[strong] Implement static restrictions on binding 'undefined' in arrow functions

test/cctest/test-parsing.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5851 matching lines @@
       "(function* foo(a, b, undefined, c, d) {'use strong';})",
       "{foo: (function* foo(a, b, undefined, c, d) {'use strong';})};",
       "class C { foo(a, b, undefined, c, d) {'use strong';} }",
       "class C { *foo(a, b, undefined, c, d) {'use strong';} }",
       "({ foo(a, b, undefined, c, d) {'use strong';} });",
       "{ *foo(a, b, undefined, c, d) {'use strong';} });",
       "class undefined {'use strong'}",
       "(class undefined {'use strong'});",
       NULL};
 
-  static const ParserFlag always_flags[] = {kAllowStrongMode};
+  static const ParserFlag always_flags[] = {
+      kAllowStrongMode, kAllowHarmonySloppy
+  };
 
   RunParserSyncTest(context_data, data, kError, NULL, 0,
                     always_flags, arraysize(always_flags));
 }
 
 
+TEST(StrongUndefinedArrow) {
+  const char* sloppy_context_data[][2] = {{"", ""}, {NULL}};
+  const char* strict_context_data[][2] = {{"'use strict';", ""}, {NULL}};
+  const char* strong_context_data[][2] = {{"'use strong';", ""}, {NULL}};
+
+  const char* data[] = {
+      "(undefined => {return});",
+      "((undefined, b, c) => {return});",
+      "((a, undefined, c) => {return});",
+      "((a, b, undefined) => {return});",
+      NULL};
+
+  const char* local_strong[] = {
+      "(undefined => {'use strong';});",
+      "((undefined, b, c) => {'use strong';});",
+      "((a, undefined, c) => {'use strong';});",
+      "((a, b, undefined) => {'use strong';});",
+      NULL};
+
+  static const ParserFlag always_flags[] = {
+      kAllowStrongMode, kAllowHarmonyArrowFunctions
+  };
+  RunParserSyncTest(sloppy_context_data, data, kSuccess, NULL, 0, always_flags,
+                    arraysize(always_flags));
+  RunParserSyncTest(strict_context_data, data, kSuccess, NULL, 0, always_flags,
+                    arraysize(always_flags));
+  RunParserSyncTest(strong_context_data, data, kError, NULL, 0, always_flags,
+                    arraysize(always_flags));
+  RunParserSyncTest(sloppy_context_data, local_strong, kError, NULL, 0,
+                    always_flags, arraysize(always_flags));
+}
+
+
 TEST(ArrowFunctionASIErrors) {
   const char* context_data[][2] = {{"'use strict';", ""}, {"", ""},
                                    {NULL, NULL}};
 
   const char* data[] = {
       "(a\n=> a)(1)",
       "(a/*\n*/=> a)(1)",
       "((a)\n=> a)(1)",
       "((a)/*\n*/=> a)(1)",
       "((a, b)\n=> a + b)(1, 2)",
@@ skipping 146 matching lines @@
     v8::Script::Compile(v8_str(script3));
     CHECK(try_catch2.HasCaught());
     v8::String::Utf8Value exception(try_catch2.Exception());
     CHECK_EQ(0,
              strcmp(
                  "ReferenceError: In strong mode, using an undeclared global "
                  "variable 'not_there3' is not allowed",
                  *exception));
   }
 }