The preprocessor tool of Noel Winstanley and my suggestion are actually
two orthogonal issues.
My suggestion is to separate `deriving' from `newtype' and `data'.
Noel's preprocessor allows the derivation of classes besides Eq, Ord,
Enum, Bounded, Show, and Read.
The first requires a small change of the Haskell language,
the later makes Haskell programs dependent on this preprocessor.
In my opinion the later raises the question, if `deriving' should no
longer be a normal Haskell construct but always be treated by a
preprocessor. This should however be discussed when Noel has released
his preprocessor and some experience with its use has been gained.
Olaf
--
OLAF CHITIL, Lehrstuhl fuer Informatik II, RWTH Aachen, 52056 Aachen,
Germany
Tel: (+49/0)241/80-21212; Fax: (+49/0)241/8888-217
URL: http://www-i2.informatik.rwth-aachen.de/~chitil/
