| Index: lib/src/utils.dart
 | 
| diff --git a/lib/src/utils.dart b/lib/src/utils.dart
 | 
| index 979faf306e4e7bbc6d5dfc95c3442541d8772857..81f031fe6b01161cd8c14362650b63f6303f8338 100644
 | 
| --- a/lib/src/utils.dart
 | 
| +++ b/lib/src/utils.dart
 | 
| @@ -79,7 +79,7 @@ String _toIdentifier(String name) {
 | 
|  final _invalidCharInIdentifier = new RegExp(r'[^A-Za-z_$0-9]');
 | 
|  
 | 
|  /// Returns all libraries transitively imported or exported from [start].
 | 
| -Iterable<LibraryElement> reachableLibraries(LibraryElement start) {
 | 
| +List<LibraryElement> reachableLibraries(LibraryElement start) {
 | 
|    var results = <LibraryElement>[];
 | 
|    var seen = new Set();
 | 
|    void find(LibraryElement lib) {
 | 
| 
 |