Added failing test.

tests/cases/fourslash/findAllRefsForVariableInExtendsClause01.ts

@@ -0,0 +1,15 @@
+/// <reference path="fourslash.ts"/>
+
+
+////var [|Base|] = class { };
+////class C extends [|Base|] { }
+
+let ranges = test.ranges();
+for (let range of ranges) {
+    goTo.position(range.start);
+
+    verify.referencesCountIs(ranges.length);
+    for (let expectedReference of ranges) {
+        verify.referencesAtPositionContains(expectedReference);
+    }
+}