src/Pure/Isar/method.ML

 type modifier = (Proof.context -> Proof.context) * attribute;
 
 local
 
 fun thms ss = Scan.repeat (Scan.unless (Scan.lift (Scan.first ss)) Attrib.multi_thm) >> flat;
-fun app (f, att) (context, ths) = foldl_map att (Context.map_proof f context, ths);
+fun app (f, att) (context, ths) = Library.foldl_map att (Context.map_proof f context, ths);
 
 fun section ss = Scan.depend (fn context => (Scan.first ss -- Scan.pass context (thms ss)) :|--
   (fn (m, ths) => Scan.succeed (app m (context, ths))));
 
 fun sectioned args ss = args -- Scan.repeat (section ss);