15 Nov
2012
15 Nov
'12
4:19 a.m.
On Wed, 14 Nov 2012, Brent Yorgey wrote:
Precisely. See edwardk's package
http://hackage.haskell.org/package/semigroupoids
which defines this and many other related things.
I see, what I need is the Apply class from that package. Fortunately Data.Map is already an instance of the Apply class.