Re: heads-up: Haskell updates

[Mark H Weaver]

Hi Ricardo,

Ricardo Wurmus <address@hidden> writes:
> I’ve just pushed a very large number of updates to Haskell packages and
> switched to GHC 8 as the default.

Wow, it's an impressive amount of work, kudos to you!

So far, almost all of the new packages are building successfully on
Hydra, but I see one failure: ghc-resourcet, which in turn causes
r-bookdown to dep-fail:

  https://hydra.gnu.org/build/2495799/nixlog/1/raw

There are many errors similar to these:

--8<---------------cut here---------------start------------->8---
Control/Monad/Trans/Resource/Internal.hs:302:10: error:
    • Could not deduce (MonadBase IO (Strict.StateT s m))
        arising from the superclasses of an instance declaration
      from the context: MonadResource m
        bound by the instance declaration
        at Control/Monad/Trans/Resource/Internal.hs:302:10-63
    • In the instance declaration for
        ‘MonadResource (Strict.StateT s m)’

Control/Monad/Trans/Resource/Internal.hs:303:10: error:
    • Could not deduce (MonadBase IO (Strict.WriterT w m))
        arising from the superclasses of an instance declaration
      from the context: (Monoid w, MonadResource m)
        bound by the instance declaration
        at Control/Monad/Trans/Resource/Internal.hs:303:10-75
    • In the instance declaration for
        ‘MonadResource (Strict.WriterT w m)’
phase `build' failed after 1.5 seconds
builder for 
`/gnu/store/r9mlrjkywz6grnmf84gwmy3ggx1zglkd-ghc-resourcet-1.1.7.5.drv' failed 
with exit code 1
@ build-failed 
/gnu/store/r9mlrjkywz6grnmf84gwmy3ggx1zglkd-ghc-resourcet-1.1.7.5.drv - 1 
builder for 
`/gnu/store/r9mlrjkywz6grnmf84gwmy3ggx1zglkd-ghc-resourcet-1.1.7.5.drv' failed 
with exit code 1
--8<---------------cut here---------------end--------------->8---

Thanks for working on it!

      Mark