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

[Eric Seidel]

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
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>> 
>> 
>> -- 
>> Arnaud Spiwack
>> Director, Research at https://moduscreate.com and https://tweag.io.
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