module Char:sig..end
Character operations.
Characters are the elements of string and bytes
    values. Characters represent bytes, that is an integer in the
    range [0x00;0xFF].
Some of the functions of this module interpret the characters in
    the range [0x00;0x7F] as the characters of the ASCII character
    set.
typet =char
An alias for the type of characters.
val code : char -> intReturn the integer code of the argument.
val chr : int -> charReturn the character with the given integer code.
Invalid_argument if the argument is
   outside the range [0x00;0xFF].val escaped : char -> stringReturn a string representing the given character,
    with special characters escaped following the lexical conventions
    of OCaml.
    All characters outside the ASCII printable range [0x20;0x7E] are
    escaped, as well as backslash, double-quote, and single-quote.
See also the Char.Ascii module.
val compare : t -> t -> intval equal : t -> t -> boolThe equal function for chars.
module Ascii:sig..end
ASCII character set support.
val lowercase_ascii : char -> charUse the equivalent Char.Ascii.lowercase instead.
val uppercase_ascii : char -> charUse the equivalent Char.Ascii.uppercase instead.
val seeded_hash : int -> t -> intA seeded hash function for characters, with the same output value as
    Hashtbl.seeded_hash. This function allows this module to be passed as
    argument to the functor Hashtbl.MakeSeeded.
val hash : t -> intAn unseeded hash function for characters, with the same output value as
    Hashtbl.hash. This function allows this module to be passed as argument
    to the functor Hashtbl.Make.