regression in ghc / cabal integration in 9.2.1

[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
<george.colpitts at gmail.com> 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 <ben at well-typed.com> 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
>> _______________________________________________
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>
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