load Control.Monad.Fail if GHC < 8.8

haskell-nix · Jan 8, 2021 · a474d77 · a474d77
1 parent 4aa5dcd
commit a474d77
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diff --git a/src/Nix/Fresh/Stable.hs b/src/Nix/Fresh/Stable.hs
@@ -14,7 +14,10 @@ import Nix.Effects
 import Nix.Render
 import Nix.Thunk
 import Nix.Thunk.StableId
+#if __GLASGOW_HASKELL__ < 880
+import Prelude hiding (fail)
 import Control.Monad.Fail
+#endif
 import Control.Monad.Reader
 import Control.Monad.State.Strict
 import Control.Monad.Ref

diff --git a/src/Nix/Scope/Basic.hs b/src/Nix/Scope/Basic.hs
@@ -19,7 +19,10 @@ module Nix.Scope.Basic where
 
 import Control.Applicative
 import Control.Monad.Exception
+#if __GLASGOW_HASKELL__ < 880
+import Prelude hiding (fail)
 import Control.Monad.Fail
+#endif
 import Control.Monad.Reader
 import Control.Monad.State
 import Control.Monad.Catch

diff --git a/src/Nix/Thunk/Basic.hs b/src/Nix/Thunk/Basic.hs
@@ -18,7 +18,10 @@ module Nix.Thunk.Basic (ThunkT (..), runThunkT, NThunkF (..), Deferred (..)) whe
 
 import           Control.Exception       hiding ( catch )
 import           Control.Monad.Catch
+#if __GLASGOW_HASKELL__ < 880
+import           Prelude hiding (fail)
 import           Control.Monad.Fail
+#endif
 import           Control.Monad.Reader
 import           Control.Monad.State