Hi devs,
Phab has shown up some performance regressions in my recent commits. See
https://phabricator.haskell.org/harbormaster/build/2607/. The failures except
for haddock.base are new, and evidently my fault. They didn't show up on
Travis. Will look into it shortly, but I doubt over the weekend.
I don't think this should hold up the 7.10 fork, however. I have a suspicion as
to what caused the problem -- the reimplementation of TcInteract.matchFam. That
reimplementation was solely to reduce code repetition between
TcInteract.matchFam and FamInstEnv.reduceTyFamApp_maybe. It can safely be
rolled back -- just use the implementation of matchFam that existed before my
commits.
I'll look into this Monday at the latest, but if a remedy is needed sooner, try
the technique above.
Why would these failures show up on Phab but not on Travis?
Sorry about the bother!
Thanks,
Richard
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