module String: sig .. end
sig
end
include StringLabels
val get_exn : string -> int -> char
string -> int -> char
val get : string -> index:int -> char option
string -> index:int -> char option
val sub_exn : string -> pos:int -> len:int -> string
string -> pos:int -> len:int -> string
val find_index : string -> char:char -> int option
string -> char:char -> int option