move instance Binary NAtom to the parent

Author: Anton-Latukha

src/Nix/Atoms.hs

@@ -11,12 +11,13 @@ import Codec.Serialise
 #endif
 import           Control.DeepSeq
 import           Data.Data
-import           Data.Fixed                     (mod')
+import           Data.Fixed                     ( mod' )
 import           Data.Hashable
 import           Data.Text                      ( Text
                                                 , pack
                                                 )
 import           GHC.Generics
+import           Data.Binary                    ( Binary )
 
 -- | Atoms are values that evaluate to themselves. This means that
 -- they appear in both the parsed AST (in the form of literals) and
@@ -40,6 +41,8 @@ data NAtom
 instance Serialise NAtom
 #endif
 
+instance Binary NAtom
+
 -- | Translate an atom into its nix representation.
 atomText :: NAtom -> Text
 atomText (NURI   t) = t

src/Nix/Expr/Types.hs

@@ -530,7 +530,6 @@ instance Binary Pos where
 instance Binary SourcePos
 instance Binary a => Binary (NKeyName a)
 instance Binary a => Binary (Params a)
-instance Binary NAtom
 instance Binary NUnaryOp
 instance Binary NBinaryOp
 instance Binary NRecordType