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'; |