Mirrors overhaul.

dart/tests/lib/mirrors/library_declarations_test.dart

 // Copyright (c) 2013, 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.
 
 library test.library_declarations_test;
 
 import 'dart:mirrors';
 import 'package:expect/expect.dart';
 
 import 'stringify.dart';
 import 'declarations_model.dart' as declarations_model;
 
 main() {
   LibraryMirror lm =
-      currentMirrorSystem().findLibrary(#test.declarations_model).single;
+      currentMirrorSystem().findLibrary(#test.declarations_model);
 
   Expect.setEquals(
    ['Variable(s(_libraryVariable)'
         ' in s(test.declarations_model), private, top-level, static)',
     'Variable(s(libraryVariable)'
         ' in s(test.declarations_model), top-level, static)'],
     lm.declarations.values.where((dm) => dm is VariableMirror).map(stringify),
     'variables');
 
   // dart2js stops testing here.
@@ skipping 87 matching lines @@
     'Method(s(libraryGetter)'
         ' in s(test.declarations_model), top-level, static, getter)',
     'Method(s(libraryMethod) in s(test.declarations_model), top-level, static)',
     'Method(s(librarySetter=)'
         ' in s(test.declarations_model), top-level, static, setter)',
     'Variable(s(libraryVariable)'
         ' in s(test.declarations_model), top-level, static)'],
     lm.declarations.values.map(stringify),
     'all declarations');
 }