Proposal: Add IsString and Monoid instances for Doc

[Bas van Dijk]

On Sun, Oct 24, 2010 at 5:38 PM, Bas van Dijk <v.dijk.bas at gmail.com> wrote:
> On Sun, Oct 24, 2010 at 3:25 PM, Thomas Schilling
> <nominolo at googlemail.com> wrote:
>> Did you test how many packages this would break, i.e., how many
>> packages define their own instance for Monoid Doc?
>
> No, but I will try do that later today. Thanks for reminding me.

I just did an analysis on how many packages would break if we add
Monoid and IsString instances for Doc. There are no packages that
define a (orphaned) Monoid instance for Doc. There's one package that
adds an (orphaned) IsString instance for Doc: numerals (of which I'm a
maintainer and which uses the PVP so it won't break).

So I think we can go ahead an apply the patch attached to the ticket:
http://hackage.haskell.org/trac/ghc/ticket/4378

Regards,

Bas