date:20211030

Re: regression in ghc / cabal integration in 9.2.1

2021-10-30 Thread Albert Y. C. Lai


On 2021-10-30 3:43 p.m., Brandon Allbery wrote:

Wasn't there specifically a new cabal version released to deal with
9.2.1? 3.4.1.0 / 3.6.2.0?


There is a double fault here.

Firstly yes, one should use a newer version of cabal-install that is 
known to support GHC 9.2.


So, 3.6.2.0 it is! But GHC 9.2.1 will also play a role...

$ cabal --version
cabal-install version 3.6.2.0
compiled using version 3.6.2.0 of the Cabal library

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 9.2.1

$ cabal install --lib vector
Resolving dependencies...
Build profile: -w ghc-9.2.1 -O1
In order, the following will be built (use -v for more details):
 - primitive-0.7.3.0 (lib) (requires download & build)
 - vector-0.12.3.1 (lib) (requires download & build)
[... success ...]

$ cat .ghc/x86_64-linux-9.2.1/environments/default
clear-package-db
global-package-db
package-db /home/trebla/.cabal/store/ghc-9.2.1/package.db
package-id ghc-9.2.1
package-id bytestring-0.11.1.0
package-id unix-2.7.2.2
package-id base-4.16.0.0
package-id time-1.11.1.1
package-id hpc-0.6.1.0
package-id filepath-1.4.2.1
package-id process-1.6.13.2
package-id array-0.5.4.0
package-id integer-gmp-1.1
package-id containers-0.6.5.1
package-id ghc-boot-9.2.1
package-id binary-0.8.9.0
package-id ghc-prim-0.8.0
package-id ghci-9.2.1
package-id rts
package-id terminfo-0.4.1.5
package-id transformers-0.5.6.2
package-id deepseq-1.4.6.0
package-id ghc-boot-th-9.2.1
package-id pretty-1.1.3.6
package-id template-haskell-2.18.0.0
package-id directory-1.3.6.2
package-id text-1.2.5.0
package-id 
vector-0.12.3.1-0ee0e7c1da5d41be6dd7eaa35c896ea170a10f2152c1d1b9be10fa606f06


$ ghci
GHCi, version 9.2.1: https://www.haskell.org/ghc/  :? for help
ghci>

(Foreshadowing: Wait a second! Where is the obligatory message "Loaded 
package environment etc etc"?)


ghci> import Data.Vector

: error:
Could not find module ‘Data.Vector’
Perhaps you meant Data.Functor (from base-4.16.0.0)

___
Glasgow-haskell-users mailing list
Glasgow-haskell-users@haskell.org
http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users

Re: regression in ghc / cabal integration in 9.2.1

2021-10-30 Thread Mikolaj Konarski

Hi George,

Have you looked at the ticket I gave you? Here's one linked from it
mentioning the topic of ghc-pkg compatibility with v2-install:
https://github.com/haskell/cabal/issues/6508

I'm afraid we don't have any systematic exposition of cabal history
with rationale for its major changes, but there's a changelog and the
commit log. If you'd like to contribute something better, please do.

Why the difference between GHC versions, I don't know, or whether
upgrading your cabal would help (I doubt it). Regarding your workflow,
perhaps ask around or look up in cabal tickets how other people do
this now? I never run ghc directly, so I don't know.

