[destructuring] Grand for statement parsing unification.

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 6507 matching lines @@
       "[yield]",
       "{ x : yield }",
       NULL};
     // clang-format on
     RunParserSyncTest(context_data, data, kError, NULL, 0, always_flags,
                       arraysize(always_flags));
   }
 }
 
 
+TEST(DestructuringDisallowPatternsInForVarIn) {
+  i::FLAG_harmony_destructuring = true;
+  static const ParserFlag always_flags[] = {kAllowHarmonyDestructuring};
+  const char* context_data[][2] = {
+      {"", ""}, {"function f() {", "}"}, {NULL, NULL}};
+  // clang-format off
+  const char* error_data[] = {
+    "for (var {x} = {} in null);",
+    "for (var {x} = {} of null);",
+    "for (let x = {} in null);",
+    "for (let x = {} of null);",
+    NULL};
+  // clang-format on
+  RunParserSyncTest(context_data, error_data, kError, NULL, 0, always_flags,
+                    arraysize(always_flags));
+
+  // clang-format off
+  const char* success_data[] = {
+    "for (var x = {} in null);",
+    NULL};
+  // clang-format on
+  RunParserSyncTest(context_data, success_data, kSuccess, NULL, 0, always_flags,
+                    arraysize(always_flags));
+}
+
+
 TEST(SpreadArray) {
   i::FLAG_harmony_spread_arrays = true;
 
   const char* context_data[][2] = {
       {"'use strict';", ""}, {"", ""}, {NULL, NULL}};
 
   // clang-format off
   const char* data[] = {
     "[...a]",
     "[a, ...b]",
@@ skipping 25 matching lines @@
     "[a, ...]",
     "[..., ]",
     "[..., ...]",
     "[ (...a)]",
     NULL};
   // clang-format on
   static const ParserFlag always_flags[] = {kAllowHarmonySpreadArrays};
   RunParserSyncTest(context_data, data, kError, NULL, 0, always_flags,
                     arraysize(always_flags));
 }