module String: sig .. end
val length : string -> int
val get : string -> int -> char
val set : string -> int -> char -> unit
val create : int -> string
val make : int -> char -> string
val copy : string -> string
val sub : string -> pos:int -> len:int -> string
val fill : string -> pos:int -> len:int -> char -> unit
val blit : src:string -> src_pos:int -> dst:string -> dst_pos:int -> len:int -> unit
val concat : sep:string -> string list -> string
val iter : f:(char -> unit) -> string -> unit
val trim : string -> string
val escaped : string -> string
val index : string -> char -> int
val rindex : string -> char -> int
val index_from : string -> int -> char -> int
val rindex_from : string -> int -> char -> int
val contains : string -> char -> bool
val contains_from : string -> int -> char -> bool
val rcontains_from : string -> int -> char -> bool
val uppercase : string -> string
val lowercase : string -> string
val capitalize : string -> string
val uncapitalize : string -> string
type string
val compare : t -> t -> int
val unsafe_get : string -> int -> char
val unsafe_set : string -> int -> char -> unit
val unsafe_blit : src:string -> src_pos:int -> dst:string -> dst_pos:int -> len:int -> unit
val unsafe_fill : string -> pos:int -> len:int -> char -> unit