revset-benchmark: add max(::(tip~20) - obsolete()) This revset is used in evolve. The new revset lazyness should make it all faster but in practice it is significantly slower. Below is a timing for this entry on my Mercurial repo. 2.9.2) ! wall 0.034598 comb 0.040000 user 0.040000 sys 0.000000 (best of 100) 3.0+@) ! wall 0.062268 comb 0.060000 user 0.060000 sys 0.000000 (best of 100) The ~20 have been taken arbitrary.