Add tentative support for upcoming&unreleased base-4.13.0.0

NB: `Stream` is an internal monad and so we don't need to bother with
the `fail` compat package.

Codec/Compression/Zlib/Stream.hsc

@@ -123,6 +123,9 @@ import Data.ByteString (ByteString)
 import Control.Applicative (Applicative(..))
 #endif
 import Control.Monad (ap,liftM)
+#if MIN_VERSION_base(4,9,0)
+import qualified Control.Monad.Fail as Fail
+#endif
 #if __GLASGOW_HASKELL__ >= 702
 #if __GLASGOW_HASKELL__ >= 708
 import Control.Monad.ST.Strict
@@ -373,8 +376,21 @@ instance Monad Stream where
   (>>=)  = thenZ
 --  m >>= f = (m `thenZ` \a -> consistencyCheck `thenZ_` returnZ a) `thenZ` f
   (>>)   = (*>)
+
+#if !MIN_VERSION_base(4,8,0)
   return = pure
+#endif
+
+#if !MIN_VERSION_base(4,9,0)
   fail   = (finalise >>) . failZ
+#elif !MIN_VERSION_base(4,13,0)
+  fail   = Fail.fail
+#endif
+
+#if MIN_VERSION_base(4,9,0)
+instance Fail.MonadFail Stream where
+  fail   = (finalise >>) . failZ
+#endif
 
 returnZ :: a -> Stream a
 returnZ a = Z $ \_ inBuf outBuf outOffset outLength ->

changelog

@@ -1,3 +1,7 @@
+0.6.2.1 TBD
+
+* Add support for GHC 8.8 / base-4.13
+
 0.6.2 Herbert Valerio Riedel <hvr@gnu.org> March 2018
 
  * New cabal flag 'pkg-config' for discovering 'zlib` via pkg-config(1) (#16)

zlib.cabal

@@ -1,5 +1,5 @@
 name:            zlib
-version:         0.6.2
+version:         0.6.2.1
 copyright:       (c) 2006-2016 Duncan Coutts
 license:         BSD3
 license-file:    LICENSE