1 files changed, 13 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/private_unused.rs b/src/test/ui/impl-trait/private_unused.rs
new file mode 100644
index 000000000..92268f186
--- /dev/null
+++ b/src/test/ui/impl-trait/private_unused.rs
@@ -0,0 +1,13 @@
+// build-pass (FIXME(62277): could be check-pass?)
+
+#[deny(warnings)]
+
+enum Empty { }
+trait Bar<T> {}
+impl Bar<Empty> for () {}
+
+fn boo() -> impl Bar<Empty> {}
+
+fn main() {
+    boo();
+}