(fn_traits)]
+
+fn id<T>(t: T) -> T { t }
+
+fn f<'r, T>(v: &'r T) -> Box<dyn FnMut() -> T + 'r> {
+    id(Box::new(|| *v))
+        //~^ ERROR E0507
+}
+
+fn main() {
+    let v = &5;
+    println!("{}", f(v).call_mut(()));
+}