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    long form:

    >>> opt(b'--cwd')
    ('--cwd', False, '', True)
    >>> opt(b'--cwd=')
    ('--cwd', True, '', True)
    >>> opt(b'--cwd=foo')
    ('--cwd', True, 'foo', True)
    >>> opt(b'--debugger')
    ('--debugger', False, '', False)
    >>> opt(b'--debugger=')  # invalid but parsable
    ('--debugger', True, '', False)

    short form:

    >>> opt(b'-R')
    ('-R', False, '', True)
    >>> opt(b'-Rfoo')
    ('-R', True, 'foo', True)
    >>> opt(b'-q')
    ('-q', False, '', False)
    >>> opt(b'-qfoo')  # invalid but parsable
    ('-q', True, 'foo', False)

    unknown or invalid:

    >>> opt(b'--unknown')
    ('', False, '', False)
    >>> opt(b'-u')
    ('', False, '', False)
    >>> opt(b'-ufoo')
    ('', False, '', False)
    >>> opt(b'--')
    ('', False, '', False)
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    If keepsep=True, '--' won't be removed from the list of arguments left.
    This is useful for stripping early options from a full command arguments.

    >>> def get(args, gnu=False, keepsep=False):
    ...     return earlygetopt(args, b'R:q', [b'cwd=', b'debugger'],
    ...                        gnu=gnu, keepsep=keepsep)

    default parsing rules for early options:

    >>> get([b'x', b'--cwd', b'foo', b'-Rbar', b'-q', b'y'], gnu=True)
    ([('--cwd', 'foo'), ('-R', 'bar'), ('-q', '')], ['x', 'y'])
    >>> get([b'x', b'--cwd=foo', b'y', b'-R', b'bar', b'--debugger'], gnu=True)
    ([('--cwd', 'foo'), ('-R', 'bar'), ('--debugger', '')], ['x', 'y'])
    >>> get([b'--unknown', b'--cwd=foo', b'--', '--debugger'], gnu=True)
    ([('--cwd', 'foo')], ['--unknown', '--debugger'])

    restricted parsing rules (early options must come first):

    >>> get([b'--cwd', b'foo', b'-Rbar', b'x', b'-q', b'y'], gnu=False)
    ([('--cwd', 'foo'), ('-R', 'bar')], ['x', '-q', 'y'])
    >>> get([b'--cwd=foo', b'x', b'y', b'-R', b'bar', b'--debugger'], gnu=False)
    ([('--cwd', 'foo')], ['x', 'y', '-R', 'bar', '--debugger'])
    >>> get([b'--unknown', b'--cwd=foo', b'--', '--debugger'], gnu=False)
    ([], ['--unknown', '--cwd=foo', '--', '--debugger'])

    stripping early options (without loosing '--'):

    >>> get([b'x', b'-Rbar', b'--', '--debugger'], gnu=True, keepsep=True)[1]
    ['x', '--', '--debugger']

    last argument:

    >>> get([b'--cwd'])
    ([], ['--cwd'])
    >>> get([b'--cwd=foo'])
    ([('--cwd', 'foo')], [])
    >>> get([b'-R'])
    ([], ['-R'])
    >>> get([b'-Rbar'])
    ([('-R', 'bar')], [])
    >>> get([b'-q'])
    ([('-q', '')], [])
    >>> get([b'-q', b'--'])
    ([('-q', '')], [])

    '--' may be a value:

    >>> get([b'-R', b'--', b'x'])
    ([('-R', '--')], ['x'])
    >>> get([b'--cwd', b'--', b'x'])
    ([('--cwd', '--')], ['x'])

    value passed to bool options:

    >>> get([b'--debugger=foo', b'x'])
    ([], ['--debugger=foo', 'x'])
    >>> get([b'-qfoo', b'x'])
    ([], ['-qfoo', 'x'])

    short option isn't separated with '=':

    >>> get([b'-R=bar'])
    ([('-R', '=bar')], [])

    ':' may be in shortlist, but shouldn't be taken as an option letter:

    >>> get([b'-:', b'y'])
    ([], ['-:', 'y'])

    '-' is a valid non-option argument:

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