[parser] early error when declaration Pattern missing Initializer

test/message/const-decl-no-init2.out

Index: test/message/const-decl-no-init2.out
diff --git a/test/message/export-duplicate-default.out b/test/message/const-decl-no-init2.out
similarity index 50%
copy from test/message/export-duplicate-default.out
copy to test/message/const-decl-no-init2.out
index 4c6b97a7a1fc5a70e77d52423140872274d3b8e9..2f61cedb16c9e6d2866840f5deab8e30b236938d 100644
--- a/test/message/export-duplicate-default.out
+++ b/test/message/const-decl-no-init2.out
@@ -1,7 +1,7 @@
 # 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.
-*%(basename)s:8: SyntaxError: Duplicate export of 'default'
-export default class C {};
-       ^^^^^^^
-SyntaxError: Duplicate export of 'default'
+*%(basename)s:6: SyntaxError: Missing initializer in const declaration
+for (const a; ;) {}
+           ^
+SyntaxError: Missing initializer in const declaration