Best,
Mikolaj

On Sat, Oct 30, 2021 at 9:44 PM Brandon Allbery  wrote:
>
> Wasn't there specifically a new cabal version released to deal with
> 9.2.1? 3.4.1.0 / 3.6.2.0?
>
> On Sat, Oct 30, 2021 at 3:24 PM George Colpitts
>  wrote:
> >
> > Thanks for the quick response Mikolaj. Sorry for the confusion, with cabal 
> > install I did use --lib but accidentally omitted that in my original email. 
> > In 9.0.1 this results in a successful compilation but in 9.2.1 it does not 
> > thus I believe this is a regression.
> >
> > Here's the output I got in 9.2.1:
> >
> > bash-3.2$ cabal install vector --lib
> > Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports
> > 'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1
> > Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports
> > 'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1
> > Resolving dependencies...
> > Up to date
> > bash-3.2$ ghc buggc.hs
> > [1 of 1] Compiling Main ( buggc.hs, buggc.o )
> >
> >
> > buggc.hs:2:1: error:
> > Could not find module ‘Data.Vector’
> > Perhaps you meant Data.Functor (from base-4.16.0.0)
> > Use -v (or `:set -v` in ghci) to see a list of the files searched for.
> >   |
> > 2 | import Data.Vector
> >
> >
> > However I did figure out a workaround: cabal v1-install.
> >
> > As far as I can tell cabal (v2-) install breaks ghc-pkg and compilation. 
> > With cabal (v2-) install the workaround for ghc-pkg is to add the option 
> > "-f $HOME/.cabal/store/ghc-9.2.1/package.db" to the end of the command 
> > "ghc-pkg list". For compilation the workaround is to add "-package-db 
> > $HOME/.cabal/store/ghc-9.2.1/package.db" to the ghc-pkg. I don't understand 
> > why it was necessary for  cabal v2-install to be incompatible with cabal 
> > v1-install. Is there a link to any documentation and justification for 
> > these incompatible changes?
> >
> > Thanks again,
> > George
> >
> >
> >
> > On Sat, Oct 30, 2021 at 3:38 PM Mikolaj Konarski  
> > wrote:
> >>
> >> Hi George,
> >>
> >> Since many versions of cabal, `install` only installs executables, not
> >> libraries, so if that worked for you, you must have had an old version
> >> of cabal.
> >>
> >> Please see https://github.com/haskell/cabal/issues/6481 for some
> >> context and to help you find a new workflow that works for you
> >> (ideally, a standard one).
> >>
> >> Kind regards,
> >> Mikolaj
> >>
> >> On Sat, Oct 30, 2021 at 5:40 PM George Colpitts
> >>  wrote:
> >> >
> >> > Thanks Ben!
> >> >
> >> > There seems to be a regression in ghc / cabal integration in 9.2.1.
> >> >
> >> > In 9.2.1 if I do
> >> >
> >> > cabal install vector
> >> >
> >> > Compilation of a file containing
> >> >
> >> >
> >> > import Data.Vector
> >> >
> >> >
> >> > main = undefined
> >> >
> >> >
> >> > fails with
> >> >
> >> >  Could not find module ‘Data.Vector’
> >> > Perhaps you meant Data.Functor (from base-4.16.0.0)
> >> > Use -v (or `:set -v` in ghci) to see a list of the files searched 
> >> > for.
> >> >   |
> >> > 2 | import Data.Vector
> >> >   | ^^
> >> >
> >> > The preceding works on ghc 9.0.1
> >> >
> >> > Should I file a bug against Cabal?
> >> >
> >> > Thanks
> >> > George
> >> >
> >> > On Fri, Oct 29, 2021 at 12:54 PM Ben Gamari  wrote:
> >> >>
> >> >> Hi all,
> >> >>
> >> >> The GHC developers are very happy to at long last announce the
> >> >> availability of GHC 9.2.1. Binary distributions, source distributions,
> >> >> and documentation are available at
> >> >>
> >> >> https://downloads.haskell.org/ghc/9.2.1
> >> >>
> >> >> GHC 9.2 brings a number of exciting features including:
> >> >>
> >> >>  * A native code generation backend for AArch64, significantly speeding
> >> >>compilation time on ARM platforms like the Apple M1.
> >> >>
> >> >>  * Many changes in the area of records, including the new
> >> >>`RecordDotSyntax` and `NoFieldSelectors` language extensions, as well
> >> >>as Support for `DuplicateRecordFields` with `PatternSynonyms`.
> >> >>
> >> >>  * Introduction of the new `GHC2021` language extension set, giving
> >> >>users convenient access to a larger set of language extensions which
> >> >>have been long considered stable.
> >> >>
> >> >>  * Merging of `ghc-exactprint` into the GHC tree, providing
> >> >>

Re: regression in ghc / cabal integration in 9.2.1

2021-10-30 Thread Brandon Allbery

Wasn't there specifically a new cabal version released to deal with
9.2.1? 3.4.1.0 / 3.6.2.0?

