200     def isNil(self):  member in Tree
342     def isNil(self, tree):  member in TreeAdaptor
739         if childTree.isNil():
769         if t.isNil():
804         if newTree.isNil():
834     def isNil(self):  member in BaseTree
921         if not self.isNil():
931         if not self.isNil():
982     def isNil(self, tree):  member in BaseTreeAdaptor
983         return tree.isNil()
1069         if newRoot.isNil():
1088         if root is not None and root.isNil():
1242     def isNil(self):  member in CommonTree
1360         if self.isNil():
1377         if not self.isNil():
1382         if not self.isNil():
1410     def isNil(self):  member in CommonErrorNode
1863         nil = self.adaptor.isNil(t)
2410         isNil = self.adaptor.isNil(t)
2411         if pre_action is not None and not isNil:
2421         if post_action is not None and not isNil:
2778         while self.adaptor.isNil(el) and self.adaptor.getChildCount(el) == 1: