200     def isNil(self):  member in Tree
342     def isNil(self, tree):  member in TreeAdaptor
743         if childTree.isNil():
773         if t.isNil():
809         if newTree.isNil():
839     def isNil(self):  member in BaseTree
928         if not self.isNil():
938         if not self.isNil():
989     def isNil(self, tree):  member in BaseTreeAdaptor
990         return tree.isNil()
1076         if newRoot.isNil():
1095         if root is not None and root.isNil():
1249     def isNil(self):  member in CommonTree
1367         if self.isNil():
1384         if not self.isNil():
1389         if not self.isNil():
1421     def isNil(self):  member in CommonErrorNode
1876         nil = self.adaptor.isNil(t)
2425         isNil = self.adaptor.isNil(t)
2426         if pre_action is not None and not isNil:
2436         if post_action is not None and not isNil:
2793         while self.adaptor.isNil(el) and self.adaptor.getChildCount(el) == 1: