`include module type of struct include Stdlib.Char end`
`type t = char`
`val code : char -> int`
`val chr : int -> char`
`val escaped : char -> string`
`val compare : t -> t -> int`
`val equal : t -> t -> bool`
`module Ascii : sig ... end`
`val lowercase_ascii : char -> char`
`val uppercase_ascii : char -> char`
`val seeded_hash : int -> t -> int`
`val hash : t -> int`
`val unsafe_chr : int -> char`
`val (<) : char -> char -> bool`
`val (<=) : char -> char -> bool`
`val (<>) : char -> char -> bool`
`val (=) : char -> char -> bool`
`val (>) : char -> char -> bool`
`val (>=) : char -> char -> bool`
`val is_letter : char -> bool`
`val is_digit : char -> bool`