Indexed newtypes

[ghc-hetmet.git] / compiler / basicTypes / DataCon.lhs

diff --git a/compiler/basicTypes/DataCon.lhs b/compiler/basicTypes/DataCon.lhs
index aa87958..3de9905 100644 (file)
--- a/compiler/basicTypes/DataCon.lhs
+++ b/compiler/basicTypes/DataCon.lhs
@@ -38,7 +38,8 @@ import Type           ( Type, ThetaType,
 import Coercion                ( isEqPred, mkEqPred )
 import TyCon           ( TyCon, FieldLabel, tyConDataCons, 
                          isProductTyCon, isTupleTyCon, isUnboxedTupleTyCon,
-                          isNewTyCon, isRecursiveTyCon, tyConFamInst_maybe )
+                          isNewTyCon, isClosedNewTyCon, isRecursiveTyCon,
+                          tyConFamInst_maybe )
 import Class           ( Class, classTyCon )
 import Name            ( Name, NamedThing(..), nameUnique, mkSysTvName, mkSystemName )
 import Var             ( TyVar, CoVar, Id, mkTyVar, tyVarKind, setVarUnique,
@@ -727,9 +728,10 @@ splitProductType str ty
 deepSplitProductType_maybe ty
   = do { (res@(tycon, tycon_args, _, _)) <- splitProductType_maybe ty
        ; let {result 
-             | isNewTyCon tycon && not (isRecursiveTyCon tycon)
+             | isClosedNewTyCon tycon && not (isRecursiveTyCon tycon)
              = deepSplitProductType_maybe (newTyConInstRhs tycon tycon_args)
-             | isNewTyCon tycon = Nothing  -- cannot unbox through recursive newtypes
+             | isNewTyCon tycon = Nothing  -- cannot unbox through recursive
+                                          -- newtypes nor through families
              | otherwise = Just res}
        ; result
        }