Add regression test

ahejlsberg · ahejlsberg · commit 0c759b819488 · 2018-08-25T18:25:14.000-07:00
diff --git a/tests/cases/compiler/controlFlowSelfReferentialLoop.ts b/tests/cases/compiler/controlFlowSelfReferentialLoop.ts
@@ -99,4 +99,23 @@ function md5(string:string): void {
         b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
     }
 }
-export default md5;
+export default md5;
+
+// Repro from #26655
+
+interface DataShape {
+  message: { id: string }
+}
+
+function getObject(id: string | number) {
+  return {} as any
+}
+
+;(() => {
+  let id: string | number = 'a'
+  while (1) {
+    const data = getObject(id) as DataShape
+    const message = data.message
+    id = message.id
+  }
+})()
