[isabelle-dev] Tweak Haskell output for future Haskell compatibility.

[Makarius]

On Tue, 8 May 2012, Makarius wrote:

> I did not find these ancient mails in my folders from the mid-1990-ies on the 
> spot.

At last, I've found my mail folders before the year 1996.  On 29-Sep-1994 
someone was pointing out that "latest" Gofer and Haskell would now support 
type class constraints in datatypes, observing this as a current trend in 
functional programming, and demanding that Isabelle/HOL would have to 
follow :-)

This was long before I got myself involved in the datatype package, and we 
added the support for sort constraints in Stefan's version for other 
reasons than following other languges trends.

I can tell further stories about the domain variant by David von Oheimb, 
but maybe I should stop the history session here.


 	Makarius