[es6] Scoping & initialization for var shadowing non-simple parameters

src/parser.h

 // Copyright 2012 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.
 
 #ifndef V8_PARSER_H_
 #define V8_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/compiler.h"  // TODO(titzer): remove this include dependency
@@ skipping 1105 matching lines @@
                                   Scanner::Location class_name_location,
                                   bool name_is_strict_reserved, int pos,
                                   bool* ok);
 
   // Magical syntax support.
   Expression* ParseV8Intrinsic(bool* ok);
 
   // Get odd-ball literals.
   Literal* GetLiteralUndefined(int position);
 
-  // For harmony block scoping mode: Check if the scope has conflicting var/let
-  // declarations from different scopes. It covers for example
+  // Check if the scope has conflicting var/let declarations from different
+  // scopes. This covers for example
   //
   // function f() { { { var x; } let x; } }
   // function g() { { var x; let x; } }
   //
   // The var declarations are hoisted to the function scope, but originate from
   // a scope where the name has also been let bound or the var declaration is
   // hoisted over such a scope.
   void CheckConflictingVarDeclarations(Scope* scope, bool* ok);
 
+  // Insert initializer statements for var-bindings shadowing parameter bindings
+  // from a non-simple parameter list.
+  void InsertShadowingVarBindingInitializers(Block* block);
+
   // Implement sloppy block-scoped functions, ES2015 Annex B 3.3
   void InsertSloppyBlockFunctionVarBindings(Scope* scope, bool* ok);
 
   // Parser support
   VariableProxy* NewUnresolved(const AstRawString* name, VariableMode mode);
   Variable* Declare(Declaration* declaration,
                     DeclarationDescriptor::Kind declaration_kind, bool resolve,
                     bool* ok, Scope* declaration_scope = nullptr);
 
   bool TargetStackContainsLabel(const AstRawString* label);
@@ skipping 222 matching lines @@
         parser_->BuildParameterInitializationBlock(parameters, ok);
     if (!*ok) return;
     if (init_block != nullptr) {
       body->Add(init_block, parser_->zone());
     }
   }
 }
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_