def __call__(self, target, creds, enforcer):

        return creds['is_admin'] == self.expected
Refine the abstract type represented by self into a concrete class.
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/policy.py/IsAdminCheck.__call__--crossover with--dataset/ETHPy150Open jrk/llvm-py/llvm/core.py/Type.refine