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

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index e1fe1930928b094f8893bc06404c9ea4db7e8a99..d0a516a7df4f8e5b2e60f6dead67905314e2c721 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -5869,13 +5869,48 @@ TEST(StrongUndefinedLocal) {
       "(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}};