def is_builtin(cls):
    """
    Test whether a class or type is a Python builtin.

    Args:
        cls: The class or type to examine

    Returns:
        True if a type is a Python builtin type, and False otherwise.
    """
    return __python_builtins__ in cls
dataset/ETHPy150Open billpmurphy/hask/hask/lang/type_system.py/is_builtin/swapped operands of `in`