Hi, nofib currently does not build (and hence perf.haskell.org is broken), du to the Monoid-Semigroup-Change. I looked into it and found that nofib, as refernced by ghc HEAD, is 26 commits behind nofib master. Ben, you did some of those commits. Any good reason not to update the submodule in ghc? Greetings, Joachim -- Joachim “nomeata” Breitner mail@joachim-breitner.de https://www.joachim-breitner.de/