Haskell package versions (was bug#44174: [PATCH v2 00/15] Add hledger and its dependencies.)

[Christopher Baines <mail@cbaines.net>]

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Ricardo Wurmus <rekado@elephly.net> writes:

> Christopher Baines <mail@cbaines.net> writes:
>
>>> Carlo Holl (15):
>>>   gnu: Add ghc-control-monad-free.
>>>   gnu: Add ghc-csv.
>>>   gnu: Add ghc-decimal.
>>>   gnu: ghc-doctest: Update to 0.16.3.
>>>   gnu: Add ghc-hspec-megaparsec.
>>>   gnu: Add ghc-lucid.
>>>   gnu: Add ghc-only.
>>>   gnu: Add ghc-text-short.
>>>   gnu: Add ghc-tabular.
>>>   gnu: Add ghc-uglymemo.
>>>   gnu: Add ghc-wizards.
>>>   gnu: Add ghc-cassava.
>>>   gnu: Add ghc-cassava-megaparsec.
>>>   gnu: Add ghc-hledger-lib.
>>>   gnu: Add hledger.
>>>
>>>  gnu/packages/finance.scm     |  63 ++++
>>>  gnu/packages/haskell-xyz.scm | 557 ++++++++++++++++++++++++++++++++++-
>>>  2 files changed, 608 insertions(+), 12 deletions(-)
>>
>> Awesome! I went through and tweaked some descriptions and wrapping and
>> pushed to master as e6bfb02eb79777b760031384d4a3c14239f7fb55.
>
> Unfortunately, some of these packages are the latest versions on
> Hackage, but we need to ensure that all Haskell packages are picked at
> versions corresponding to the currently supported version of LTSHaskell
> in Guix.  We are behind the current LTSHaskell with our packages, so now
> we have the situation where we have packages that are *newer* than the
> latest LTSHaskell release and packages that are *older* than what the
> latest LTSHaskell release prescribes.
>
> We should fix this soon, because mixing Haskell packages from different
> LTS releases (or even ignoring the LTS releases in favour of the latest
> versions on Hackage) results in dependency hell for those users who want
> to use Guix for Haskell development.

I'm not really aware of any Haskell specific packaging practices, and
while I can't guarantee I'd have read it, if there is a reason to not
use the latest version of Haskell packages, it would be good to have
that reason set out in the docs [1].

1: https://guix.gnu.org/manual/en/html_node/Packaging-Guidelines.html#Packaging-Guidelines

I didn't look too carefully at the versions here, apart from the
ghc-doctest package, where I concluded that any related packages that
failed to build were already broken.

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