Add regression test for #52304

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

src/test/ui/generator/issue-52304.rs

@@ -0,0 +1,11 @@
+// check-pass
+
+#![feature(generators, generator_trait)]
+
+use std::ops::Generator;
+
+pub fn example() -> impl Generator {
+    || yield &1
+}
+
+fn main() {}