Update to data-fix-0.3

Changelog: http://hackage.haskell.org/package/data-fix-0.3.0/changelog

Context: commercialhaskell/stackage#5535

default.nix

@@ -212,6 +212,20 @@ let
       # require n-i >= 0.4. dontCheck helps us avoid conflicts with
       # neat-interpolation's test dependencies.
       neat-interpolation = pkgs.haskell.lib.dontCheck super.neat-interpolation_0_5_1;
+
+      # 2020-07-23 hnix uses multiple functions that are unavailable in
+      # data-fix < 0.3.
+      data-fix = haskellPackages.callPackage
+       ({ mkDerivation, base, deepseq, hashable, stdenv }:
+        mkDerivation {
+          pname = "data-fix";
+          version = "0.3.0";
+          sha256 = "9e59b3ed694b5139316093b3767842e60ad4821858459e7cd763e5773dfa99a0";
+          libraryHaskellDepends = [ base deepseq hashable ];
+          homepage = "https://github.com/spell-music/data-fix";
+          description = "Fixpoint data types";
+          license = stdenv.lib.licenses.bsd3;
+        }) {};
     };
 
     modifier = drv: pkgs.haskell.lib.overrideCabal drv (attrs: {

hnix.cabal

@@ -873,7 +873,7 @@ library
     , bytestring >= 0.10.8 && < 0.11
     , comonad >= 5.0.4 && < 5.1
     , containers >= 0.5.11.0 && < 0.7
-    , data-fix >= 0.2.0 && < 0.3
+    , data-fix >= 0.3.0 && < 0.4
     , deepseq >= 1.4.3 && <1.5
     , deriving-compat >= 0.3 && < 0.6
     , directory >= 1.3.1 && < 1.4

src/Nix/Builtins.hs

@@ -43,7 +43,7 @@ import           Data.ByteString                ( ByteString )
 import qualified Data.ByteString               as B
 import           Data.ByteString.Base16        as Base16
 import           Data.Char                      ( isDigit )
-import           Data.Fix                       ( cata )
+import           Data.Fix                       ( foldFix )
 import           Data.Foldable                  ( foldrM )
 import qualified Data.HashMap.Lazy             as M
 import           Data.List
@@ -196,7 +196,7 @@ builtinsList = sequence
           outputsList = map outputToAttrListElement outputs;
 
         in (builtins.head outputsList).value|]
-      [| cata Eval.eval expr |]
+      [| foldFix Eval.eval expr |]
     )
 
   , add  TopLevel "derivationStrict" derivationStrict_

src/Nix/Expr/Types/Annotated.hs

@@ -35,7 +35,7 @@ import           Data.Aeson.TH
 import           Data.Binary                    ( Binary(..) )
 import           Data.Data
 import           Data.Eq.Deriving
-import           Data.Fix
+import           Data.Fix                       ( Fix(..), unfoldFix )
 import           Data.Function                  ( on )
 import           Data.Functor.Compose
 import           Data.Hashable
@@ -108,14 +108,10 @@ type NExprLocF = AnnF SrcSpan NExprF
 -- | A nix expression with source location at each subexpression.
 type NExprLoc = Fix NExprLocF
 
-instance NFData NExprLoc
-
 #ifdef MIN_VERSION_serialise
 instance Serialise NExprLoc
 #endif
 
-instance Hashable NExprLoc
-
 instance Binary SrcSpan
 instance (Binary ann, Binary a) => Binary (Ann ann a)
 instance Binary r => Binary (NExprLocF r)
@@ -135,7 +131,7 @@ pattern AnnE :: forall ann (g :: * -> *). ann
 pattern AnnE ann a = Fix (Compose (Ann ann a))
 
 stripAnnotation :: Functor f => Fix (AnnF ann f) -> Fix f
-stripAnnotation = ana (annotated . getCompose . unFix)
+stripAnnotation = unfoldFix (annotated . getCompose . unFix)
 
 stripAnn :: AnnF ann f r -> f r
 stripAnn = annotated . getCompose

src/Nix/Pretty.hs

@@ -18,7 +18,7 @@ module Nix.Pretty where
 import           Control.Applicative            ( (<|>) )
 import           Control.Comonad
 import           Control.Monad.Free
-import           Data.Fix
+import           Data.Fix                       ( Fix(..), foldFix )
 import           Data.HashMap.Lazy              ( toList )
 import qualified Data.HashMap.Lazy             as M
 import qualified Data.HashSet                  as HashSet
@@ -190,7 +190,7 @@ prettyAtom :: NAtom -> NixDoc ann
 prettyAtom atom = simpleExpr $ pretty $ unpack $ atomText atom
 
 prettyNix :: NExpr -> Doc ann
-prettyNix = withoutParens . cata exprFNixDoc
+prettyNix = withoutParens . foldFix exprFNixDoc
 
