Re: [ghc-steering-committee] a plea for PolyKinds

The truth is that (Type :: Type) is true no matter what (though you'd need KindSignatures for GHC to accept that). The features that were previously -XTypeInType have been moved into -XPolyKinds (and a few in -XDataKinds), because there seemed to be very little reason to keep the two extensions separate. PolyKinds essentially allows two things: it allows users to write variables and other constructs (like `forall`) in kinds, and it allows GHC to do kind-generalization. But nothing about -XPolyKinds really changes the relationship between types and kinds. Richard

On Dec 3, 2020, at 2:53 PM, Iavor Diatchki wrote:

Oh? Perhaps I am confused, if we can have PolyKinds without TypeInType, I'd be happy to change my vote. My understanding was that basically `TypeInType` got renamed to `PolyKinds` but I might be confused.

-Iavor

On Thu, Dec 3, 2020 at 11:50 AM Alejandro Serrano Mena mailto:trupill@gmail.com> wrote: But PolyKinds does not require TypeInType, according to the docs [https://downloads.haskell.org/ghc/latest/docs/html/users_guide/glasgow_exts.... https://downloads.haskell.org/ghc/latest/docs/html/users_guide/glasgow_exts....] it is in fact the other way around: TypeInType implies PolyKinds. Of course, the fact that kinds and types are unified may leak somehow, but I have a hard time figuring out an example of such.

El jue, 3 dic 2020 a las 18:51, Iavor Diatchki (mailto:iavor.diatchki@gmail.com>) escribió: I would totally support that if PolyKinds was implemented without requiring TypeInType, but with the current design for me this is a solid `no`.

On Thu, Dec 3, 2020 at 9:48 AM Joachim Breitner mailto:mail@joachim-breitner.de> wrote: Hi,

Am Donnerstag, den 03.12.2020, 16:40 +0000 schrieb Richard Eisenberg:

...

Vote for PolyKinds!

convinced.

Cheers, Joachim -- Joachim Breitner mail@joachim-breitner.de mailto:mail@joachim-breitner.de http://www.joachim-breitner.de/ http://www.joachim-breitner.de/

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