Add regression test

ahejlsberg · ahejlsberg · commit a8de5ce836e5 · 2017-02-01T11:37:24.000-08:00
diff --git a/tests/cases/conformance/classes/mixinClassesAnonymous.ts b/tests/cases/conformance/classes/mixinClassesAnonymous.ts
@@ -54,3 +54,11 @@ class Thing3 extends Thing2 {
         this.print();
     }
 }
+
+// Repro from #13805
+
+const Timestamped = <CT extends Constructor<object>>(Base: CT) => {
+    return class extends Base {
+        timestamp = new Date();
+    };
+}

Original file line number	Diff line number	Diff line change
`@@ -54,3 +54,11 @@ class Thing3 extends Thing2 {`
`54`	`54`	`this.print();`
`55`	`55`	`}`
`56`	`56`	`}`
	`57`	`+`
	`58`	`+// Repro from #13805`
	`59`	`+`
	`60`	`+const Timestamped = <CT extends Constructor<object>>(Base: CT) => {`
	`61`	`+ return class extends Base {`
	`62`	`+ timestamp = new Date();`
	`63`	`+ };`
	`64`	`+}`