Advice sought for 6.9 and Arrow/Category

Conal Elliott conal at
Tue Jul 15 10:43:11 EDT 2008

All code that defines Arrow instance breaks, because (>>>) is not a method
of Arrow.  I have a lot of such instances, so I'm now adding #if directives
to test for ghc-6.9 or later.  - Conal

On Mon, Jul 14, 2008 at 8:38 PM, Don Stewart <dons at> wrote:

> conal:
> >    I want to use ghc-6.9 for improved support of type families, but I see
> >    that the change to the Arrow interface breaks some of my libraries
> (since
> >    (>>>) is no longer a method of Arrow).  Will this change really be in
> (>>>) has been reexported from Control.Category through Arrow for a few
> months.  Does that fix things, or is your code still broken?
> -- Don
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