On Fri, Dec 23, 2005 at 12:12:49PM +0100, Udo Stenzel wrote:
Jeff.Harper@handheld.com wrote:
{- This code is works with Glasgow, ghci, with these options: -fglasgow-exts -fallow-undecidable-instances -fno-monomorphism-restriction -fallow-incoherent-instances -}
First off, try lighter weapons first. Be switching on all possible extensions you're also getting worse error reporting and more unexpected interactions. -fglasgow-exts and -fallow-overlapping-instances should be enough.
Indeed, I think this is a very important point, and one of the reasons I'd like to see Haskell 06 come out with a reasonable set of extensions that are known to work together well. I've gone down this path before, adding extension after extension, and it just leads to more and more confusion--since I don't understand what the extensions do, or how they change the language! -- David Roundy http://www.darcs.net