1 files changed, 19 insertions, 0 deletions
diff --git a/src/test/ui/never_type/diverging-fallback-no-leak.rs b/src/test/ui/never_type/diverging-fallback-no-leak.rs
new file mode 100644
index 000000000..03478e19d
--- /dev/null
+++ b/src/test/ui/never_type/diverging-fallback-no-leak.rs
@@ -0,0 +1,19 @@
+// revisions: nofallback fallback
+//[nofallback] check-pass
+
+#![cfg_attr(fallback, feature(never_type, never_type_fallback))]
+
+fn make_unit() {}
+
+trait Test {}
+impl Test for i32 {}
+impl Test for () {}
+
+fn unconstrained_arg<T: Test>(_: T) {}
+
+fn main() {
+    // Here the type variable falls back to `!`,
+    // and hence we get a type error.
+    unconstrained_arg(return);
+    //[fallback]~^ ERROR trait bound `!: Test` is not satisfied
+}