First attempt at fixing incompabilities with newer cabal

1 files changed, 11 insertions, 0 deletions

diff --git a/src/compiler/GF/Infra/UseIO.hs b/src/compiler/GF/Infra/UseIO.hs
index e27b6e075..4c5a26d32 100644
--- a/src/compiler/GF/Infra/UseIO.hs
+++ b/src/compiler/GF/Infra/UseIO.hs
@@ -159,6 +159,9 @@ instance ErrorMonad IO where
                                 then h (ioeGetErrorString e)
                                 else ioError e
 {-
+-- Control.Monad.Fail import will become redundant in GHC 8.8+
+import qualified Control.Monad.Fail as Fail
+
 instance Functor IOE where fmap = liftM
 
 instance Applicative IOE where
@@ -170,7 +173,15 @@ instance  Monad IOE where
   IOE c >>= f = IOE $ do 
                   x <- c          -- Err a
                   appIOE $ err raise f x         -- f :: a -> IOE a
+
+ #if !(MIN_VERSION_base(4,13,0))
+  fail = raise
+ #endif
+
+instance Fail.MonadFail IOE where
   fail = raise
+
+
 -}
 
 -- | Print the error message and return a default value if the IO operation 'fail's