Remove the distinction between data and newtype families

[ghc-hetmet.git] / compiler / types / TyCon.lhs

diff --git a/compiler/types/TyCon.lhs b/compiler/types/TyCon.lhs
index 50d76cf..85881b6 100644 (file)
--- a/compiler/types/TyCon.lhs
+++ b/compiler/types/TyCon.lhs
@@ -213,16 +213,13 @@ data AlgTyConRhs
 
   | OpenTyCon {
 
-      otArgPoss   :: Maybe [Int],  
+      otArgPoss   :: Maybe [Int]
        -- Nothing <=> top-level indexed type family
        -- Just ns <=> associated (not toplevel) family
        --   In the latter case, for each tyvar in the AT decl, 'ns' gives the
        --   position of that tyvar in the class argument list (starting from 0).
        --   NB: Length is less than tyConArity iff higher kind signature.
        
-      otIsNewtype :: Bool           
-        -- is a newtype (rather than data type)?
-
     }
 
   | DataTyCon {
@@ -616,9 +613,14 @@ isDataTyCon :: TyCon -> Bool
 --     True for all @data@ types
 --     False for newtypes
 --               unboxed tuples
+--               type families
+-- 
+-- NB: for a data type family, T, only the *instance* tycons are
+--     get an info table etc.  The family tycon does not.
+--     Hence False for OpenTyCon
 isDataTyCon tc@(AlgTyCon {algTcRhs = rhs})  
   = case rhs of
-        OpenTyCon {}  -> not (otIsNewtype rhs)
+        OpenTyCon {}  -> False
        DataTyCon {}  -> True
        NewTyCon {}   -> False
        AbstractTyCon -> False   -- We don't know, so return False
@@ -628,7 +630,6 @@ isDataTyCon other = False
 isNewTyCon :: TyCon -> Bool
 isNewTyCon (AlgTyCon {algTcRhs = rhs}) = 
   case rhs of
-    OpenTyCon {} -> otIsNewtype rhs
     NewTyCon {}  -> True
     _           -> False
 isNewTyCon other                      = False