Enabling TypeHoles by default

Austin Seipp austin at well-typed.com
Tue Jan 14 16:33:48 UTC 2014

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


Austin Seipp, Haskell Consultant
Well-Typed LLP, http://www.well-typed.com/

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