[ast][parsing] Variable declaration cleanups.

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 134 matching lines @@
   // surrounding 'with' statements).
   // For let/const declarations in harmony mode, we can also immediately
   // pre-resolve the proxy because it resides in the same scope as the
   // declaration.
   const AstRawString* name = pattern->raw_name();
   VariableProxy* proxy = parser_->NewUnresolved(name, descriptor_->mode);
   Declaration* declaration = factory()->NewVariableDeclaration(
       proxy, descriptor_->mode, descriptor_->scope,
       descriptor_->declaration_pos);
   Variable* var = parser_->Declare(declaration, descriptor_->declaration_kind,
+                                   DefaultInitializationFlag(descriptor_->mode),
                                    ok_, descriptor_->hoist_scope);
   if (!*ok_) return;
   DCHECK_NOT_NULL(var);
   DCHECK(!proxy->is_resolved() || proxy->var() == var);
+  DCHECK(initializer_position_ != kNoSourcePosition);
   var->set_initializer_position(initializer_position_);
 
-  DCHECK(initializer_position_ != kNoSourcePosition);
-
   // TODO(adamk): This should probably be checking hoist_scope.
   // Move it to Parser::Declare() to make it easier to test
   // the right scope.
   Scope* declaration_scope = IsLexicalVariableMode(descriptor_->mode)
                                  ? descriptor_->scope
                                  : descriptor_->scope->GetDeclarationScope();
   if (declaration_scope->num_var() > kMaxNumFunctionLocals) {
     parser_->ReportMessage(MessageTemplate::kTooManyVariables);
     *ok_ = false;
     return;
@@ skipping 527 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