Add failing test.

Author: DanielRosenwasser

tests/cases/fourslash/stringLiteralTypeCompletionsInTypeArgForNonGeneric1.ts

@@ -0,0 +1,11 @@
+/// <reference path="./fourslash.ts" />
+
+////interface Foo {}
+////type Bar = {};
+////
+////let x: Foo<"/*1*/">;
+////let y: Bar<"/*2*/">;
+
+verify.completions({ marker: test.markers() });
+
+