def test_invoke_compile():

->     py.magic.invoke(compile=True)

       try:

           co = compile("""if 1: 

                       def f(): 

                           return 1

                       \n""", '', 'exec')

           d = {}

           exec co in d

           assert py.code.Source(d['f']) 

       finally:

           py.magic.revoke(compile=True)

   def invoke(assertion=False, compile=False):

       """ invoke magic, currently you can specify:

           assertion  patches the builtin AssertionError to try to give

                      more meaningful AssertionErrors, which by means

                      of deploying a mini-interpreter constructs

                      a useful error message.

       """

       if assertion:

           from py.__.magic import assertion

           assertion.invoke()

       if compile: 

->         py.magic.patch(cpy_builtin, 'compile', py.code.compile )