[ANNOUNCE] GHC 8.2.1 release candidate 2

Alberto Valverde alberto at toscat.net
Fri May 26 13:41:43 UTC 2017

It's most certainly not a Cabal issue. The problem only manifests itself on
packages which I have applied Nix's "doJailbreak", which mangles the .cabal
file in order to remove bounds. Maybe the format of the .cabal has changed
slightly and the parser it uses trips up? Anyway, sorry for the noise

On Fri, May 26, 2017 at 11:11 AM, Alberto Valverde <alberto at toscat.net>

> Hi Ryan,
> Some preogress... The cabal issues I reported seem more of a nix issue but
> I'm not sure what is causing them. FWIW, nix does not use cabal-install at
> all but instead compiles the Setup.hs script and runs that.
> The weird thing is that i'm trying to reproduce what the nix
> haskell-package builder [1] does and the problem I described (no Main.hs
> could be found) does not occur but instead the Main.hs module fails to
> compile due to an unrelated error. So it seems that, somehow, the unrelated
> compile error is being mistaken by a lack of module.
> Even weirder is that the snap-server.cabal says that the failing
> executables should only be built when flags are enabled (which are disabled
> by default) but they are being built anyway when nix calls Setup, even when
> I explicitly disable them via nix. The nix build log [2] even says that the
> flags (build-pong and build-testserver) are disabled! However, If I
> manually execute Setup the configure flags are honored.
> I'll continue to investigate to try and make some sense of this but I
> think it's not cabal's fault so feel free to ignore me for the meantime.
> I'll chime back if/when I find it is an issue with the new Cabal.
> Thanks,
> Alberto
> [1] https://github.com/NixOS/nixpkgs/blob/master/pkgs/
> development/haskell-modules/generic-builder.nix
> [2] https://gist.github.com/albertov/eee8af04eeca9f946ab107d416256a
> 05#file-gistfile1-txt-L21
> On Tue, May 23, 2017 at 6:28 PM, Ryan Scott <ryan.gl.scott at gmail.com>
> wrote:
>> Alberto,
>> > I've manage to reproduce the CK bug without any external dependencies
>> and
>> > opened a ticket with an attached module that fails to compile with
>> > 8.2.1-rc2 (w/o explicit KindSignature) but compiles fine with 8.0.2.
>> Thanks for doing this!
>> > Will hopefully follow up soon with the Cabal issues I'm experiencing
>> One thing that might be useful to do is to invoke Cabal with high
>> verbosity (e.g., -v3) and post the logs somewhere. I wouldn't be surprised
>> if Nix was passing some uncommonly used flags that have regressed in recent
>> versions of Cabal.
>> Ryan S.
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