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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