Type synonym families may be nullary

[ghc-hetmet.git] / compiler / rename / RnSource.lhs

diff --git a/compiler/rename/RnSource.lhs b/compiler/rename/RnSource.lhs
index 3c9f77f..052b7e0 100644 (file)
--- a/compiler/rename/RnSource.lhs
+++ b/compiler/rename/RnSource.lhs
@@ -926,25 +926,17 @@ rnFamily :: TyClDecl RdrName
 rnFamily (tydecl@TyFamily {tcdFlavour = flavour, 
                           tcdLName = tycon, tcdTyVars = tyvars}) 
         bindIdxVars =
-      do { checkM (isDataFlavour flavour                      -- for synonyms,
-                  || not (null tyvars)) $ addErr needOneIdx  -- no. of indexes >= 1
-        ; bindIdxVars (family_doc tycon) tyvars $ \tyvars' -> do {
+      do { bindIdxVars (family_doc tycon) tyvars $ \tyvars' -> do {
         ; tycon' <- lookupLocatedTopBndrRn tycon
         ; return (TyFamily {tcdFlavour = flavour, tcdLName = tycon', 
                              tcdTyVars = tyvars', tcdKind = tcdKind tydecl}, 
                    emptyFVs) 
          } }
-      where
-        isDataFlavour DataFamily = True
-       isDataFlavour _          = False
 rnFamily d _ = pprPanic "rnFamily" (ppr d)
 
 family_doc :: Located RdrName -> SDoc
 family_doc tycon = text "In the family declaration for" <+> quotes (ppr tycon)
 
-needOneIdx :: SDoc
-needOneIdx = text "Type family declarations requires at least one type index"
-
 -- Rename associated type declarations (in classes)
 --
 -- * This can be family declarations and (default) type instances