X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcGadt.lhs;h=cbb4230e748952287e090bd309411caf0c1b16fe;hb=f6a741fad12b14b102be1aca959b8d63cbb2734a;hp=987a4c66e785ebaf8fb9d776019419bc4c6fcb9d;hpb=f4510d27c5883fe7e8570f4dd49d45a8b0122f2c;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcGadt.lhs b/compiler/typecheck/TcGadt.lhs
index 987a4c6..cbb4230 100644
--- 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
 
@@ -25,7 +24,6 @@ import Coercion
 import Type
 
 import TypeRep
-import DataCon
 import Var
 import VarEnv
 import VarSet
@@ -184,7 +182,7 @@ gadtRefine (Reft in_scope env1)
     do_one reft co_var = unify reft (TyVarTy co_var) ty1 ty2
 	where
 	   (ty1,ty2) = splitCoercionKind (tyVarKind co_var)
-\end{code} 
+\end{code}
 
 %************************************************************************
 %*									*
@@ -242,29 +240,10 @@ 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}