On 06/12/2010 17:47, Stephen Tetley wrote:
Me thinks there's more value that "the next language after Haskell" might have such a hierarchy than Haskell itself.
At Haskell 1.3 I think there was one text book (Davie), possibly none at Haskell 1.4 and many at Haskell 98. The value of invalidating 12 or so years of documentation for "logic" seems somewhat questionable from my perspective. If either proposal were limited to just adding class constraints to get the desired hierarchy rather than eliminating methods, they might have more legs...
.NET and Java are used in billions of line of production code and have thousands of books written about them, but new versions often obsolete what would have previously been recommended practice. Breaking legacy documentation is generally the least of anyone's worries when moving a language forward. As for breaking code, new versions of GHC often break a bunch of packages (see the build logs on hackage), although the breakage would be more pervasive in this case. As for eliminating methods, I'm only proposing that they be moved into a legacy module (as was done with old-time and OldException), so the classic functions will still be available.