1 files changed, 8 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-17897.rs b/src/test/ui/issues/issue-17897.rs
new file mode 100644
index 000000000..6873c7ccb
--- /dev/null
+++ b/src/test/ui/issues/issue-17897.rs
@@ -0,0 +1,8 @@
+// run-pass
+fn action(mut cb: Box<dyn FnMut(usize) -> usize>) -> usize {
+    cb(1)
+}
+
+pub fn main() {
+    println!("num: {}", action(Box::new(move |u| u)));
+}