A more useful Monoid instance for Data.Map

Johan Tibell johan.tibell at gmail.com
Tue Mar 12 16:09:40 CET 2013

On Tue, Mar 12, 2013 at 8:06 AM, Ben Gamari <bgamari.foss at gmail.com> 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).

Before we even consider breaking user code we should see how much code will
be broken. If someone with spare cycles could download a copy of Hackage
and grep for uses of mappend on Data.Map that would be great.
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