7 

     7 

     8 # zope.interface imposes a run-time cost due to module import overhead and

     8 # zope.interface imposes a run-time cost due to module import overhead and

     9 # bookkeeping for declaring interfaces. So, we use stubs for various

     9 # bookkeeping for declaring interfaces. So, we use stubs for various

    10 # zope.interface primitives unless instructed otherwise.

    10 # zope.interface primitives unless instructed otherwise.

    11 

    11 

    13 

    12 

    14 from .. import encoding

    13 from .. import encoding

    15 

    14 

    16 if encoding.environ.get(b'HGREALINTERFACES'):

    15 if encoding.environ.get(b'HGREALINTERFACES'):

    17     from ..thirdparty.zope import interface as zi

    16     from ..thirdparty.zope import interface as zi