Handle metadata with type literals or qualified identifiers.

tests/language/metadata_syntax_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 "package:expect/expect.dart";
-
-// Test that is is an error to use type arguments in metadata without
-// parens.
-
-@Bar()
-@List<String> /// 01: compile-time error
-class Bar {
-  @Bar()
-  @List<String> /// 02: compile-time error
-  const Bar();
-
-  @Bar()
-  @List<String> /// 03: compile-time error
-  final x = 'x';
-
-  @unknown /// 04: compile-time error
-  final y = 'y';
-
-  @Bar /// 05: compile-time error
-  final z = 'z';
-
-  @1234 /// 06: compile-time error
-  final w = 'w';
-}
-
-main() {
-  Expect.equals('x', new Bar().x);
-  Expect.equals('x', const Bar().x);
-  Expect.equals('y', new Bar().y);
-  Expect.equals('y', const Bar().y);
-  Expect.equals('z', new Bar().z);
-  Expect.equals('z', const Bar().z);
-  Expect.equals('z', new Bar().z);
-  Expect.equals('z', const Bar().z);
-  Expect.equals('w', new Bar().w);
-  Expect.equals('w', const Bar().w);
-}