src/Tools/Metis/metis_env.ML

farewell to old-style mem infixes -- type inference in situations with mem_int and mem_string should provide enough information to resolve the type of (op =)

(* Metis-specific ML environment *)
nonfix ++ -- RL;
val explode = String.explode;
val implode = String.implode;
val print = TextIO.print;
val foldl = List.foldl;
val foldr = List.foldr;