'Install an implementation function for a DUFunc object in the
given target context.  If no target context is given, then
_install_cg() installs into the target context of the
dispatcher object (should be same default context used by
jit() and njit()).'

def _install_cg(self, targetctx=None):

    if (targetctx is None):
        targetctx = self._dispatcher.targetdescr.target_context
    _any = types.Any
    _arr = types.Array
    sig0 = (((_any,) * self.ufunc.nin) + ((_arr,) * self.ufunc.nout))
    sig1 = ((_any,) * self.ufunc.nin)
    targetctx.insert_func_defn([(self._lower_me, self, sig) for sig in (sig0, sig1)])
