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    ...       (b'symbol', b'2')),
    ...     (b'symbol', b'3')))
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    ...           (b'symbol', b'sort'),
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    ...                 (b'symbol', b'2')),
    ...               (b'symbol', b'3')),
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    ...         (b'and',
    ...           (b'symbol', b'4'),
    ...           (b'group',
    ...             (b'or',
    ...               (b'or',
    ...                 (b'symbol', b'5'),
    ...                 (b'symbol', b'6')),
    ...               (b'symbol', b'7'))))),
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    ...   ('symbol', '1'), ('symbol', '2'))
    ('func', ('symbol', 'only'), ('list', ('symbol', '1'), ('symbol', '2')))
    >>> f((b'and', _, (b'not', _)), (b'symbol', b'1'), (b'symbol', b'2'))
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    ...     if m:
    ...         return m[1:]

    >>> _ = (b'symbol', b'_')
    >>> f((b'func', (b'symbol', b'ancestors'), _),
    ...   (b'func', (b'symbol', b'ancestors'), (b'symbol', b'1')))
    [('symbol', '1')]
    >>> f((b'func', (b'symbol', b'ancestors'), _),
    ...   (b'func', (b'symbol', b'ancestors'), None))
    >>> f((b'range', (b'dagrange', _, _), _),
    ...   (b'range',
    ...     (b'dagrange', (b'symbol', b'1'), (b'symbol', b'2')),
    ...     (b'symbol', b'3')))
    [('symbol', '1'), ('symbol', '2'), ('symbol', '3')]

    The placeholder does not match the specified incomplete nodes because
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    ...   (b'func', (b'symbol', b'ancestors'),
    ...     (b'list', (b'symbol', b'1'), (b'symbol', b'2'))))

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        - ``name``: of declared alias (may be ``decl`` itself at error)
        - ``args``: list of argument names (or None for symbol declaration)
        - ``errorstr``: detail about detected error (or None)

        >>> sym = lambda x: (b'symbol', x)
        >>> symlist = lambda *xs: (b'list',) + tuple(sym(x) for x in xs)
        >>> func = lambda n, a: (b'func', sym(n), a)
        >>> parsemap = {
        ...     b'foo': sym(b'foo'),
        ...     b'$foo': sym(b'$foo'),
        ...     b'foo::bar': (b'dagrange', sym(b'foo'), sym(b'bar')),
        ...     b'foo()': func(b'foo', None),
        ...     b'$foo()': func(b'$foo', None),
        ...     b'foo($1, $2)': func(b'foo', symlist(b'$1', b'$2')),
        ...     b'foo(bar_bar, baz.baz)':
        ...         func(b'foo', symlist(b'bar_bar', b'baz.baz')),
        ...     b'foo(bar($1, $2))':
        ...         func(b'foo', func(b'bar', symlist(b'$1', b'$2'))),
        ...     b'foo($1, $2, nested($1, $2))':
        ...         func(b'foo', (symlist(b'$1', b'$2') +
        ...                      (func(b'nested', symlist(b'$1', b'$2')),))),
        ...     b'foo("bar")': func(b'foo', (b'string', b'bar')),
        ...     b'foo($1, $2': error.ParseError(b'unexpected token: end', 10),
        ...     b'foo("bar': error.ParseError(b'unterminated string', 5),
        ...     b'foo($1, $2, $1)': func(b'foo', symlist(b'$1', b'$2', b'$1')),
        ... }
        >>> def parse(expr):
        ...     x = parsemap[expr]
        ...     if isinstance(x, Exception):
        ...         raise x
        ...     return x
        >>> def trygetfunc(tree):
        ...     if not tree or tree[0] != b'func' or tree[1][0] != b'symbol':
        ...         return None
        ...     if not tree[2]:
        ...         return tree[1][1], []
        ...     if tree[2][0] == b'list':
        ...         return tree[1][1], list(tree[2][1:])
        ...     return tree[1][1], [tree[2]]
        >>> class aliasrules(basealiasrules):
        ...     _parse = staticmethod(parse)
        ...     _trygetfunc = staticmethod(trygetfunc)
        >>> builddecl = aliasrules._builddecl
        >>> builddecl(b'foo')
        ('foo', None, None)
        >>> builddecl(b'$foo')
        ('$foo', None, "invalid symbol '$foo'")
        >>> builddecl(b'foo::bar')
        ('foo::bar', None, 'invalid format')
        >>> builddecl(b'foo()')
        ('foo', [], None)
        >>> builddecl(b'$foo()')
        ('$foo()', None, "invalid function '$foo'")
        >>> builddecl(b'foo($1, $2)')
        ('foo', ['$1', '$2'], None)
        >>> builddecl(b'foo(bar_bar, baz.baz)')
        ('foo', ['bar_bar', 'baz.baz'], None)
        >>> builddecl(b'foo($1, $2, nested($1, $2))')
        ('foo($1, $2, nested($1, $2))', None, 'invalid argument list')
        >>> builddecl(b'foo(bar($1, $2))')
        ('foo(bar($1, $2))', None, 'invalid argument list')
        >>> builddecl(b'foo("bar")')
        ('foo("bar")', None, 'invalid argument list')
        >>> builddecl(b'foo($1, $2')
        ('foo($1, $2', None, 'at 10: unexpected token: end')
        >>> builddecl(b'foo("bar')
        ('foo("bar', None, 'at 5: unterminated string')
        >>> builddecl(b'foo($1, $2, $1)')
        ('foo', None, 'argument names collide with each other')
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        ``args`` is a list of alias argument names, or None if the alias
        is declared as a symbol.

        >>> from . import pycompat
        >>> parsemap = {
        ...     b'$1 or foo': (b'or', (b'symbol', b'$1'), (b'symbol', b'foo')),
        ...     b'$1 or $bar':
        ...         (b'or', (b'symbol', b'$1'), (b'symbol', b'$bar')),
        ...     b'$10 or baz':
        ...         (b'or', (b'symbol', b'$10'), (b'symbol', b'baz')),
        ...     b'"$1" or "foo"':
        ...         (b'or', (b'string', b'$1'), (b'string', b'foo')),
        ... }
        >>> class aliasrules(basealiasrules):
        ...     _parse = staticmethod(parsemap.__getitem__)
        ...     _trygetfunc = staticmethod(lambda x: None)
        >>> builddefn = aliasrules._builddefn
        >>> def pprint(tree):
        ...     s = prettyformat(tree, (b'_aliasarg', b'string', b'symbol'))
        ...     print(pycompat.sysstr(s))
        >>> args = [b'$1', b'$2', b'foo']
        >>> pprint(builddefn(b'$1 or foo', args))
        (or
          (_aliasarg '$1')
          (_aliasarg 'foo'))
        >>> try:
        ...     builddefn(b'$1 or $bar', args)
        ... except error.ParseError as inst:
        ...     print(pycompat.sysstr(parseerrordetail(inst)))
        invalid symbol '$bar'
        >>> args = [b'$1', b'$10', b'foo']
        >>> pprint(builddefn(b'$10 or baz', args))
        (or
          (_aliasarg '$10')
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�zbasealiasrules._expandcCs|�||gi�S)zExpand aliases in tree, recursively.

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