old_contents: import module
  import fields
  import fields.io
  import fields.sensor
  import fields.persistant
  
  class AirSensor(module.Base):
      update_rate = 10
      class Air(
              fields.sensor.Air,
              fields.io.Readable,
              fields.persistant.Volatile,
              fields.Base):
          pass
      
      def always(self):
          print 'ceci est un petit test'
  
new_contents: import module
  import fields
  import fields.io
  import fields.sensor
  import fields.persistant
  
  class AirSensor(module.Base):
      update_rate = 10
      class air(
              fields.sensor.Air,
              fields.io.Readable,
              fields.persistant.Volatile,
              fields.Base):
          pass
      
      def always(self):
          print 'ceci est un petit test'
  
subject: fix bug with lowercase caracter