Module Trace_core.Meta_map
type t = {m : {exn_pair}1 M.t;
}val mem : (module KEY_IMPL with type t = 'a) -> t -> boolval find_exn : 'a Key.t -> t -> 'a0val find : 'a Key.t -> t -> 'b optionval add : 'a Key.t -> 'a0 -> t -> tval iter : (binding -> unit) -> t -> unit