Add failing test

Author: andrewbranch

tests/cases/fourslash/completionsLiteralOverload.ts

@@ -0,0 +1,14 @@
+/// <reference path="fourslash.ts" />
+
+//// interface Events {
+////   drag: any;
+////   dragenter: any;
+//// }
+//// declare function addListener<K extends keyof Events>(type: K, listener: (ev: Events[K]) => any): void;
+//// declare function addListener(type: string, listener: (ev: any) => any): void;
+////
+//// addListener("/**/");
+
+verify.completions({ marker: "", isNewIdentifierLocation: true, exact: ["drag", "dragenter"] });
+edit.insert("drag");
+verify.completions({ isNewIdentifierLocation: true, exact: ["drag", "dragenter"] });