X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcInstDcls.lhs;h=c6105949e9165ae6d9e444e08782b2541a4b77f8;hb=1525a5819aa3a6eae8d8b05cfe348a2384da0c84;hp=45338d0a1eced7142a06bad9fe3735ddb7d1f1e2;hpb=0065d5ab628975892cea1ec7303f968c3338cbe1;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcInstDcls.lhs b/compiler/typecheck/TcInstDcls.lhs
index 45338d0..c610594 100644
--- a/compiler/typecheck/TcInstDcls.lhs
+++ b/compiler/typecheck/TcInstDcls.lhs
@@ -51,7 +51,6 @@ pass, when the class-instance envs and GVE contain all the info from
 all the instance and value decls.  Indeed that's the reason we need
 two passes over the instance decls.
 
-
 Here is the overall algorithm.
 Assume that we have an instance declaration
 
@@ -451,7 +450,10 @@ tcMethods origin clas inst_tyvars' dfun_theta' inst_tys'
     let
 	prag_fn	       = mkPragFun uprags
 	all_insts      = avail_insts ++ catMaybes meth_insts
-	tc_method_bind = tcMethodBind inst_tyvars' dfun_theta' all_insts prag_fn
+	sig_fn n       = Just []	-- No scoped type variables, but every method has
+					-- a type signature, in effect, so that we check
+					-- the method has the right type
+	tc_method_bind = tcMethodBind inst_tyvars' dfun_theta' all_insts sig_fn prag_fn
 	meth_ids       = [meth_id | (_,meth_id,_) <- meth_infos]
     in