3 Aug
2006
3 Aug
'06
8:41 a.m.
On 8/3/06, John Meacham
does anyone else think this would be useful to provide?
module Data.Perhaps where
data Perhaps = No | Maybe | Yes deriving(Eq,Ord,Show,Read,Enum,Bounded)
instance Monoid Perhaps ... ...
Reminds me of Donald Knuth's type declaration: type enum { false, true, wow } bool; /Josef