31 Jan
2007
31 Jan
'07
10:36 p.m.
On 1/31/07, Bulat Ziganshin
i hope that now my idea is clear
Yes - you've reiterated Wadler's original design, with an automatic creation of a type class. Erwig and Peyton-Jones, _Pattern Guards and Transformational Patterns_ (http://research.microsoft.com/~simonpj/Papers/pat.htm) mentions problems with equational reasoning raised by this approach. /g -- It is myself I have never met, whose face is pasted on the underside of my mind.