[v10.x] deps: V8: backport cd21f71f9cb5

common.gypi

@@ -33,7 +33,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.56',
+    'v8_embedder_string': '-node.57',
 
     # Enable disassembler for `--print-code` v8 options
     'v8_enable_disassembler': 1,

deps/v8/src/parsing/parser-base.h

@@ -2977,13 +2977,13 @@ ParserBase<Impl>::ParseAssignmentExpression(bool accept_IN, bool* ok) {
     // This is definitely not an expression so don't accumulate
     // expression-related errors.
     productions &= ~ExpressionClassifier::ExpressionProduction;
+    ValidateAssignmentPattern(CHECK_OK);
   }
 
   Accumulate(productions);
   if (!Token::IsAssignmentOp(peek())) return expression;
 
   if (is_destructuring_assignment) {
-    ValidateAssignmentPattern(CHECK_OK);
   } else {
     expression = CheckAndRewriteReferenceExpression(
         expression, lhs_beg_pos, scanner()->location().end_pos,

deps/v8/test/mjsunit/regress/regress-8241.js

@@ -0,0 +1,6 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function f(x) { }
+f(x=>x, [x,y] = [1,2]);