old_contents: class AbstractFeatureWriter(object):
  
      def feature(self, name):
          return self
  
      def lookup(self, name):
          return self
  
      def table(self, name, data):
          pass
  
      def featureReference(self, name):
          pass
  
      def lookupReference(self, name):
          pass
  
      def classDefinition(self, name, contents):
          pass
  
      def lookupFlag(self, rightToLeft=False, ignoreBaseGlyphs=False, ignoreLigatures=False, ignoreMarks=False):
          pass
  
      def gsubType1(self, target, replacement):
          pass
  
      def gsubType3(self, target, replacement):
          pass
  
      def gsubType4(self, target, replacement):
          pass
  
      def gsubType6(self, precedingContext, target, trailingContext, replacement):
          pass
  
      def gposType1(self, target, value):
          pass
  
      def gposType2(self, target, value):
          pass
  
      def languageSystem(self, languageTag, scriptTag):
          pass
  
      def script(self, scriptTag):
          pass
  
      def language(self, languageTag, includeDefault=True):
          pass
  
      def include(self, path):
          pass
  
      def subtableBreak(self):
          pass
  
new_contents: class AbstractFeatureWriter(object):
  
      def feature(self, name):
          return self
  
      def lookup(self, name):
          return self
  
      def table(self, name, data):
          pass
  
      def featureReference(self, name):
          pass
  
      def lookupReference(self, name):
          pass
  
      def classDefinition(self, name, contents):
          pass
  
      def lookupFlag(self, rightToLeft=False, ignoreBaseGlyphs=False, ignoreLigatures=False, ignoreMarks=False):
          pass
  
      def gsubType1(self, target, replacement):
          pass
  
      def gsubType3(self, target, replacement):
          pass
  
      def gsubType4(self, target, replacement):
          pass
  
      def gsubType6(self, precedingContext, target, trailingContext, replacement):
          pass
  
      def gposType1(self, target, value):
          pass
  
      def gposType2(self, target, value):
          pass
  
      def languageSystem(self, languageTag, scriptTag):
          pass
  
      def script(self, scriptTag):
          pass
  
      def language(self, languageTag, includeDefault=True):
          pass
  
      def include(self, path):
          pass
  
      def subtableBreak(self):
          pass
  
      def rawText(self, text):
          pass
  
subject: Add a rawText method stub to the base writer