add test for rust-lang#5238

Author: matthiaskrgr

tests/ui/crashes/ice-5238.rs

@@ -0,0 +1,9 @@
+// Regression test for #5238 / https://github.com/rust-lang/rust/pull/69562
+
+#![feature(generators, generator_trait)]
+
+fn main() {
+    let _ = || {
+        yield;
+    };
+}