Data.Monoid + collections = trouble

[Iavor Diatchki]

Hi,
Just out of curiosity, what do people use the Monoid instances for?
-Iavor

> ...
> C or A would either be good IMHO from a not messing up existing code
> point of view. Monoid is so useful, I'd prefer C and (optionally) A
> actually. Since the instance can't be expressed in hugs, the fact the
> implementations are different is unobservable and hence okay in some
> sense. (handwavy)
>         John