module List: sig .. end
sig
end
val nth_opt : 'a list -> int -> 'a option
'a list -> int -> 'a option
4.05
val find_opt : ('a -> bool) -> 'a list -> 'a option
('a -> bool) -> 'a list -> 'a option
val assoc_opt : 'a -> ('a * 'b) list -> 'b option
'a -> ('a * 'b) list -> 'b option
val assq_opt : 'a -> ('a * 'b) list -> 'b option