Fixed two data family bugs

Mon Sep 18 19:06:51 EDT 2006  Manuel M T Chakravarty <chak@cse.unsw.edu.au>
  * Fixed two data family bugs
  Mon Aug 21 15:16:16 EDT 2006  Manuel M T Chakravarty <chak@cse.unsw.edu.au>
    * Fixed two data family bugs
    - Too liberal pattern matching in `tcTyClDecl1'
    - Open TyCons must always be exposed (ie, never be turned into abstract tycons
      during tidying)

compiler/main/TidyPgm.lhs

@@ -39,7 +39,8 @@ import Type		( tidyTopType )
 import TcType		( isFFITy )
 import DataCon		( dataConName, dataConFieldLabels, dataConWrapId_maybe )
 import TyCon		( TyCon, makeTyConAbstract, tyConDataCons, isNewTyCon, 
-			  newTyConRep, tyConSelIds, isAlgTyCon, isEnumerationTyCon )
+			  newTyConRep, tyConSelIds, isAlgTyCon,
+			  isEnumerationTyCon, isOpenTyCon )
 import Class		( classSelIds )
 import Module		( Module )
 import HscTypes		( HscEnv(..), NameCache( nsUniqs ), CgGuts(..),
@@ -351,6 +352,8 @@ mustExposeTyCon exports tc
   | isEnumerationTyCon tc	-- For an enumeration, exposing the constructors
   = True			-- won't lead to the need for further exposure
 				-- (This includes data types with no constructors.)
+  | isOpenTyCon tc		-- open type family
+  = True
   | otherwise			-- Newtype, datatype
   = any exported_con (tyConDataCons tc)
 	-- Expose rep if any datacon or field is exported

compiler/typecheck/TcTyClsDecls.lhs

@@ -615,7 +615,8 @@ tcTyClDecl calc_isrec decl
 tcTyClDecl1 _calc_isrec 
   (TyFunction {tcdLName = L _ tc_name, tcdTyVars = tvs, tcdKind = kind})
   = tcTyVarBndrs tvs  $ \ tvs' -> do 
-  { gla_exts <- doptM Opt_GlasgowExts
+  { traceTc (text "type family: " <+> ppr tc_name) 
+  ; gla_exts <- doptM Opt_GlasgowExts
 
 	-- Check that we don't use kind signatures without Glasgow extensions
   ; checkTc gla_exts $ badSigTyDecl tc_name
@@ -626,9 +627,10 @@ tcTyClDecl1 _calc_isrec
   -- kind signature for an indexed data type
 tcTyClDecl1 _calc_isrec 
   (TyData {tcdND = new_or_data, tcdCtxt = ctxt, tcdTyVars = tvs,
-	   tcdLName = L _ tc_name, tcdKindSig = mb_ksig, tcdCons = []})
+	   tcdLName = L _ tc_name, tcdKindSig = Just ksig, tcdCons = []})
   = tcTyVarBndrs tvs  $ \ tvs' -> do 
-  { extra_tvs <- tcDataKindSig mb_ksig
+  { traceTc (text "data/newtype family: " <+> ppr tc_name) 
+  ; extra_tvs <- tcDataKindSig (Just ksig)
   ; let final_tvs = tvs' ++ extra_tvs    -- we may not need these
 
   ; checkTc (null . unLoc $ ctxt) $ badKindSigCtxt tc_name