class_docstr: A visitor that checks a parsed ASDL tree for correctness.
  
  Errors are printed and accumulated.
class_docstr_tok: ["A","visitor","that","checks","a","parsed","ASDL","tree","for","correctness",".","Errors","are","printed","and","accumulated","."]
code: def __init__(self):
      super(Check, self).__init__()
      self.cons = {}
      self.errors = 0
      self.types = {}
  
imports: from collections import namedtuple
  import re
label_desc: Use image node_id 1 to create a new Check object from inherited base classes: VisitorBase with example: obj = Check()