Maybe it is possible to do something In a google summer of code. Nothing as sophisticated as the Helium paper ("Scripting the Type Inference Process", but maybe a partial implementation of the techniques mentioned, so that the development can be enhanced in the future.
Maybe some kind of library that permits postprocessing of GHC errors and/or the identification of points in the current type checker where some kind of rules can be defined by the programmer can be the first step. 2013/4/23 Brent Yorgey <byor...@seas.upenn.edu> > On Tue, Apr 23, 2013 at 12:49:59PM +0200, Alberto G. Corona wrote: > > Hi > > > > I ever was worried about the barrier that the complexity of the Haskell > > errors impose to users of DSLs. Many DSLs look so simple that even > someone > > without knowledge of Haskell can make use of them for some domains. > > > > However when the program is compiled then al the monsters of the > > deep appear in the surface: polymorphisms, undefined instances, type > errors > > reported in a line produced by a type assumption in another, etc. This > is > > a problem for an industrial use of Haskell in the large scale. For > obvious > > reasons. > > Indeed. For example, in my experience this is a big problem for diagrams. > > > > > > > The question: Is it possible to develop a GHC extension that attach (or > > prepend) such an explanation to the ghc error? > > > > Or any other alternative that carry out the same functionality. > > Surely it is possible. I have wanted this too. I guess the majority > of the work would just be in coming up with a good, general design > which is useful but not too difficult to implement. If anyone wanted > to undertake such a project I would be happy to contribute some ideas. > > -Brent > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > -- Alberto.
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe