[Haskell-cafe] [ANNOUNCE] GHC 8.2.1 available

[Geraldus]

Thank you!

чт, 27 июл. 2017 г. в 23:21, Evan Laforge <qdunkan at gmail.com>:

> Thanks for the reply.  I got cabal-install from
> https://github.com/haskell/cabal/ and assumed it was the latest
> version... but now that I look carefully I see it has a 2.0 branch.  I
> compiled it and I don't get that confusing "parse error" any more.  It
> looks like a nicer error message in general too (except still missing
> some spaces, specifically "After searching the rest of the dependency
> tree exhaustively, these were the goals I've had most trouble
> fulfilling: karya, ekgTrying configure anyway."), so that's probably
> thanks to the solver improvements in 2.0.
>
> Since it's apparently just a bug in older cabal-installs I guess I
> won't bother trying to find it.
>
> On Wed, Jul 26, 2017 at 7:01 PM, Wolfgang Jeltsch
> <wolfgang-it at jeltsch.info> wrote:
> > Hi!
> >
> > I ran into the same problem.
> >
> > Apparently, we need cabal-install 2.0, which has not been released yet.
> > A preliminary solution is to use the development version from the 2.0
> > branch. Binary packages can be found at
> >
> >
> http://ppa.launchpad.net/hvr/ghc/ubuntu/pool/main/c/cabal-install-2.0/  ,
> >
> > for example. It is possible to extract the cabal-install executable from
> > these packages, so that it can be installed without using some Linux
> > distribution package manager.
> >
> > All the best,
> > Wolfgang
> >
> > Am Mittwoch, den 26.07.2017, 18:45 -0700 schrieb Evan Laforge:
> >> This seems like a silly question, but how can we install cabal-install
> >> now?  The latest hackage version 1.24.0.2 has Cabal (>=1.24.2 &&
> >> <1.25), but it looks like ghc Cabal is now at 2.*.
> >>
> >> I ran into this because if I get:
> >>
> >> % cabal install --only-dependencies
> >> Resolving dependencies...
> >> cabal: internal error when reading package index: failed to parse
> >> .cabal
> >> fileThe package index or index cache is probably corrupt. Running
> >> cabal update
> >> might fix it.
> >>
> >> It seems to be triggered by having 'ekg' in the deps list, since if I
> >> take it out then I get some other errors about packages not liking the
> >> new base, which is true.  'ekg' also doesn't like the new base, but
> >> "internal error" is not the clearest way to express that :)
> >>
> >> It's frustrating that cabal-install still doesn't report the parse
> >> error, even though the parse function returns one.  It just ignores
> >> the ParseFailed case.  I was going to try fixing it and send a pull
> >> request when I ran into the Cabal 2.* problem.
> >>
> >> On Wed, Jul 26, 2017 at 7:15 AM, Ben Gamari <ben at smart-cactus.org>
> >> wrote:
> >> >
> >> > Wolfgang Jeltsch <wolfgang-it at jeltsch.info> writes:
> >> >
> >> > >
> >> > > Am Samstag, den 22.07.2017, 23:03 -0400 schrieb Ben Gamari:
> >> > > >
> >> > > > In addition, there are a number of new features,
> >> > > >
> >> > > >  * A new, more type-safe type reflection mechanism
> >> > > >
> >> > > >  * The long-awaited Backpack module system
> >> > > >
> >> > > >  * Deriving strategies to disambiguate between GHC's various
> >> > > > instance
> >> > > >    deriving mechanisms
> >> > > >
> >> > > >  * Unboxed sum types, for efficient unpacked representation of
> >> > > > sum
> >> > > >    data types
> >> > > >
> >> > > >  * Compact regions, allowing better control over garbage
> >> > > > collection
> >> > > >    in the presence of large heaps containing many long-lived
> >> > > > objects.
> >> > > >
> >> > > >  * Colorful messages and caret diagnostics for more legible
> >> > > > errors
> >> > > >
> >> > > > A more thorough list of the changes in this release can be found
> >> > > > in
> >> > > > the release notes,
> >> > > >
> >> > > >   https://haskell.org/ghc/docs/8.2.1/docs/html/users_guide/8.2.1
> >> > > > -notes.html
> >> > > It seems that the release notes mention the new type reflection
> >> > > mechanism und colorful messages only in the “Highlights” section,
> >> > > not in
> >> > > the “Full details” section, and that they do not mention the
> >> > > Backpack
> >> > > module system and unboxed sums at all.
> >> > >
> >> > Yes, indeed these were oversights. They are fixed in the ghc-8.2
> >> > branch
> >> > and I will try to push newly generated documentation shortly.
> >> >
> >> > Cheers,
> >> >
> >> > - Ben
> >> >
> >> > _______________________________________________
> >> > Glasgow-haskell-users mailing list
> >> > Glasgow-haskell-users at haskell.org
> >> > http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-use
> >> > rs
> >> >
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