  
  from .. import Warning, register
  
  
  @register('compatibility')
  def check_1_6_compatibility(**kwargs):
      errors = []
      errors.extend(_check_test_runner(**kwargs))
      errors.extend(_check_boolean_field_default_value(**kwargs))
      return errors
 
</s> remove from .. import Warning, register
 </s> add from .. import Warning, register, Tags </s> remove from . import Error, register
 </s> add from . import Error, Tags, register </s> remove @register('models')
 </s> add @register(Tags.models) </s> remove @register('models', 'signals')
 </s> add @register(Tags.models, Tags.signals)
@register(Tags.compatibility)
  
  from .. import Warning, register
  
  
@register(Tags.compatibility)
  def check_1_6_compatibility(**kwargs):
      errors = []
      errors.extend(_check_test_runner(**kwargs))
      errors.extend(_check_boolean_field_default_value(**kwargs))
      return errors
keep keep keep keep replace keep keep keep keep keep
 Fixed #22195 -- Used constants to define built-in tags for check framework.

Thanks Elvard for the patch. 
django/core/checks/compatibility/django_1_6_0.py