When trying to compile with the head of GHC 8.0.1 (GHC-8.0 branch, version 8.0.1.20160919), I get a series of errors like this:
Control\Monad\Logger.hs:249:10: error:
* Couldn't match type 'm' with 'IdentityT m'
'm' is a rigid type variable bound by
the instance declaration at Control\Monad\Logger.hs:249:10
Expected type: IdentityT
m (Loc -> LogSource -> LogLevel -> LogStr -> IO ())
Actual type: IdentityT
(IdentityT m) (Loc -> LogSource -> LogLevel -> LogStr -> IO ())
* In the expression:
Control.Monad.Logger.$dmaskLoggerIO @IdentityT m
In an equation for 'askLoggerIO':
askLoggerIO = Control.Monad.Logger.$dmaskLoggerIO @IdentityT m
In the instance declaration for 'MonadLoggerIO (IdentityT m)'
* Relevant bindings include
askLoggerIO :: IdentityT
m (Loc -> LogSource -> LogLevel -> LogStr -> IO ())
(bound at Control\Monad\Logger.hs:249:10)
Hi,
When trying to compile with the head of GHC 8.0.1 (GHC-8.0 branch, version 8.0.1.20160919), I get a series of errors like this:
I am guessing this is related to the following patch in GHC: http://git.haskell.org/ghc.git/commit/54b887b5abf6ee723c6ac6aaa2d2f4c14cf74060 (We were able to compile with GHC 8.0.1.20160901)
Full log is attached
I don't know that this is something which needs by GHC or here, but I wanted to record it for now.
Thanks,
EDIT: Further reading: https://ghc.haskell.org/trac/ghc/ticket/12220 https://ghc.haskell.org/trac/ghc/ticket/12466
It looks like this isn't going to make it into 8.0.2, so I guess this is all irrelevant