On Sat, Oct 30, 2021 at 3:24 PM George Colpitts
 wrote:
>
> Thanks for the quick response Mikolaj. Sorry for the confusion, with cabal 
> install I did use --lib but accidentally omitted that in my original email. 
> In 9.0.1 this results in a successful compilation but in 9.2.1 it does not 
> thus I believe this is a regression.
>
> Here's the output I got in 9.2.1:
>
> bash-3.2$ cabal install vector --lib
> Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports
> 'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1
> Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports
> 'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1
> Resolving dependencies...
> Up to date
> bash-3.2$ ghc buggc.hs
> [1 of 1] Compiling Main ( buggc.hs, buggc.o )
>
>
> buggc.hs:2:1: error:
> Could not find module ‘Data.Vector’
> Perhaps you meant Data.Functor (from base-4.16.0.0)
> Use -v (or `:set -v` in ghci) to see a list of the files searched for.
>   |
> 2 | import Data.Vector
>
>
> However I did figure out a workaround: cabal v1-install.
>
> As far as I can tell cabal (v2-) install breaks ghc-pkg and compilation. With 
> cabal (v2-) install the workaround for ghc-pkg is to add the option "-f 
> $HOME/.cabal/store/ghc-9.2.1/package.db" to the end of the command "ghc-pkg 
> list". For compilation the workaround is to add "-package-db 
> $HOME/.cabal/store/ghc-9.2.1/package.db" to the ghc-pkg. I don't understand 
> why it was necessary for  cabal v2-install to be incompatible with cabal 
> v1-install. Is there a link to any documentation and justification for these 
> incompatible changes?
>
> Thanks again,
> George
>
>
>
> On Sat, Oct 30, 2021 at 3:38 PM Mikolaj Konarski  
> wrote:
>>
>> Hi George,
>>
>> Since many versions of cabal, `install` only installs executables, not
>> libraries, so if that worked for you, you must have had an old version
>> of cabal.
>>
>> Please see https://github.com/haskell/cabal/issues/6481 for some
>> context and to help you find a new workflow that works for you
>> (ideally, a standard one).
>>
>> Kind regards,
>> Mikolaj
>>
>> On Sat, Oct 30, 2021 at 5:40 PM George Colpitts
>>  wrote:
>> >
>> > Thanks Ben!
>> >
>> > There seems to be a regression in ghc / cabal integration in 9.2.1.
>> >
>> > In 9.2.1 if I do
>> >
>> > cabal install vector
>> >
>> > Compilation of a file containing
>> >
>> >
>> > import Data.Vector
>> >
>> >
>> > main = undefined
>> >
>> >
>> > fails with
>> >
>> >  Could not find module ‘Data.Vector’
>> > Perhaps you meant Data.Functor (from base-4.16.0.0)
>> > Use -v (or `:set -v` in ghci) to see a list of the files searched for.
>> >   |
>> > 2 | import Data.Vector
>> >   | ^^
>> >
>> > The preceding works on ghc 9.0.1
>> >
>> > Should I file a bug against Cabal?
>> >
>> > Thanks
>> > George
>> >
>> > On Fri, Oct 29, 2021 at 12:54 PM Ben Gamari  wrote:
>> >>
>> >> Hi all,
>> >>
>> >> The GHC developers are very happy to at long last announce the
>> >> availability of GHC 9.2.1. Binary distributions, source distributions,
>> >> and documentation are available at
>> >>
>> >> https://downloads.haskell.org/ghc/9.2.1
>> >>
>> >> GHC 9.2 brings a number of exciting features including:
>> >>
>> >>  * A native code generation backend for AArch64, significantly speeding
>> >>compilation time on ARM platforms like the Apple M1.
>> >>
>> >>  * Many changes in the area of records, including the new
>> >>`RecordDotSyntax` and `NoFieldSelectors` language extensions, as well
>> >>as Support for `DuplicateRecordFields` with `PatternSynonyms`.
>> >>
>> >>  * Introduction of the new `GHC2021` language extension set, giving
>> >>users convenient access to a larger set of language extensions which
>> >>have been long considered stable.
>> >>
>> >>  * Merging of `ghc-exactprint` into the GHC tree, providing
>> >>infrastructure for source-to-source program rewriting out-of-the-box.
>> >>
>> >>  * Introduction of a `BoxedRep` `RuntimeRep`, allowing for polymorphism
>> >>over levity of boxed objects (#17526)
>> >>
>> >>  * Implementation of the `UnliftedDataTypes` extension, allowing users
>> >>to define types which do not admit lazy evaluation ([proposal])
>> >>
>> >>  * The new [`-hi` profiling] mechanism which provides significantly
>> >>improved insight into thunk leaks.
>> >>
>> >>  * Support for the `ghc-debug` out-of-process heap inspection library
>> >>[ghc-debug]
>> >>
>> >>  * Significant improvements in the bytecode interpreter, allowing more
>> >>programs to be efficently run in GHCi and Template Haskell splices.
>> >>
>> >>  * Support for profiling of pinned objects with the cost-centre profiler
>> >>(#7275)
>> >>
>> >>  * Faster compilation and a smaller memory footprint
>> >>
>> >>  * Introduction of Haddock documentation support in

