`sig
val zero : int64
val one : int64
val minus_one : int64
external neg : int64 -> int64 = "%int64_neg"
external add : int64 -> int64 -> int64 = "%int64_add"
external sub : int64 -> int64 -> int64 = "%int64_sub"
external mul : int64 -> int64 -> int64 = "%int64_mul"
external div : int64 -> int64 -> int64 = "%int64_div"
val unsigned_div : int64 -> int64 -> int64
external rem : int64 -> int64 -> int64 = "%int64_mod"
val unsigned_rem : int64 -> int64 -> int64
val fdiv : int64 -> int64 -> int64
val cdiv : int64 -> int64 -> int64
val ediv : int64 -> int64 -> int64
val erem : int64 -> int64 -> int64
val succ : int64 -> int64
val pred : int64 -> int64
val abs : int64 -> int64
val max_int : int64
val min_int : int64
external logand : int64 -> int64 -> int64 = "%int64_and"
external logor : int64 -> int64 -> int64 = "%int64_or"
external logxor : int64 -> int64 -> int64 = "%int64_xor"
val lognot : int64 -> int64
external shift_left : int64 -> int -> int64 = "%int64_lsl"
external shift_right : int64 -> int -> int64 = "%int64_asr"
external shift_right_logical : int64 -> int -> int64 = "%int64_lsr"
external of_int : int -> int64 = "%int64_of_int"
external to_int : int64 -> int = "%int64_to_int"
val unsigned_to_int : int64 -> int option
external of_float : float -> int64 = "caml_int64_of_float"
"caml_int64_of_float_unboxed" [@@unboxed] [@@noalloc]
external to_float : int64 -> float = "caml_int64_to_float"
"caml_int64_to_float_unboxed" [@@unboxed] [@@noalloc]
external of_int32 : int32 -> int64 = "%int64_of_int32"
external to_int32 : int64 -> int32 = "%int64_to_int32"
external of_nativeint : nativeint -> int64 = "%int64_of_nativeint"
external to_nativeint : int64 -> nativeint = "%int64_to_nativeint"
external of_string : string -> int64 = "caml_int64_of_string"
val of_string_opt : string -> int64 option
val to_string : int64 -> string
external bits_of_float : float -> int64 = "caml_int64_bits_of_float"
"caml_int64_bits_of_float_unboxed" [@@unboxed] [@@noalloc]
external float_of_bits : int64 -> float = "caml_int64_float_of_bits"
"caml_int64_float_of_bits_unboxed" [@@unboxed] [@@noalloc]
type t = int64
val compare : Int64.t -> Int64.t -> int
val unsigned_compare : Int64.t -> Int64.t -> int
val equal : Int64.t -> Int64.t -> bool
val min : Int64.t -> Int64.t -> Int64.t
val max : Int64.t -> Int64.t -> Int64.t
val popcount : Int64.t -> int
val unsigned_bitsize : Int64.t -> int
val signed_bitsize : Int64.t -> int
val leading_zeros : Int64.t -> int
val leading_sign_bits : Int64.t -> int
val trailing_zeros : Int64.t -> int
val seeded_hash : int -> Int64.t -> int
val hash : Int64.t -> int
end`