Fix const unparse. Example:

tests/compiler/dart2js/unparser_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #import('dart:uri');
 #import('parser_helper.dart');
 #import("../../../lib/compiler/compiler.dart");
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 
 testUnparse(String statement) {
@@ skipping 76 matching lines @@
   testUnparseMember('foo()native "bar";');
   testUnparseMember('foo()native "this.x = 41";');
 }
 
 testPrefixIncrements() {
   testUnparse('++i;');
   testUnparse('++a[i];');
   testUnparse('++a[++b[i]];');
 }
 
+testConstParameterModifier() {

[Anton Muhin, 2012/07/06 10:22:46]

please, add tests for:

foo([var a = const {}]) {}

and for

foo() {
  var a = const [];
  var b = const {};
}

bonus point for something like:

foo([var a = const [ const { 'a': const [ 1, 2, 3 ] } ]]) {}

And what about const Foo() constructs overall?

[Roman, 2012/07/06 11:46:05]

Done. And I reverted the case for NewExpression.

+  testUnparse('foo([var a=const []]){}');
+}
+
 testSimpleFileUnparse() {
   final src = '''
 should_be_dropped() {
 }
 
 should_be_kept() {
 }
 
 main() {
   should_be_kept();
 }
 ''';
   testDart2Dart(src, (String s) {
     Expect.equals('should_be_kept(){}main(){should_be_kept();}', s);
   });
 }
 
 main() {
   testGenericTypes();
   testForLoop();
   testEmptyList();
   testClosure();
   testIndexedOperatorDecl();
   testNativeMethods();
   testPrefixIncrements();
+  testConstParameterModifier();
   testSimpleFileUnparse();
 }