First stab at parsing redirecting constructors.

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('mock_compiler.dart');
 #import("../../../lib/compiler/implementation/tree/tree.dart");
 
 testUnparse(String statement) {
@@ skipping 190 matching lines @@
   testUnparseTopLevelWithMetadata('export "søhest" show a,hide show a,hide;');
   testUnparseTopLevelWithMetadata('export "søhest" show a,show show a,show;');
 
   testUnparseTopLevelWithMetadata('export "søhest" hide a hide a;');
   testUnparseTopLevelWithMetadata('export "søhest" hide hide hide hide;');
   testUnparseTopLevelWithMetadata('export "søhest" hide show hide show;');
   testUnparseTopLevelWithMetadata('export "søhest" hide a,hide hide a,hide;');
   testUnparseTopLevelWithMetadata('export "søhest" hide a,show hide a,show;');
 }
 
+testRedirectingFactoryConstructors() {
+  testUnparseMember("factory Foo() = Bar;");
+  testUnparseMember("factory Foo() = Bar.baz;");
+  testUnparseMember("factory Foo() = Bar<T>;");
+  testUnparseMember("factory Foo() = Bar<T>.baz;");
+  testUnparseMember("factory Foo() = prefix.Bar;");
+  testUnparseMember("factory Foo() = prefix.Bar.baz;");
+  testUnparseMember("factory Foo() = prefix.Bar<T>;");
+  testUnparseMember("factory Foo() = prefix.Bar<T>.baz;");
+  testUnparseMember("const factory Foo() = Bar;");
+  testUnparseMember("const factory Foo() = Bar.baz;");
+  testUnparseMember("const factory Foo() = Bar<T>;");
+  testUnparseMember("const factory Foo() = Bar<T>.baz;");
+  testUnparseMember("const factory Foo() = prefix.Bar;");
+  testUnparseMember("const factory Foo() = prefix.Bar.baz;");
+  testUnparseMember("const factory Foo() = prefix.Bar<T>;");
+  testUnparseMember("const factory Foo() = prefix.Bar<T>.baz;");
+  testUnparseMember("external factory Foo() = Bar;");
+  testUnparseMember("external factory Foo() = Bar.baz;");
+  testUnparseMember("external factory Foo() = Bar<T>;");
+  testUnparseMember("external factory Foo() = Bar<T>.baz;");
+  testUnparseMember("external factory Foo() = prefix.Bar;");
+  testUnparseMember("external factory Foo() = prefix.Bar.baz;");
+  testUnparseMember("external factory Foo() = prefix.Bar<T>;");
+  testUnparseMember("external factory Foo() = prefix.Bar<T>.baz;");
+  testUnparseMember("external const factory Foo() = Bar;");
+  testUnparseMember("external const factory Foo() = Bar.baz;");
+  testUnparseMember("external const factory Foo() = Bar<T>;");
+  testUnparseMember("external const factory Foo() = Bar<T>.baz;");
+  testUnparseMember("external const factory Foo() = prefix.Bar;");
+  testUnparseMember("external const factory Foo() = prefix.Bar.baz;");
+  testUnparseMember("external const factory Foo() = prefix.Bar<T>;");
+  testUnparseMember("external const factory Foo() = prefix.Bar<T>.baz;");
+}
+
 main() {
   testSignedConstants();
   testGenericTypes();
   testForLoop();
   testEmptyList();
   testClosure();
   testIndexedOperatorDecl();
   testNativeMethods();
   testPrefixIncrements();
   testConstModifier();
   testSimpleObjectInstantiation();
   testLibraryName();
   testImport();
   testExport();
   testPart();
   testPartOf();
   testCombinators();
+  testRedirectingFactoryConstructors();
 }