'deriving Tree (Eq,Ord)'
benjamin.franksen at bessy.de
Tue Apr 4 12:08:13 EDT 2006
On Tuesday 04 April 2006 14:55, Ross Paterson wrote:
> On Tue, Apr 04, 2006 at 11:06:59AM +0400, Bulat Ziganshin wrote:
> > how about this old proposal?
> > http://www.cse.unsw.edu.au/~dons/haskell-1990-2000/msg00727.html
> (Making 'deriving' a separate declaration instead of a clause)
> Orphan instances are discouraged in the GHC libraries, so there might
> not be much support for adding a feature designed to permit orphan
> derived instances.
However, it would help programmers a lot, specialy library users. And it
would lift some of the burden that is currently on the library writer
to never forget to derive all possibly useful instances for public data
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