24 May
2011
24 May
'11
10:13 a.m.
+1 Excerpts from Ross Paterson's message of Tue May 24 10:08:14 -0400 2011:
The Haskell' committee decided to remove datatype contexts from the language:
http://www.haskell.org/pipermail/haskell-prime/2011-January/003335.html
(though this doesn't seem to be in the Report yet.)
In the base package there are 4 of these:
Data/Complex.hs:data (RealFloat a) => Complex a GHC/Arr.lhs:data Ix i => Array i e GHC/Real.lhs:data (Integral a) => Ratio a = !a :% !a deriving (Eq) Control/Arrow.hs:newtype ArrowApply a => ArrowMonad a b = ArrowMonad (a () b)
As far as I know, removing them won't break any code that compiles now, so let's do it.