Enabling TypeHoles by default

Johan Tibell johan.tibell at gmail.com
Tue Jan 14 16:44:35 UTC 2014

I can make another cabal release if needed, if someone submits a pull
request with the right fix (i.e. add TypedHoles with TypeHoles as a

On Tue, Jan 14, 2014 at 5:33 PM, Austin Seipp <austin at well-typed.com> wrote:

> At the very least, Type(d)Holes would never appear explicitly since it
> would be enabled by default. But it might be turned off (but I don't
> know who would do that for the most part.) Cabal at least might still
> need an update.
> In any case, Herbert basically summed it up: the time window is kind
> of close, and we would need to re-release/redeploy a few things most
> likely. I really think it mostly depends on the Cabal team and what
> their priorities are. I've CC'd Duncan and Johan for their opinions.
> On Tue, Jan 14, 2014 at 10:27 AM, Herbert Valerio Riedel <hvr at gnu.org>
> wrote:
> > Hi,
> >
> > On 2014-01-14 at 17:14:51 +0100, David Luposchainsky wrote:
> >> On 14.01.2014 17:07, Austin Seipp wrote:
> >>> We probably won't change the name right now however. It's already
> >>> been put into Cabal (as a recognized extension,) so the name has
> >>> propagated a slight bit. We can however give it a new name and
> >>> deprecate the old -XTypeHoles in the future. Or, we could change
> >>> it, but I'm afraid it's probably a bit too late in the cycle for
> >>> other devs to change.
> >>
> >> Removing a name later on is more time-consuming, with or without
> >> deprecation. People get used to the "wrong" name and stop caring, but
> >> I can already picture the "type holes are really typed holes"
> >> discussions on IRC. I'm strongly in favour of introducing the new name
> >> (and the deprecation for the synonym) as early as possible. This
> >> change should not be very extensive anyway, so why not slip it in?
> >
> > Well, as Austin hinted at, this would also require a Cabal-1.18.x
> > release in time for the final 7.8, and a recompile of Hackage to pick it
> > up so that people can start using the new 'TypedHoles' token in their
> > .cabal files... so there's a bit of coordination required to make this
> > happen in a timely manner... Or put differently, somebody has to care
> > enough to invest some time and pull this through :-)
> >
> > Cheers,
> >   hvr
> >
> --
> Regards,
> Austin Seipp, Haskell Consultant
> Well-Typed LLP, http://www.well-typed.com/
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