Overlapping and incoherent instances

[Krzysztof Skrzętnicki]

I think it may also lead to cleaner code. I would rather write a single
section like this:

#if NEW_GHC
{-# bunch of OVERLAPPABLE declarations #-}
#endif

at the start of the file rather than have to insert a lot of CPP-guarded
pragmas later. But it may be seen as an editor/IDE issue and bikeshedding
on the whole.

--
Krzysztof


On Tue, Jul 29, 2014 at 12:48 PM, Johan Tibell <johan.tibell at gmail.com>
wrote:

> On Tue, Jul 29, 2014 at 12:37 PM, Daniel Trstenjak
> <daniel.trstenjak at gmail.com> wrote:
> >
> > On Tue, Jul 29, 2014 at 12:02:19PM +0200, Johan Tibell wrote:
> >> What's the rationale to not require
> >>
> >> {-# OVERLAPPING Show [Char] #-}
> >>
> >> here? Perhaps it's too annoying to have to repeat the types?
> >
> > This one might be written at the top of the file, so it would be easier
> > to overlook it, than having it directly at the instance declaration,
> > which seems to be one of the major points for OVERLAPPING and
> OVERLAPPABLE.
>
> The same could be said for e.g. INLINE. The extra flexibility is nice
> to have (e.g. because you can opt to put the pragma after the
> declaration, to de-emphasize it.)
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