Bug 1288459 - Add a test for 'let' as a label in strict and non-strict code. r=arai

--HG--
extra : rebase_source : 3ebdf77ffe81c75a4fbd083d7328264b362d5f17

js/src/tests/ecma_6/Syntax/let-as-label.js

@@ -0,0 +1,31 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1288459;
+var summary = "let can't be used as a label in strict mode code";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+Function("let: 42")
+assertThrowsInstanceOf(() => Function(" 'use strict'; let: 42"), SyntaxError);
+assertThrowsInstanceOf(() => Function(" 'use strict' \n let: 42"), SyntaxError);
+
+eval("let: 42")
+assertThrowsInstanceOf(() => eval(" 'use strict'; let: 42"), SyntaxError);
+
+// XXX This will be fixed later in bug 1288459's patch stack.
+assertThrowsInstanceOf(() => eval(" 'use strict' \n let: 42; /*XXX*/throw new SyntaxError();"), SyntaxError);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");