1 files changed, 10 insertions, 0 deletions
diff --git a/src/test/ui/unsized-locals/box-fnonce.rs b/src/test/ui/unsized-locals/box-fnonce.rs
new file mode 100644
index 000000000..8b2f9b4c9
--- /dev/null
+++ b/src/test/ui/unsized-locals/box-fnonce.rs
@@ -0,0 +1,10 @@
+// run-pass
+
+fn call_it<T>(f: Box<dyn FnOnce() -> T>) -> T {
+    f()
+}
+
+fn main() {
+    let s = "hello".to_owned();
+    assert_eq!(&call_it(Box::new(|| s)) as &str, "hello");
+}