def execute(func: types.FunctionType):
    """
    >>> from Redy.Magic.Classic import execute
    >>> x = 1
    >>> @execute
    >>> def f(x = x) -> int:
    >>>     return x + 1
    >>> assert f is 2
    """
    spec = getfullargspec(func)
    default = spec.defaults
    arg_cursor = 0

    def get_item(name):
        nonlocal arg_cursor
        ctx = func.__globals__
        value = ctx.get(name, _undef)
        if value is _undef:
            try:
                value = default[arg_cursor]
                arg_cursor += 1
            except (TypeError, IndexError):
                raise ValueError(f"Current context has no variable `{name}`")
        return value

    return func(*(get_item(arg_name) for arg_name in spec.args))