foldable flexible bridges (putting foldable+traversable in prelude) Re: Burning bridges#

Ian Lynagh ian at
Sat May 25 16:01:39 CEST 2013

On Fri, May 24, 2013 at 08:55:55AM +0800, Conrad Parker wrote:
> I'd much prefer to have all these little things (type hierarchy
> cleanup, prelude generalisation) lumped together:
>   * available in a ghc release but off-by-default; that way library
> authors and commercial users can test the changes without hacking ghc
>   * default in the following ghc release, but disableable by a flag

To do either of these you'd need a completely different set of libraries
for the old vs the new. It would be simpler just to install 2 different
GHCs, one with the old and one with the new.

Ian Lynagh, Haskell Consultant
Well-Typed LLP,

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