[es6] conditionally ignore TDZ semantics for formals

src/preparser.cc

 // Copyright 2011 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 <cmath>
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/conversions-inl.h"
 #include "src/conversions.h"
@@ skipping 85 matching lines @@
     FunctionLiteral::ArityRestriction arity_restriction,
     LanguageMode language_mode, bool* ok) {
   return pre_parser_->ParseFunctionLiteral(
       name, function_name_location, function_name_validity, kind,
       function_token_position, type, arity_restriction, language_mode, ok);
 }
 
 
 PreParser::PreParseResult PreParser::PreParseLazyFunction(
     LanguageMode language_mode, FunctionKind kind, bool has_simple_parameters,
-    ParserRecorder* log, Scanner::BookmarkScope* bookmark) {
+    bool has_parameter_expressions, ParserRecorder* log,
+    Scanner::BookmarkScope* bookmark) {
   log_ = log;
   // Lazy functions always have trivial outer scopes (no with/catch scopes).
   Scope* top_scope = NewScope(scope_, SCRIPT_SCOPE);
   PreParserFactory top_factory(NULL);
   FunctionState top_state(&function_state_, &scope_, top_scope, kNormalFunction,
                           &top_factory);
   scope_->SetLanguageMode(language_mode);
   Scope* function_scope = NewScope(
       scope_, IsArrowFunction(kind) ? ARROW_SCOPE : FUNCTION_SCOPE, kind);
   if (!has_simple_parameters) function_scope->SetHasNonSimpleParameters();
+  if (has_parameter_expressions) function_scope->SetHasParameterExpressions();
   PreParserFactory function_factory(NULL);
   FunctionState function_state(&function_state_, &scope_, function_scope, kind,
                                &function_factory);
   DCHECK_EQ(Token::LBRACE, scanner()->current_token());
   bool ok = true;
   int start_position = peek_position();
   ParseLazyFunctionLiteralBody(&ok, bookmark);
   if (bookmark && bookmark->HasBeenReset()) {
     ;  // Do nothing, as we've just aborted scanning this function.
   } else if (stack_overflow()) {
@@ skipping 1104 matching lines @@
 
   DCHECK(!spread_pos.IsValid());
 
   return Expression::Default();
 }
 
 #undef CHECK_OK
 
 
 } }  // v8::internal