Re: regression in ghc / cabal integration in 9.2.1

2021-10-30 Thread George Colpitts

Thanks for the quick response Mikolaj. Sorry for the confusion, with cabal
install I did use --lib but accidentally omitted that in my original email.
In 9.0.1 this results in a successful compilation but in 9.2.1 it does not
thus I believe this is a regression.

Here's the output I got in 9.2.1:

bash-3.2$ cabal install vector --lib
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports
'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1
Warning: Unknown/unsupported 'ghc' version detected (Cabal 3.4.0.0 supports
'ghc' version < 9.1): /usr/local/bin/ghc is version 9.2.1
Resolving dependencies...
Up to date
bash-3.2$ ghc buggc.hs
[1 of 1] Compiling Main ( buggc.hs, buggc.o )

buggc.hs:2:1: error:
Could not find module ‘Data.Vector’
Perhaps you meant Data.Functor (from base-4.16.0.0)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
  |
2 | import Data.Vector

However I did figure out a workaround: cabal v1-install.

As far as I can tell cabal (v2-) install breaks ghc-pkg and compilation.
With cabal (v2-) install the workaround for ghc-pkg is to add the option "-f
$HOME/.cabal/store/ghc-9.2.1/package.db" to the end of the command "ghc-pkg
list". For compilation the workaround is to add "-package-db
$HOME/.cabal/store/ghc-9.2.1/package.db" to the ghc-pkg. I don't understand
why it was necessary for  cabal v2-install to be incompatible with cabal
v1-install. Is there a link to any documentation and justification for
these incompatible changes?

