val failwith : string -> 'a
val printf : ('a, out_channel, unit) format -> 'a
external ( |> ) : 'a -> ('a -> 'b) -> 'b = "%revapply"
external stdlib_plus_int : int -> int -> int = "%addint"
external stdlib_minus_int : int -> int -> int = "%subint"
external stdlib_multiply_int : int -> int -> int = "%mulint"
external stdlib_divide_int : int -> int -> int = "%divint"
external stdlib_mod_int : int -> int -> int = "%modint"
external stdlib_plus_float : float -> float -> float = "%addfloat"
external stdlib_minus_float : float -> float -> float = "%subfloat"
external stdlib_multiply_float : float -> float -> float = "%mulfloat"
external stdlib_divide_float : float -> float -> float = "%divfloat"
external stdlib_string_length : string -> int = "%string_length"
val stdlib_string_concat : string -> string -> string
external ( = ) : 'a -> 'a -> bool = "%equal"
external ( <> ) : 'a -> 'a -> bool = "%notequal"
external ( < ) : 'a -> 'a -> bool = "%lessthan"
external ( > ) : 'a -> 'a -> bool = "%greaterthan"
external ( <= ) : 'a -> 'a -> bool = "%lessequal"
external ( >= ) : 'a -> 'a -> bool = "%greaterequal"
external not : bool -> bool = "%boolnot"
external ( or ) : bool -> bool -> bool = "%sequor"
external ( & ) : bool -> bool -> bool = "%sequand"