On Apr 28, 2008, at 16:22 , Fraser Wilson wrote:
instance (Num a) => ValueClass a where fromValue (Value n) = fromInteger n
What I'm really confused by is the response to instance (Num a) => ValueClass a -- what I am trying to say is "if a is an instance of Num, then can be an instance of ValueClass too, and here's how".
The format is instance [context =>] classname instance. Your classname is ValueClass. Your instance is a. a is not of the form (T a1 ... an). (How to fix it? Not sure, and am trying to get myself out of here and on the road :) -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH