Ashley writes
| > I was hoping to do something similar for 'do' notation by redefining
| > (>>), (>>=) etc., but unfortunately GHC is quite insistent
| that 'do' notation quite specifically refers to GHC.Base.Monad
Dylan replies
| I'm surprised that ghc uses the fromInteger and fromRational
| that are in scope; I thought there was general agreement that
| it should use the Prelude.from{Integer,Rational} in scope.
Ashley is referring to a GHC extension. Normally, GHC uses
Prelude.fromInteger etc, regardless of what is in scope. But if you
say -fno-implicit-prelude, GHC will instead use whatver fromInteger
is in scope. (This is documented in the manual.)
Ashley's question, as I understand is whether something similar
could be done for monads.
Answer: I think so, without much bother. I'm beavering away on
a Haskell workshop paper at the moment, but ping me in a fortnight
to do it.
Simon
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