22 Mar
2014
22 Mar
'14
8:02 a.m.
On Sat, Mar 22, 2014 at 12:50:14PM +0100, martin wrote:
instance Show (WeekdayPattern v) where show wdp = show $ groupBy sameValue expanded where expanded = zip (map (at wdp) [0..6]) [0..6] sameValue x y = (fst x) == (fst y) [...] I tried inserting an (Eq v) => in various places of the class or data declaration, but the compiler either didn't like that or it did not solve the problem. There is no problem just writing a show-like method as in
What's wrong with instance (Show v, Eq v) => Show (WeekdayPattern v) where .... Tom PS It helps answerers if you can post the smallest *complete* code that demonstrates the problem, without commentary interspersed.