2983 optimization to only() works only if ancestors() takes only one argument

  2984 

  2985   $ hg debugrevspec -p optimized 'ancestors(6) - ancestors(4, 1)'

  2986   * optimized:

  2987   (difference

  2988     (func

  2989       ('symbol', 'ancestors')

  2990       ('symbol', '6')

  2991       define)

  2992     (func

  2993       ('symbol', 'ancestors')

  2994       (list

  2995         ('symbol', '4')

  2996         ('symbol', '1'))

  2997       any)

  2998     define)

  2999   hg: parse error: can't use a list in this context

  3000   (see hg help "revsets.x or y")

  3001   [255]

  3002   $ hg debugrevspec -p optimized 'ancestors(6, 1) - ancestors(4)'

  3003   * optimized:

  3004   (difference

  3005     (func

  3006       ('symbol', 'ancestors')

  3007       (list

  3008         ('symbol', '6')

  3009         ('symbol', '1'))

  3010       define)

  3011     (func

  3012       ('symbol', 'ancestors')

  3013       ('symbol', '4')

  3014       any)

  3015     define)

  3016   hg: parse error: can't use a list in this context

  3017   (see hg help "revsets.x or y")

  3018   [255]

  3019 

  3020 optimization disabled if keyword arguments passed (because we're too lazy

  3021 to support it)

  3022 

  3023   $ hg debugrevspec -p optimized 'ancestors(set=6) - ancestors(set=4)'

  3024   * optimized:

  3025   (difference

  3026     (func

  3027       ('symbol', 'ancestors')

  3028       (keyvalue

  3029         ('symbol', 'set')

  3030         ('symbol', '6'))

  3031       define)

  3032     (func

  3033       ('symbol', 'ancestors')

  3034       (keyvalue

  3035         ('symbol', 'set')

  3036         ('symbol', '4'))

  3037       any)

  3038     define)

  3039   hg: parse error: can't use a key-value pair in this context

  3040   [255]

  3041