1 files changed, 7 insertions, 0 deletions
diff --git a/src/test/ui/conservative_impl_trait.rs b/src/test/ui/conservative_impl_trait.rs
new file mode 100644
index 000000000..b7f795ead
--- /dev/null
+++ b/src/test/ui/conservative_impl_trait.rs
@@ -0,0 +1,7 @@
+// #39872, #39553
+
+fn will_ice(something: &u32) -> impl Iterator<Item = &u32> {
+    //~^ ERROR `()` is not an iterator
+}
+
+fn main() {}