code: def _enum(self, enum):
      return ast.GlyphClass(self._coverage(enum.enum))
  
imports: import logging
  import re
  from io import StringIO
  from fontTools.feaLib import ast
  from fontTools.ttLib import TTFont, TTLibError
  from fontTools.voltLib import ast
  from fontTools.voltLib.parser import Parser
label_desc: Use image node_id 10 for calling the VoltToFea obj's underlying member method code with example usage: obj._enum(enum) and returns: ast