Thanks again,
George

On Sat, Oct 30, 2021 at 3:38 PM Mikolaj Konarski 
wrote:

> Hi George,
>
> Since many versions of cabal, `install` only installs executables, not
> libraries, so if that worked for you, you must have had an old version
> of cabal.
>
> Please see https://github.com/haskell/cabal/issues/6481 for some
> context and to help you find a new workflow that works for you
> (ideally, a standard one).
>
> Kind regards,
> Mikolaj
>
> On Sat, Oct 30, 2021 at 5:40 PM George Colpitts
>  wrote:
> >
> > Thanks Ben!
> >
> > There seems to be a regression in ghc / cabal integration in 9.2.1.
> >
> > In 9.2.1 if I do
> >
> > cabal install vector
> >
> > Compilation of a file containing
> >
> >
> > import Data.Vector
> >
> >
> > main = undefined
> >
> >
> > fails with
> >
> >  Could not find module ‘Data.Vector’
> > Perhaps you meant Data.Functor (from base-4.16.0.0)
> > Use -v (or `:set -v` in ghci) to see a list of the files searched
> for.
> >   |
> > 2 | import Data.Vector
> >   | ^^
> >
> > The preceding works on ghc 9.0.1
> >
> > Should I file a bug against Cabal?
> >
> > Thanks
> > George
> >
> > On Fri, Oct 29, 2021 at 12:54 PM Ben Gamari  wrote:
> >>
> >> Hi all,
> >>
> >> The GHC developers are very happy to at long last announce the
> >> availability of GHC 9.2.1. Binary distributions, source distributions,
> >> and documentation are available at
> >>
> >> https://downloads.haskell.org/ghc/9.2.1
> >>
> >> GHC 9.2 brings a number of exciting features including:
> >>
> >>  * A native code generation backend for AArch64, significantly speeding
> >>compilation time on ARM platforms like the Apple M1.
> >>
> >>  * Many changes in the area of records, including the new
> >>`RecordDotSyntax` and `NoFieldSelectors` language extensions, as well
> >>as Support for `DuplicateRecordFields` with `PatternSynonyms`.
> >>
> >>  * Introduction of the new `GHC2021` language extension set, giving
> >>users convenient access to a larger set of language extensions which
> >>have been long considered stable.
> >>
> >>  * Merging of `ghc-exactprint` into the GHC tree, providing
> >>infrastructure for source-to-source program rewriting out-of-the-box.
> >>
> >>  * Introduction of a `BoxedRep` `RuntimeRep`, allowing for polymorphism
> >>over levity of boxed objects (#17526)
> >>
> >>  * Implementation of the `UnliftedDataTypes` extension, allowing users
> >>to define types which do not admit lazy evaluation ([proposal])
> >>
> >>  * The new [`-hi` profiling] mechanism which provides significantly
> >>improved insight into thunk leaks.
> >>
> >>  * Support for the `ghc-debug` out-of-process heap inspection library
> >>[ghc-debug]
> >>
> >>  * Significant improvements in the bytecode interpreter, allowing more
> >>programs to be efficently run in GHCi and Template Haskell splices.
> >>
> >>  * Support for profiling of pinned objects with the cost-centre profiler
> >>(#7275)
> >>
> >>  * Faster compilation and a smaller memory footprint
> >>
> >>  * Introduction of Haddock documentation support in TemplateHaskell
> (#5467)
> >>
> >> Finally, thank you to Microsoft Research, GitHub, IOHK, the Zw3rk stake
> >> pool, Tweag I/O, Serokell, Equinix, SimSpace, and other anonymous
> >> contributors whose on-going financial and in-kind support has
> >> facilitated GHC maintenance and release management over the years.
> >> Moreover, this

Re: regression in ghc / cabal integration in 9.2.1

2021-10-30 Thread Mikolaj Konarski

Hi George,

Since many versions of cabal, `install` only installs executables, not
libraries, so if that worked for you, you must have had an old version
of cabal.

Please see https://github.com/haskell/cabal/issues/6481 for some
context and to help you find a new workflow that works for you
(ideally, a standard one).

