isDataTyCon should be False for all type families, even data type families

[ghc-hetmet.git] / compiler / typecheck / TcGadt.lhs

diff --git a/compiler/typecheck/TcGadt.lhs b/compiler/typecheck/TcGadt.lhs
index 3761c68..4cd7e00 100644 (file)
--- a/compiler/typecheck/TcGadt.lhs
+++ b/compiler/typecheck/TcGadt.lhs
@@ -14,7 +14,6 @@ module TcGadt (
        Refinement, emptyRefinement, isEmptyRefinement, 
        gadtRefine, 
        refineType, refinePred, refineResType,
-       dataConCanMatch,
        tcUnifyTys, BindFlag(..)
   ) where
 
@@ -242,29 +241,10 @@ fixTvSubstEnv in_scope env
     fixpt = mapVarEnv (substTy (mkTvSubst in_scope fixpt)) env
 
 ----------------------------
-dataConCanMatch :: [Type] -> DataCon -> Bool
--- Returns True iff the data con can match a scrutinee of type (T tys)
---                 where T is the type constructor for the data con
---
--- Instantiate the equations and try to unify them
-dataConCanMatch tys con
-  | null eq_spec      = True   -- Common
-  | all isTyVarTy tys = True   -- Also common
-  | otherwise
-  = isJust (tcUnifyTys (\tv -> BindMe) 
-                      (map (substTyVar subst . fst) eq_spec)
-                      (map snd eq_spec))
-  where
-    dc_tvs  = dataConUnivTyVars con
-    eq_spec = dataConEqSpec con
-    subst   = zipTopTvSubst dc_tvs tys
-
-----------------------------
 tryToBind :: TyVarSet -> TyVar -> BindFlag
 tryToBind tv_set tv | tv `elemVarSet` tv_set = BindMe
                    | otherwise              = AvoidMe
 
-
 \end{code}