+ cls_doc = text "the declaration for class" <+> ppr cname
+ sig_doc = text "the signatures for class" <+> ppr cname
+
+rnClassOp clas clas_tyvars clas_fds sig@(ClassOpSig op dm_stuff ty locn)
+ = pushSrcLocRn locn $
+ lookupTopBndrRn op `thenRn` \ op_name ->
+
+ -- Check the signature
+ rnHsSigType (quotes (ppr op)) ty `thenRn` \ new_ty ->
+
+ -- Make the default-method name
+ (case dm_stuff of
+ DefMeth dm_rdr_name
+ -> -- Imported class that has a default method decl
+ -- See comments with tname, snames, above
+ lookupSysBinder dm_rdr_name `thenRn` \ dm_name ->
+ returnRn (DefMeth dm_name)
+ -- An imported class decl for a class decl that had an explicit default
+ -- method, mentions, rather than defines,
+ -- the default method, so we must arrange to pull it in
+
+ GenDefMeth -> returnRn GenDefMeth
+ NoDefMeth -> returnRn NoDefMeth
+ ) `thenRn` \ dm_stuff' ->
+
+ returnRn (ClassOpSig op_name dm_stuff' new_ty locn)
+
+finishSourceTyClDecl :: RdrNameTyClDecl -> RenamedTyClDecl -> RnMS (RenamedTyClDecl, FreeVars)
+ -- Used for source file decls only
+ -- Renames the default-bindings of a class decl
+ -- the derivings of a data decl
+finishSourceTyClDecl (TyData {tcdDerivs = Just derivs, tcdLoc = src_loc}) -- Derivings in here
+ rn_ty_decl -- Everything else is here
+ = pushSrcLocRn src_loc $
+ mapRn rnDeriv derivs `thenRn` \ derivs' ->
+ returnRn (rn_ty_decl {tcdDerivs = Just derivs'}, mkNameSet derivs')
+
+finishSourceTyClDecl (ClassDecl {tcdMeths = Just mbinds, tcdLoc = src_loc}) -- Get mbinds from here
+ rn_cls_decl@(ClassDecl {tcdTyVars = tyvars}) -- Everything else is here
+ -- There are some default-method bindings (abeit possibly empty) so
+ -- this is a source-code class declaration
+ = -- The newLocals call is tiresome: given a generic class decl
+ -- class C a where
+ -- op :: a -> a
+ -- op {| x+y |} (Inl a) = ...
+ -- op {| x+y |} (Inr b) = ...
+ -- op {| a*b |} (a*b) = ...
+ -- we want to name both "x" tyvars with the same unique, so that they are
+ -- easy to group together in the typechecker.
+ -- Hence the
+ pushSrcLocRn src_loc $
+ extendTyVarEnvFVRn (map hsTyVarName tyvars) $
+ getLocalNameEnv `thenRn` \ name_env ->
+ let
+ meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
+ gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
+ not (tv `elemRdrEnv` name_env)]
+ in
+ checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
+ newLocalsRn gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars ->
+ rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
+ returnRn (rn_cls_decl {tcdMeths = Just mbinds'}, meth_fvs)
+ where
+ meth_doc = text "the default-methods for class" <+> ppr (tcdName rn_cls_decl)
+
+finishSourceTyClDecl _ tycl_decl = returnRn (tycl_decl, emptyFVs)
+ -- Not a class declaration
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Support code for type/data declarations}
+%* *
+%*********************************************************
+
+\begin{code}
+rnDeriv :: RdrName -> RnMS Name
+rnDeriv cls
+ = lookupOccRn cls `thenRn` \ clas_name ->
+ checkRn (getUnique clas_name `elem` derivableClassKeys)
+ (derivingNonStdClassErr clas_name) `thenRn_`
+ returnRn clas_name