Tue, 30 Oct 2001 09:34:26 +0100
Wolfgang Jeltsch wrote (on 29-10-01 23:43 +0100):
> you cannot use sections with types and (->). Furthermore the variable must
> begin with a lowercase letter. So you have to write
> instance Functor (->) a where.
Erp, I said that the Functor class has arity *. Actually, it has arity 1
(i.e., it is a unary relation on types), with the argument being of kind
*->*. This is one of the infelicities of the class system.
Frank Atanassow, Information & Computing Sciences, Utrecht University
Padualaan 14, PO Box 80.089, 3508 TB Utrecht, Netherlands
Tel +31 (030) 253-3261 Fax +31 (030) 251-379