Hi folks,

I implemented what I had in mind in https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3959. CI should turn green any hour now, so feel free to play with it if you want to.

With the wonderful https://github.com/mpickering/ghc-artefact-nix it will just be `ghc-head-from 3959`.




Cheers,


Sebastian


Am Di., 1. Sept. 2020 um 22:09 Uhr schrieb Joachim Breitner <mail@joachim-breitner.de>:

Am Dienstag, den 01.09.2020, 10:11 +0200 schrieb Sebastian Graf:
> > 2.) Another scenario that I'd really love to see supported with
> > COMPLETE pragmas is a way to use | notation with them like you can
> > with MINIMAL pragmas.
>
> (2) is a neat idea, but requires a GHC proposal I'm not currently
> willing to get into. I can also see a design discussion around
> allowing arbitrary "formulas" (e.g., not only what is effectively
> CNF).
>
> A big bonus of your design is that it's really easy to integrate into
> the current implementation, which is what I'd gladly do in case such
> a proposal would get accepted.

in the original ticket where a COMPLETE pragma was suggested (
https://gitlab.haskell.org/ghc/ghc/-/issues/8779) the ability to
specify arbitrary boolean formulas was already present:

“So here is what I think might work well, inspired by the new MINIMAL
pragma: … The syntax is essentially the same as for MINIMAL, i.e. a
boolean formula, with constructors and pattern synonyms as atoms. In
this case”

So one _could_ say that this doesn’t need a proposal, because it would
just be the implementation finishing the original task ;-)


Cheers,
Joachim

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


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