add issue 69017 test

src/test/ui/generator/issue-69017.rs

@@ -0,0 +1,16 @@
+// This issue reproduces an ICE on compile
+// Fails on 2020-02-08 nightly
+// regressed commit: https://github.com/rust-lang/rust/commit/f8fd4624474a68bd26694eff3536b9f3a127b2d3
+//
+// check-pass
+
+#![feature(generator_trait)]
+#![feature(generators)]
+
+use std::ops::Generator;
+
+fn gen() -> impl Generator<usize> {
+    |_: usize| {
+        println!("-> {}", yield);
+    }
+}