A more useful Monoid instance for Data.Map

[Edward Kmett]

And then another 2 years before I can use it again in code that I have to
maintain that will need to be compatible with the GHC version released in
the meantime.

The 3 years I'd be unable to use it weigh strongly against it for me.

-1 from me.

On Tue, Mar 12, 2013 at 1:18 PM, Ian Lynagh <ian at well-typed.com> wrote:

> On Tue, Mar 12, 2013 at 11:06:22AM -0400, Ben Gamari wrote:
> >
> >   2) We decide it is acceptable to break users code multiple times, drop
> >      the Monoid instance and reintroduce the new instance after some
> >      delay. The length of this delay could range from no delay at all
> >      (allowing folks to quickly move to the new instance, although
> >      potentially unwittingly) to several months (hoping that most users
> >      will realize the change during this window).
>
> If we're talking about containers, if you want a meaningful delay, you'd
> probably need at least one GHC+HP major release with no instance, and
> and then the new instance would come with the next GHC+HP major release.
> i.e. the delay would be at least a year.
>
>
> Thanks
> Ian
>
>
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