Re: deriving

On Tue, 21 Aug 2001, Tom Pledger wrote: (snip)

http://research.microsoft.com/Users/simonpj/Papers/derive.htm

Aha, thank you very much. This explains a lot - I had assumed that Haskell must already have had something of the sort that nobody had told me about, but apparently not! I again tripped over my assumptions. (-: So, as Haskell 98 stands, you _can't_ make your own type classes that types can 'derive' from. It is interesting to see the extensions that people have been proposing - I wonder what the next version of Haskell will look like, and when. (-: -- Mark