[ghc-steering-committee] #511 Deep Subsumption, recommendation: accept

[Joachim Breitner]

Hi,

Am Dienstag, dem 21.06.2022 um 11:45 +0100 schrieb Simon Marlow:
> > Slight digression, but does Cabal even allow specifying bounds on the
> > compiler implementation? If you put this into the build-depends it
> > might have that effect, but it will also depend on ghc-the-library, not
> > what people usually do.
> 
> Yes, you can do this (stolen from one of my .cabal files):
> 
>     if impl(ghc >= 8.8)
>       buildable: True
>     else
>       buildable: False

just in case someone reads our conversation here, TIL that the using
buildable is not quite correct, and should probably be

    if impl(ghc < 8.8)
      build-depends: unbuildable <0

according to Oleg in 
https://github.com/haskell/mtl/issues/138#issuecomment-1369068398

Cheers,
Joachim 


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