Hello Edward, Shouldn't we publicize this trick? Perhaps in the changelog?
Edward Excerpts from Edward Kmett's message of 2015-01-20 15:22:57 -0800: > Building -Wall clean across this change-over has a big of a trick to it. > > The easiest way I know of when folks already had lots of > > import Data.Foldable > import Data.Traversable > > stuff > > is to just add > > import Prelude > > explicitly to the bottom of your import list rather than painstakingly > exclude the imports with CPP. > > This has the benefit of not needing a bunch of CPP to manage what names > come from where. > > Why? GHC checks that the imports provide something 'new' that is used by > the module in a top-down fashion, and you are almost suredly using > something from Prelude that didn't come from one of the modules above. > > On the other hand the implicit import of Prelude effectively would come > first in the list. > > It is a dirty trick, but it does neatly side-step this problem for folks in > your situation. > > -Edward > > On Tue, Jan 20, 2015 at 6:12 PM, Bryan O'Sullivan <b...@serpentine.com> > wrote: > > > > > On Tue, Jan 20, 2015 at 3:02 PM, Herbert Valerio Riedel <h...@gnu.org> > > wrote: > > > >> I'm a bit confused, several past attoparsec versions seem to build just > >> fine with GHC 7.10: > >> > >> https://ghc.haskell.org/~hvr/buildreports/attoparsec.html > >> > >> were there hidden breakages not resulting in compile errors? > >> Or are the fixes you mention about restoring -Wall hygiene? > >> > > > > I build with -Wall -Werror, and also have to maintain the test and > > benchmark suites. > > _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users