On Tue, 2 Nov 2010, Don Stewart wrote:
Note that you've added MonadCatchIO as a dependency to cgi, which is *not* part of the platform. This will prevent cgi being upgraded in the next HP release.
Yeah, I added that in March with cgi 3001.1.8, in an effort to improve cgi’s exception handling situation [1]. Unfortunately, I learned a few weeks ago that MonadCatchIO is actually subtly broken [2], and although this problem does not affect cgi’s use of MonadCatchIO (with ReaderT and WriterT), it did throw a bit of a wrench into my plan to propose MonadCatchIO for addition to HP. In fact, I have been working on a replacement for the MonadCatchIO functionality [3], which I hope will be awesome and could eventually end up in the transformers library. I plan on uploading a package and announcing it within a day or so. But I’m not sure whether it’s realistic to expect the community to be confident in the new package before the next HP freeze, so maybe the best option for now is to backport the fix and upload a cgi 3001.1.7.4? [1] http://www.haskell.org/pipermail/libraries/2010-March/013169.html [2] http://www.haskell.org/pipermail/haskell-cafe/2010-October/084890.html [3] http://docs.yesodweb.com/blog/invertible-monads-exceptions-allocations/#disq... (see comments) Anders