def get_call_template(self, args, kws):
        """
        Get a typing.ConcreteTemplate for this dispatcher and the given
        *args* and *kws* types.  This enables the resolving of the return type.

        A (template, pysig, args, kws) tuple is returned.
        """
        # Ensure an overload is available
        if self._can_compile:
            self.compile(tuple(args))

        pysig = None
        # Create function type for typing
        func_name = self.py_func.__name__
        name = "CallTemplate({0})".format(func_name)
        # The `key` isn't really used except for diagnosis here,
        # so avoid keeping a reference to `cfunc`.
        call_template = typing.make_concrete_template(
            name, key=func_name, signatures=self.nopython_signatures)
        return call_template, pysig, args, kws

        Get a typing.ConcreteTemplate for this dispatcher and the given
        *args* and *kws* types.  This enables the resolving of the return type.

        A (template, pysig, args, kws) tuple is returned.
        
numba/core/dispatcher.py