[ghc-steering-committee] Proposal #592: Scoped kind variables in standalone kind signatures (recommend accept)

Adam Gundry adam at well-typed.com
Fri Feb 23 21:25:32 UTC 2024

I'm happy with acceptance.


On 19/02/2024 21:36, Eric Seidel wrote:
> All, I've only heard from SimonPJ, Arnaud, and Richard. Please voice your assent or dissent. Otherwise I will take silence as assent and accept the proposal this weekend.
> On Wed, Feb 14, 2024, at 15:33, Richard Eisenberg wrote:
>> Yes, looks good to me. This is a natural part of -XExtendedForAllScope.
>> Which, though I dislike, seems to be around for good (and admittedly is
>> quite convenient).
>> On Tue, Feb 13, 2024 at 11:39 AM Arnaud Spiwack <arnaud.spiwack at tweag.io> wrote:
>>> I haven't taken time to check that the specification that Vlad wrote is the same as that of -XExtendedForAllScope for type signatures and function definitions. But I trust that Vlad did his homework.
>>> This makes perfect sense to me, though I'm not sure this is worth spending time on, considering that we seem to be going in the direction to deprecate -XExtendedForAllScope.
>>> On Mon, 12 Feb 2024 at 23:39, Simon Peyton Jones <simon.peytonjones at gmail.com> wrote:
>>>> I support this too.
>>>> Simon
>>>> On Sat, 10 Feb 2024 at 03:10, Eric Seidel <eric at seidel.io> wrote:
>>>>> Dear Committee,
>>>>> Vlad has found what looks like a clear gap in the interaction between
>>>>> two extensions: -XStandaloneKindSignatures and -XExtendedForAllScope.
>>>>> I think it's quite obvious that under -XExtendedForAllScope the forall
>>>>> in a standalone kind signature should behave like the forall in a
>>>>> standalone type signature, i.e. it should scope over the definition
>>>>> as well.
>>>>> I recommend accepting this amendment to StandaloneKindSignatures.
>>>>> Eric
>>>>> https://github.com/ghc-proposals/ghc-proposals/pull/592
>>>>> https://github.com/int-index/ghc-proposals/blob/scoped-saks/proposals/0054-kind-signatures.rst#proposed-change-specification
>>>>> _______________________________________________

Adam Gundry, Haskell Consultant
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