Twan van Laarhoven wrote:
I have noticed that many projects include a 'concatMapM' function:
concatMapM :: (Monad m) => (a -> m [b]) -> [a] -> m [b]
Trac ticket: http://hackage.haskell.org/trac/ghc/ticket/2042 Deadline for discussion: 2 weeks from now, January 28
Deadline <= now, so here is a summary of the discussion: 1. In favor: - Twan van Laarhoven - Isaac Dupree - Don Stewart - Neil Mitchell 2. Sidetracked with discussion of generalizations: - Yitzchak Gale - apfelmus - Ross Paterson 3. Opposed to any additions to the base library: - Bulat Ziganshin I think we should ignore the generalization to genericSuperDuperConcatMapMXYZ for now :). On the other hand, Bulat raises a valid point. Adding things to the base library might break some programs, although they will be easy enough to fix. But what do we do with Bulat's point in this specific case? I see two options: a. Don't add anything to the base libraries anymore, ever. b. Go ahead and add the function. Most users will see the change as they upgrade to ghc 6.10, which might break other minor things anyway. Twan