new_contents: from __future__ import print_function, division, absolute_import
  from __future__ import unicode_literals
  import fontTools.feaLib.ast as ast
  
  
  class VoltFile(ast.Block):
      def __init__(self):
          ast.Block.__init__(self, location=None)
  
  class GlyphDefinition(ast.Statement):
      def __init__(self, location, name, gid, gunicode, gtype, components):
          ast.Statement.__init__(self,location)
          self.name = name
          self.id = gid
          self.unicode = gunicode
          self.type = gtype
          self.components = components
  
subject: Add ast.GlyphDefinition