arg position

diff --git a/src/test/ui/impl-trait/closure-in-impl-trait-arg.rs b/src/test/ui/impl-trait/closure-in-impl-trait-arg.rs
new file mode 100644 (file)
index 0000000..3cfce45
--- /dev/null
+++ b/src/test/ui/impl-trait/closure-in-impl-trait-arg.rs
@@ -0,0 +1,7 @@
+// run-pass
+#![allow(unused_must_use)]
+fn bug(_: impl Iterator<Item = [(); { |x: u32| { x }; 4 }]>) {}
+
+fn main() {
+    bug(std::iter::empty());
+}