(* failwithf is a printf-like version of failwith. *)
val failwithf : ('a, unit, string, 'b) format4 -> 'a
+(* Return the list of integers [a..b] (inclusive). *)
+val range : int -> int -> int list
+
(* Read a configuration file as a list of (lineno, key, value) pairs.
* If the config file is missing this returns an empty list.
*)
(* Pad or truncate a string to a fixed width. *)
val pad : int -> string -> string
+(* Take up to n elements of xs, if available. *)
+val list_take : int -> 'a list -> 'a list
+
+(* Apply function f to [Some v], return default for [None] *)
+val map_default : ('a -> 'b) -> 'b -> 'a option -> 'b
+
(* Int64 operators for convenience. *)
val (+^) : int64 -> int64 -> int64
val (-^) : int64 -> int64 -> int64