[ANNOUNCE] GHC 8.2.1 release candidate 2

Ryan Scott ryan.gl.scott at gmail.com
Fri May 19 17:39:34 UTC 2017

A follow-up:

* The fact that the fingertree test suite doesn't terminate is an
occurrence of a known bug, GHC Trac #13429 [1].
* I just ran the lens test suite with GHC 8.2, and it terminated [2]. It
does take a while, though, sound it's understandable that one would think
it loops forever if you don't have the patience to let it finish :)

Again, I'm not able to reproduce the ConstraintKinds or Cabal regressions
you reported, so it would be tremendously helpful if you could submit bug
reports explaining how to trigger those issues. Thanks!

Ryan S.
[1] https://ghc.haskell.org/trac/ghc/ticket/13429#comment:16
[2] https://travis-ci.org/ekmett/lens/jobs/231611970

On Fri, May 19, 2017 at 9:16 AM, Ryan Scott <ryan.gl.scott at gmail.com> wrote:

> Hi Alberto. Thanks for the very detailed report!
> > - A weird kind error when using ConstraintKinds in a propietary package
> > which didn't manifest itself with ghc < 8.2:
> >
> > ...
> >
> > Is this expected behaviour?
> > Should I try to isolate and open a ticket?
> This looks like a proper bug to me. Can you minimize the example a submit
> a bug report at https://ghc.haskell.org/trac/ghc/newticket for this?
> Thanks!
> > - I had to disable the tests for two packages since they seem to "hang"
> >  (ie: they never finish running and don't seem to consume any CPU time).
> > These packages are lens-4.15.1 and fingertree- Maybe it's a Nix
> > environmental issue, I'm not sure. Can anyone reproduce this?
> The fact that the lens tests run forever sounds unusual to me, as the lens
> repo has been running regression tests with GHC 8.2 for a while with no
> observed slowdowns. I'll double-check soon just to be sure, though.
> However, I can confirm that the fingertree tests appear to loop forever at
> runtime with GHC 8.2 (as opposed to GHC 8.0, where they finish in about 7.5
> seconds). This is certainly not a good thing, so I'll try to investigate
> this more. Thanks for noticing this.
> > - I can't manage to install several packages which include executables
> > (namely, update-nix-fetchgit and snap-server, for the moment) because
> Cabal
> > says that it cannot find the source for the main module of the
> executables:
> >
> > "Setup: can't find source for Main in ."
> >
> > It seems that the "hs-source-dir" directive in the .cabal file is not
> being
> > honored. Maybe a Nix-only issue? Can anyone reproduce this? Any ideas on
> > how can I fix it?
> I can't reproduce this issue, at least with update-nix-fetchgit-
> (by using `cabal install` to install it). Can you give more detailed
> instructions on how to trigger this error?
> Ryan S.
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