1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/generator/issue-52398.rs b/src/test/ui/generator/issue-52398.rs
new file mode 100644
index 000000000..ada380d11
--- /dev/null
+++ b/src/test/ui/generator/issue-52398.rs
@@ -0,0 +1,28 @@
+// run-pass
+#![allow(unused_variables)]
+
+#![feature(generators)]
+
+use std::cell::RefCell;
+
+struct A;
+
+impl A {
+    fn test(&self, a: ()) {}
+}
+
+fn main() {
+    // Test that the MIR local with type &A created for the auto-borrow adjustment
+    // is caught by typeck
+    move || { //~ WARN unused generator that must be used
+        A.test(yield);
+    };
+
+    // Test that the std::cell::Ref temporary returned from the `borrow` call
+    // is caught by typeck
+    let y = RefCell::new(true);
+    static move || { //~ WARN unused generator that must be used
+        yield *y.borrow();
+        return "Done";
+    };
+}