 instance HasCitations1 m v f
   => HasCitations m v (NValue' t f m a) where

src/Nix/Reduce.hs

@@ -43,7 +43,7 @@ import           Control.Monad.Fix
 import           Control.Monad.IO.Class
 import           Control.Monad.Reader
 import           Control.Monad.State.Strict
-import           Data.Fix
+import           Data.Fix                       ( Fix(..), foldFix, foldFixM )
 -- import           Data.Foldable
 import           Data.HashMap.Lazy              ( HashMap )
 import qualified Data.HashMap.Lazy             as M
@@ -117,12 +117,12 @@ staticImport pann path = do
           x' = Fix (NLet_ span [cur] x)
         modify (M.insert path x')
         local (const (Just path, emptyScopes @m @NExprLoc)) $ do
-          x'' <- cata reduce x'
+          x'' <- foldFix reduce x'
           modify (M.insert path x'')
           return x''
 
 -- gatherNames :: NExprLoc -> HashSet VarName
--- gatherNames = cata $ \case
+-- gatherNames = foldFix $ \case
 --     NSym_ _ var -> S.singleton var
 --     Compose (Ann _ x) -> fold x
 
@@ -132,7 +132,7 @@ reduceExpr mpath expr =
   (`evalStateT` M.empty)
     . (`runReaderT` (mpath, emptyScopes))
     . runReducer
-    $ cata reduce expr
+    $ foldFix reduce expr
 
 reduce
   :: forall m
@@ -173,7 +173,7 @@ reduce (NBinary_ bann NApp fun arg) = fun >>= \case
 
   Fix (NAbs_ _ (Param name) body) -> do
     x <- arg
-    pushScope (M.singleton name x) (cata reduce body)
+    pushScope (M.singleton name x) (foldFix reduce body)
 
   f -> Fix . NBinary_ bann NApp f <$> arg
 
@@ -299,15 +299,15 @@ instance Show (f r) => Show (FlaggedF f r) where
 type Flagged f = Fix (FlaggedF f)
 
 flagExprLoc :: (MonadIO n, Traversable f) => Fix f -> n (Flagged f)
-flagExprLoc = cataM $ \x -> do
+flagExprLoc = foldFixM $ \x -> do
   flag <- liftIO $ newIORef False
   pure $ Fix $ FlaggedF (flag, x)
 
 -- stripFlags :: Functor f => Flagged f -> Fix f
--- stripFlags = cata $ Fix . snd . flagged
+-- stripFlags = foldFix $ Fix . snd . flagged
 
 pruneTree :: MonadIO n => Options -> Flagged NExprLocF -> n (Maybe NExprLoc)
-pruneTree opts = cataM $ \(FlaggedF (b, Compose x)) -> do
+pruneTree opts = foldFixM $ \(FlaggedF (b, Compose x)) -> do
   used <- liftIO $ readIORef b
   pure $ if used then Fix . Compose <$> traverse prune x else Nothing
  where
@@ -414,7 +414,7 @@ reducingEvalExpr
   -> m (NExprLoc, Either r a)
 reducingEvalExpr eval mpath expr = do
   expr'           <- flagExprLoc =<< liftIO (reduceExpr mpath expr)
-  eres <- catch (Right <$> cata (addEvalFlags eval) expr') (pure . Left)
+  eres <- catch (Right <$> foldFix (addEvalFlags eval) expr') (pure . Left)
   opts :: Options <- asks (view hasLens)
   expr''          <- pruneTree opts expr'
   return (fromMaybe nNull expr'', eres)

src/Nix/Type/Infer.hs

@@ -39,7 +39,7 @@ import           Control.Monad.Reader
 import           Control.Monad.Ref
 import           Control.Monad.ST
 import           Control.Monad.State.Strict
-import           Data.Fix                       ( cata )
+import           Data.Fix                       ( foldFix )
 import           Data.Foldable
 import qualified Data.HashMap.Lazy             as M
 import           Data.List                      ( delete
@@ -564,7 +564,7 @@ instance MonadInfer m => ToValue Bool (InferT s m) (Judgment s) where
   toValue _ = pure $ Judgment As.empty [] typeBool
 
 infer :: MonadInfer m => NExpr -> InferT s m (Judgment s)
-infer = cata Eval.eval
+infer = foldFix Eval.eval
 
 inferTop :: Env -> [(Text, NExpr)] -> Either InferError Env
 inferTop env []                = Right env

tests/PrettyParseTests.hs

@@ -143,7 +143,7 @@ equivUpToNormalization :: NExpr -> NExpr -> Bool
 equivUpToNormalization x y = normalize x == normalize y
 
 normalize :: NExpr -> NExpr
-normalize = cata $ \case
+normalize = foldFix $ \case
   NConstant (NInt n) | n < 0 ->
     Fix (NUnary NNeg (Fix (NConstant (NInt (negate n)))))
   NConstant (NFloat n) | n < 0 ->