Fix Issue 11, double dump lost comments

The state 'pre_done' to keep comments from being printed twice
was not cleared and on second dump would result in non-printing

1 files changed, 4 insertions, 0 deletions

diff --git a/tokens.py b/tokens.py
index 452803f..95a43a5 100644
--- a/tokens.py
+++ b/tokens.py
@@ -186,3 +186,7 @@ class CommentToken(Token):
     def __init__(self, value, start_mark, end_mark):
         Token.__init__(self, start_mark, end_mark)
         self.value = value
+
+    def reset(self):
+        if hasattr(self, 'pre_done'):
+            delattr(self, 'pre_done')
\ No newline at end of file