Kind regards,
Mikolaj

On Sat, Oct 30, 2021 at 5:40 PM George Colpitts
 wrote:
>
> Thanks Ben!
>
> There seems to be a regression in ghc / cabal integration in 9.2.1.
>
> In 9.2.1 if I do
>
> cabal install vector
>
> Compilation of a file containing
>
>
> import Data.Vector
>
>
> main = undefined
>
>
> fails with
>
>  Could not find module ‘Data.Vector’
> Perhaps you meant Data.Functor (from base-4.16.0.0)
> Use -v (or `:set -v` in ghci) to see a list of the files searched for.
>   |
> 2 | import Data.Vector
>   | ^^
>
> The preceding works on ghc 9.0.1
>
> Should I file a bug against Cabal?
>
> Thanks
> George
>
> On Fri, Oct 29, 2021 at 12:54 PM Ben Gamari  wrote:
>>
>> Hi all,
>>
>> The GHC developers are very happy to at long last announce the
>> availability of GHC 9.2.1. Binary distributions, source distributions,
>> and documentation are available at
>>
>> https://downloads.haskell.org/ghc/9.2.1
>>
>> GHC 9.2 brings a number of exciting features including:
>>
>>  * A native code generation backend for AArch64, significantly speeding
>>compilation time on ARM platforms like the Apple M1.
>>
>>  * Many changes in the area of records, including the new
>>`RecordDotSyntax` and `NoFieldSelectors` language extensions, as well
>>as Support for `DuplicateRecordFields` with `PatternSynonyms`.
>>
>>  * Introduction of the new `GHC2021` language extension set, giving
>>users convenient access to a larger set of language extensions which
>>have been long considered stable.
>>
>>  * Merging of `ghc-exactprint` into the GHC tree, providing
>>infrastructure for source-to-source program rewriting out-of-the-box.
>>
>>  * Introduction of a `BoxedRep` `RuntimeRep`, allowing for polymorphism
>>over levity of boxed objects (#17526)
>>
>>  * Implementation of the `UnliftedDataTypes` extension, allowing users
>>to define types which do not admit lazy evaluation ([proposal])
>>
>>  * The new [`-hi` profiling] mechanism which provides significantly
>>improved insight into thunk leaks.
>>
>>  * Support for the `ghc-debug` out-of-process heap inspection library
>>[ghc-debug]
>>
>>  * Significant improvements in the bytecode interpreter, allowing more
>>programs to be efficently run in GHCi and Template Haskell splices.
>>
>>  * Support for profiling of pinned objects with the cost-centre profiler
>>(#7275)
>>
>>  * Faster compilation and a smaller memory footprint
>>
>>  * Introduction of Haddock documentation support in TemplateHaskell (#5467)
>>
>> Finally, thank you to Microsoft Research, GitHub, IOHK, the Zw3rk stake
>> pool, Tweag I/O, Serokell, Equinix, SimSpace, and other anonymous
>> contributors whose on-going financial and in-kind support has
>> facilitated GHC maintenance and release management over the years.
>> Moreover, this release would not have been possible without the hundreds
>> of open-source contributors whose work comprise this release.
>>
>> As always, do open a [ticket] if you see anything amiss.
>>
>> Happy testing,
>>
>> - Ben
>>
>>
>> [apple-m1]: https://www.haskell.org/ghc/blog/20210309-apple-m1-story.html
>> [proposal]: 
>> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0265-unlifted-datatypes.rst
>> [-hi profiling]: 
>> https://well-typed.com/blog/2021/01/first-look-at-hi-profiling-mode/
>> [ghc-debug]: http://ghc.gitlab.haskell.org/ghc-debug/
>> [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
>> ___
>> ghc-devs mailing list
>> ghc-d...@haskell.org
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
>
> ___
> ghc-devs mailing list
> ghc-d...@haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
___
Glasgow-haskell-users mailing list
Glasgow-haskell-users@haskell.org
http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users

regression in ghc / cabal integration in 9.2.1

2021-10-30 Thread George Colpitts

Thanks Ben!

