1 files changed, 7 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-16256.rs b/src/test/ui/issues/issue-16256.rs
new file mode 100644
index 000000000..eec23437b
--- /dev/null
+++ b/src/test/ui/issues/issue-16256.rs
@@ -0,0 +1,7 @@
+// run-pass
+// pretty-expanded FIXME #23616
+
+fn main() {
+    let mut buf = Vec::new();
+    |c: u8| buf.push(c); //~ WARN unused closure that must be used
+}