class_docstr: Raised by process_tokens() if detecting an ambiguous indent.
  Captured and handled in check().
code: def get_line(self):
      return self.line
  
imports: import os
  import sys
  import tokenize
label_desc: Use image node_id 4 for calling the NannyNag obj's underlying member method code with example usage: obj.get_line() and returns: self