RE: deriving Read and Show
| When I use deriving Read and Show on many datatypes, | both ghc and hugs don't work. Your program defines 1000 data types, each of which has derived Show and Read. The latter take a fair amount of code each to do, so GHC gets indigestion. If you give it enough heap it'll probably work. We should probably try to make GHC take less space for data type decls, because this does come up every now and again, but it's not high on the agenda just now. (If lots of other people get bitten by this, please tell us and we'll move it up.) Simon
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Misleading error message
The following error message might be a bit misleading ;-) None of the type variable(s) in the constraint `C a' appears in the type `a -> b' In the type signature for `op' Here is the source > class C a where > op :: (C a) => a -> b which is not legal Haskell 98 (cf page 45: "the cx_i may not constrain u"). BTW Hugs 98 silently accepts the program. Cheers, Ralf
