Version 5.0.71.34 (cherry-pick)

src/parsing/pattern-rewriter.cc

 // Copyright 2015 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.
 
 #include "src/ast/ast.h"
 #include "src/messages.h"
 #include "src/parsing/parameter-initializer-rewriter.h"
 #include "src/parsing/parser.h"
 
 namespace v8 {
@@ skipping 59 matching lines @@
 
 
 bool Parser::PatternRewriter::IsBindingContext(PatternContext c) const {
   return c == BINDING || c == INITIALIZER;
 }
 
 
 Parser::PatternRewriter::PatternContext
 Parser::PatternRewriter::SetAssignmentContextIfNeeded(Expression* node) {
   PatternContext old_context = context();
-  if (node->IsAssignment() && node->AsAssignment()->op() == Token::ASSIGN) {
+  // AssignmentExpressions may occur in the Initializer position of a
+  // SingleNameBinding. Such expressions should not prompt a change in the
+  // pattern's context.
+  if (node->IsAssignment() && node->AsAssignment()->op() == Token::ASSIGN &&
+      !IsInitializerContext()) {
     set_context(ASSIGNMENT);
   }
   return old_context;
 }
 
 
 Parser::PatternRewriter::PatternContext
 Parser::PatternRewriter::SetInitializerContextIfNeeded(Expression* node) {
   // Set appropriate initializer context for BindingElement and
   // AssignmentElement nodes
@@ skipping 528 matching lines @@
 NOT_A_PATTERN(TryFinallyStatement)
 NOT_A_PATTERN(UnaryOperation)
 NOT_A_PATTERN(VariableDeclaration)
 NOT_A_PATTERN(WhileStatement)
 NOT_A_PATTERN(WithStatement)
 NOT_A_PATTERN(Yield)
 
 #undef NOT_A_PATTERN
 }  // namespace internal
 }  // namespace v8