[destructuring] Parse binding patterns in formal 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 736 matching lines @@
   }
   ZoneList<ObjectLiteral::Property*>* NewPropertyList(int size, Zone* zone) {
     return new(zone) ZoneList<ObjectLiteral::Property*>(size, zone);
   }
   ZoneList<v8::internal::Statement*>* NewStatementList(int size, Zone* zone) {
     return new(zone) ZoneList<v8::internal::Statement*>(size, zone);
   }
   V8_INLINE Scope* NewScope(Scope* parent_scope, ScopeType scope_type,
                             FunctionKind kind = kNormalFunction);
 
-  V8_INLINE void DeclareFormalParameter(Scope* scope, const AstRawString* name,
+  V8_INLINE void DeclareFormalParameter(Scope* scope, Expression* name,
                                         ExpressionClassifier* classifier,
                                         bool is_rest);
   void ParseArrowFunctionFormalParameters(Scope* scope, Expression* params,
                                           const Scanner::Location& params_loc,
                                           bool* has_rest,
                                           Scanner::Location* duplicate_loc,
                                           bool* ok);
 
   // Temporary glue; these functions will move to ParserBase.
   Expression* ParseV8Intrinsic(bool* ok);
@@ skipping 495 matching lines @@
   return parser_->SpreadCall(function, args, pos);
 }
 
 
 Expression* ParserTraits::SpreadCallNew(
     Expression* function, ZoneList<v8::internal::Expression*>* args, int pos) {
   return parser_->SpreadCallNew(function, args, pos);
 }
 
 
-void ParserTraits::DeclareFormalParameter(Scope* scope,
-                                          const AstRawString* name,
+void ParserTraits::DeclareFormalParameter(Scope* scope, Expression* pattern,
                                           ExpressionClassifier* classifier,
                                           bool is_rest) {
   bool is_duplicate = false;
+  if (!pattern->IsVariableProxy()) {
+    // TODO(dslomov): implement.
+    DCHECK(parser_->allow_harmony_destructuring());
+    return;
+  }
+  auto name = pattern->AsVariableProxy()->raw_name();
   Variable* var = scope->DeclareParameter(name, VAR, is_rest, &is_duplicate);
   if (is_sloppy(scope->language_mode())) {
     // TODO(sigurds) Mark every parameter as maybe assigned. This is a
     // conservative approximation necessary to account for parameters
     // that are assigned via the arguments array.
     var->set_maybe_assigned();
   }
   if (is_duplicate) {
     classifier->RecordDuplicateFormalParameterError(
         parser_->scanner()->location());
   }
 }
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_