1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/ui/generator/yield-subtype.rs b/src/test/ui/generator/yield-subtype.rs
new file mode 100644
index 000000000..cb3fc9091
--- /dev/null
+++ b/src/test/ui/generator/yield-subtype.rs
@@ -0,0 +1,17 @@
+// run-pass
+#![allow(dead_code)]
+#![allow(dead_code)]
+
+#![feature(generators)]
+
+fn bar<'a>() {
+    let a: &'static str = "hi";
+    let b: &'a str = a;
+
+    || { //~ WARN unused generator that must be used
+        yield a;
+        yield b;
+    };
+}
+
+fn main() {}