'deriving Tree (Eq,Ord)'

Ross Paterson ross at soi.city.ac.uk
Tue Apr 4 08:55:09 EDT 2006

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.

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