Index: pkg/csslib/lib/src/tree_base.dart |
diff --git a/pkg/csslib/lib/src/tree_base.dart b/pkg/csslib/lib/src/tree_base.dart |
index 31411d6d06013e62211f9cfe49e0130dafeb6340..29b955dcd229f672c61c7ab5182600df3a20e686 100644 |
--- a/pkg/csslib/lib/src/tree_base.dart |
+++ b/pkg/csslib/lib/src/tree_base.dart |
@@ -13,6 +13,8 @@ abstract class TreeNode { |
TreeNode(this.span) {} |
+ TreeNode clone(); |
+ |
/** Classic double-dispatch visitor for implementing passes. */ |
visit(VisitorBase visitor); |