26 May
2011
26 May
'11
6:10 a.m.
The problem is the monomorphism restriction: http://www.haskell.org/haskellwiki/Monomorphism_restriction http://www.haskell.org/ghc/docs/7.0.2/html/users_guide/monomorphism.html http://stackoverflow.com/questions/tagged/monomorphism-restriction http://www.cs.auckland.ac.nz/references/haskell/haskell-intro-html/pitfalls.... This kicks everyone in the butt at least once. It would be good if GHC could point it out, as mine (6.12.3) just complains about no instance. Maybe GHC7 does point it out. It's a waste of people's time otherwise.