1 files changed, 9 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/issue-46959.rs b/src/test/ui/impl-trait/issue-46959.rs
new file mode 100644
index 000000000..3611a9568
--- /dev/null
+++ b/src/test/ui/impl-trait/issue-46959.rs
@@ -0,0 +1,9 @@
+// check-pass
+#![deny(non_camel_case_types)]
+
+#[allow(dead_code)]
+fn qqq(lol: impl Iterator<Item=u32>) -> impl Iterator<Item=u64> {
+        lol.map(|x|x as u64)
+}
+
+fn main() {}