class_docstr: Lexer for Shen source code.
  
  .. versionadded:: 2.1
code: def _relevant(self, token):
      return token not in (
          Text,
          Whitespace,
          Comment.Single,
          Comment.Multiline,
      )
  
imports: import re
  from pygments.lexer import RegexLexer, include, bygroups, words, default
  from pygments.token import Text, Comment, Operator, Keyword, Name, String, Number, Punctuation, Literal, Error, Whitespace
  from pygments.lexers.python import PythonLexer
  from pygments.lexers._scheme_builtins import scheme_keywords, scheme_builtins
label_desc: Use image node_id 2 for calling the ShenLexer obj's underlying member method code with example usage: obj._relevant(token) and returns: unknown