type t = {
co_name : string;
co_nlocals : int;
co_argcount : int;
co_posonlyargcount : int;
co_kwonlyargcount : int;
co_cellvars : string array;
co_freevars : string array;
co_names : string array;
co_varnames : string array;
has_star_arguments : bool;
has_star_keywords : bool;
is_generator : bool;
}