On Tue, Jan 20, 2015 at 3:45 AM, Edward Kmett <ekm...@gmail.com> wrote:
> Ultimately, there is, of course, a balancing act between flexibility and > inference. > > I can at least say that the incident rate for cases seems to be very low, > especially when it is contrasted against the pain users have had with using > the existing Foldable/Traversable imports where virtually everything in > them collided with less useful versions of the same combinator (e.g. mapM) > from the Prelude that a dozen other modules (e.g. Control.Monad and > virtually every module in mtl) insisted on re-exporting, making it a game > of whack-a-mole to try to hide them. > For the record, it took me almost an hour to update attoparsec to fix all the various regressions, or to put it more charitably changes, introduced in GHC 7.10. I have twenty-something other packages to go through. I don't keep track of the time sunk from release to release, but this feels somewhat worse than average. Basically, the more careful you are in writing a package, the more each update of GHC and base costs in nickel-and-dime tweaks to keep a build clean. It's not a very happy-making feedback loop. "Be a good citizen, and your reward is to spend *even more* time cleaning up!"
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