Revert "Define unName as a function rather than a field selector."

This reverts commit cc049408acc40a560ad85a5d53c776437c99565a.

src/Data/Abstract/Environment.hs

@@ -88,7 +88,7 @@ mergeNewer (Environment a) (Environment b) =
 -- | Extract an association list of bindings from an 'Environment'.
 --
 -- >>> pairs shadowed
--- [(Name "foo",Address (Precise 1))]
+-- [(Name {unName = "foo"},Address (Precise 1))]
 pairs :: Environment location value -> [(Name, Address location value)]
 pairs = map (second Address) . Map.toList . fold . unEnvironment
 

src/Data/Abstract/FreeVariables.hs

@@ -8,15 +8,12 @@ import           Data.Term
 import           Prologue
 
 -- | The type of variable names.
-newtype Name = Name ByteString
+newtype Name = Name { unName :: ByteString }
   deriving (Eq, Ord, Show)
 
 name :: ByteString -> Name
 name = Name
 
-unName :: Name -> ByteString
-unName (Name bytes) = bytes
-
 instance IsString Name where
   fromString = Name . BC.pack