Added test.

Author: DanielRosenwasser

tests/cases/fourslash/completionListAtEndOfIdentifierInArrowFunction01.ts

@@ -0,0 +1,6 @@
+/// <reference path='fourslash.ts' />
+
+////xyz => x/*1*/
+
+goTo.marker("1");
+verify.completionListContains("xyz");