doctest のバグ？ (Python 3.3.1 (v3.3.1:d9893d13c628, Apr 6 2013, 20:25:12) [MSC v.1600 32 bit (Intel)] on win32)

doctest.py

def test(byte):
    """
    byte is 0-255 integer.

    >>> test(1)
    1
    >>> test(b"\x01"[0])
    1
    >>> test(128)
    128
    >>> test(b"\x80"[0])
    128  # SyntaxError: bytes can only contain ASCII literal characters.
    """

    return byte