Hi Ricardo,

Ricardo Wurmus <rekado@elephly.net> writes:

[...]

>> % ./pre-inst-env guix build -K --check git-annex
>> Utility/Exception.hs:29:1: error:
>>     Bad interface file: /gnu/store/qb3knv1h536sdjqc4nfkm3j1l8n7q87a-ghc-exceptions-0.10.0/lib/ghc-8.4.3/exceptions-0.10.0/Control/Monad/Catch.dyn_hi
>>         Something is amiss; requested module  exceptions-0.10.0:Control.Monad.Catch differs from name found in the interface file exceptions-0.10.0:Control.Monad.Catch (if these names look the same, try again with -dppr-debug)
>>    |
>> 29 | import Control.Monad.Catch as X hiding (Handler)
>>    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> It seems to me that this is a more general problem affecting all of our
> Haskell packages.  The configure phase that you didn’t paste should show
> that modules are provided by slightly different packages.

Sorry for snipping relevant output (I meant to at least indicate that I
had snipped :/ ).  I've attached the full output now.  (FWIW it looks
like that failure happens in the pre-configure stage, so it doesn't get
to the configure phase.)

> The haskell-build-system suffers from non-determinism.  It might just be
> limited to the package database files that are generated by ghc-pkg
> (where readdir is used and the result isn’t sorted).
>
> I’m opening a bug report for this issue.

OK, thank you.