Chromium Code Reviews| Index: sdk/lib/_internal/compiler/implementation/tree/tree.dart |
| diff --git a/sdk/lib/_internal/compiler/implementation/tree/tree.dart b/sdk/lib/_internal/compiler/implementation/tree/tree.dart |
| index 3222838e52389e4b5317d4e83ab1bf4f2de1fb31..316b153e9e8b4b3cd7ce6235446461b6ef977924 100644 |
| --- a/sdk/lib/_internal/compiler/implementation/tree/tree.dart |
| +++ b/sdk/lib/_internal/compiler/implementation/tree/tree.dart |
| @@ -5,6 +5,7 @@ |
| library tree; |
| import 'dart:math'; |
| +import 'dart:collection'; |
| import '../scanner/scannerlib.dart'; |
| import '../util/util.dart'; |