There seems to be a regression in ghc / cabal integration in 9.2.1.

In 9.2.1 if I do

cabal install vector

Compilation of a file containing


import Data.Vector


main = undefined


fails with

 Could not find module ‘Data.Vector’
Perhaps you meant Data.Functor (from base-4.16.0.0)
Use -v (or `:set -v` in ghci) to see a list of the files searched for.
  |
2 | import Data.Vector
  | ^^

The preceding works on ghc 9.0.1

Should I file a bug against Cabal?

Thanks
George

On Fri, Oct 29, 2021 at 12:54 PM Ben Gamari  wrote:

> Hi all,
>
> The GHC developers are very happy to at long last announce the
> availability of GHC 9.2.1. Binary distributions, source distributions,
> and documentation are available at
>
> https://downloads.haskell.org/ghc/9.2.1
>
> GHC 9.2 brings a number of exciting features including:
>
>  * A native code generation backend for AArch64, significantly speeding
>compilation time on ARM platforms like the Apple M1.
>
>  * Many changes in the area of records, including the new
>`RecordDotSyntax` and `NoFieldSelectors` language extensions, as well
>as Support for `DuplicateRecordFields` with `PatternSynonyms`.
>
>  * Introduction of the new `GHC2021` language extension set, giving
>users convenient access to a larger set of language extensions which
>have been long considered stable.
>
>  * Merging of `ghc-exactprint` into the GHC tree, providing
>infrastructure for source-to-source program rewriting out-of-the-box.
>
>  * Introduction of a `BoxedRep` `RuntimeRep`, allowing for polymorphism
>over levity of boxed objects (#17526)
>
>  * Implementation of the `UnliftedDataTypes` extension, allowing users
>to define types which do not admit lazy evaluation ([proposal])
>
>  * The new [`-hi` profiling] mechanism which provides significantly
>improved insight into thunk leaks.
>
>  * Support for the `ghc-debug` out-of-process heap inspection library
>[ghc-debug]
>
>  * Significant improvements in the bytecode interpreter, allowing more
>programs to be efficently run in GHCi and Template Haskell splices.
>
>  * Support for profiling of pinned objects with the cost-centre profiler
>(#7275)
>
>  * Faster compilation and a smaller memory footprint
>
>  * Introduction of Haddock documentation support in TemplateHaskell (#5467)
>
> Finally, thank you to Microsoft Research, GitHub, IOHK, the Zw3rk stake
> pool, Tweag I/O, Serokell, Equinix, SimSpace, and other anonymous
> contributors whose on-going financial and in-kind support has
> facilitated GHC maintenance and release management over the years.
> Moreover, this release would not have been possible without the hundreds
> of open-source contributors whose work comprise this release.
>
> As always, do open a [ticket] if you see anything amiss.
>
> Happy testing,
>
> - Ben
>
>
> [apple-m1]: https://www.haskell.org/ghc/blog/20210309-apple-m1-story.html
> [proposal]:
> https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0265-unlifted-datatypes.rst
> [-hi
> 
> profiling]:
> https://well-typed.com/blog/2021/01/first-look-at-hi-profiling-mode/
> [ghc-debug
> ]:
> http://ghc.gitlab.haskell.org/ghc-debug/
> [ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
> ___
> ghc-devs mailing list
> ghc-d...@haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
>
___
Glasgow-haskell-users mailing list
Glasgow-haskell-users@haskell.org
http://mail.haskell.org/cgi-bin/mailman/listinfo/glasgow-haskell-users

Re: regression in ghc / cabal integration in 9.2.1

Re: regression in ghc / cabal integration in 9.2.1

Re: regression in ghc / cabal integration in 9.2.1

Re: regression in ghc / cabal integration in 9.2.1

Re: regression in ghc / cabal integration in 9.2.1

regression in ghc / cabal integration in 9.2.1

6 matches

Site Navigation

Mail list logo

Footer information