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+(***********************************************************************)
+(*                                                                     *)
+(*                           Objective Caml                            *)
+(*                                                                     *)
+(*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         *)
+(*                                                                     *)
+(*  Copyright 1996 Institut National de Recherche en Informatique et   *)
+(*  en Automatique.  All rights reserved.  This file is distributed    *)
+(*  under the terms of the GNU Library General Public License, with    *)
+(*  the special exception on linking described in file ../LICENSE.     *)
+(*                                                                     *)
+(***********************************************************************)
+
+(* $Id$ *)
+
+(** List operations.
+
+   Some functions are flagged as not tail-recursive.  A tail-recursive
+   function uses constant stack space, while a non-tail-recursive function
+   uses stack space proportional to the length of its list argument, which
+   can be a problem with very long lists.  When the function takes several
+   list arguments, an approximate formula giving stack usage (in some
+   unspecified constant unit) is shown in parentheses.
+
+   The above considerations can usually be ignored if your lists are not
+   longer than about 10000 elements.
+*)
+
+val length : 'a list -> int
+(** Return the length (number of elements) of the given list. *)
+
+val hd : 'a list -> 'a
+(** Return the first element of the given list. Raise
+   [Failure "hd"] if the list is empty. *)
+
+val tl : 'a list -> 'a list
+(** Return the given list without its first element. Raise
+   [Failure "tl"] if the list is empty. *)
+
+val nth : 'a list -> int -> 'a
+(** Return the [n]-th element of the given list.
+   The first element (head of the list) is at position 0.
+   Raise [Failure "nth"] if the list is too short.
+   Raise [Invalid_argument "List.nth"] if [n] is negative. *)
+
+val rev : 'a list -> 'a list
+(** List reversal. *)
+
+val append : 'a list -> 'a list -> 'a list
+(** Catenate two lists.  Same function as the infix operator [@].
+   Not tail-recursive (length of the first argument).  The [@]
+   operator is not tail-recursive either. *)
+
+val rev_append : 'a list -> 'a list -> 'a list
+(** [List.rev_append l1 l2] reverses [l1] and concatenates it to [l2].
+   This is equivalent to {!ListLabels.rev}[ l1 @ l2], but [rev_append] is
+   tail-recursive and more efficient. *)
+
+val concat : 'a list list -> 'a list
+(** Concatenate a list of lists.  The elements of the argument are all
+   concatenated together (in the same order) to give the result.
+   Not tail-recursive
+   (length of the argument + length of the longest sub-list). *)
+
+val flatten : 'a list list -> 'a list
+(** Same as [concat].  Not tail-recursive
+   (length of the argument + length of the longest sub-list). *)
+
+
+(** {6 Iterators} *)
+
+
+val iter : f:('a -> unit) -> 'a list -> unit
+(** [List.iter f [a1; ...; an]] applies function [f] in turn to
+   [a1; ...; an]. It is equivalent to
+   [begin f a1; f a2; ...; f an; () end]. *)
+
+val iteri : f:(int -> 'a -> unit) -> 'a list -> unit
+(** Same as {!List.iter}, but the
+   function is applied to the index of the element as first argument (counting from 0),
+   and the element itself as second argument.
+   @since 3.13.0
+*)
+
+val map : f:('a -> 'b) -> 'a list -> 'b list
+(** [List.map f [a1; ...; an]] applies function [f] to [a1, ..., an],
+   and builds the list [[f a1; ...; f an]]
+   with the results returned by [f].  Not tail-recursive. *)
+
+val mapi : f:(int -> 'a -> 'b) -> 'a list -> 'b list
+(** Same as {!List.map}, but the
+   function is applied to the index of the element as first argument (counting from 0),
+   and the element itself as second argument.
+   @since 3.13.0
+*)
+
+val rev_map : f:('a -> 'b) -> 'a list -> 'b list
+(** [List.rev_map f l] gives the same result as
+   {!ListLabels.rev}[ (]{!ListLabels.map}[ f l)], but is tail-recursive and
+   more efficient. *)
+
+val fold_left : f:('a -> 'b -> 'a) -> init:'a -> 'b list -> 'a
+(** [List.fold_left f a [b1; ...; bn]] is
+   [f (... (f (f a b1) b2) ...) bn]. *)
+
+val fold_right : f:('a -> 'b -> 'b) -> 'a list -> init:'b -> 'b
+(** [List.fold_right f [a1; ...; an] b] is
+   [f a1 (f a2 (... (f an b) ...))].  Not tail-recursive. *)
+
+
+(** {6 Iterators on two lists} *)
+
+
+val iter2 : f:('a -> 'b -> unit) -> 'a list -> 'b list -> unit
+(** [List.iter2 f [a1; ...; an] [b1; ...; bn]] calls in turn
+   [f a1 b1; ...; f an bn].
+   Raise [Invalid_argument] if the two lists have
+   different lengths. *)
+
+val map2 : f:('a -> 'b -> 'c) -> 'a list -> 'b list -> 'c list
+(** [List.map2 f [a1; ...; an] [b1; ...; bn]] is
+   [[f a1 b1; ...; f an bn]].
+   Raise [Invalid_argument] if the two lists have
+   different lengths.  Not tail-recursive. *)
+
+val rev_map2 : f:('a -> 'b -> 'c) -> 'a list -> 'b list -> 'c list
+(** [List.rev_map2 f l1 l2] gives the same result as
+   {!ListLabels.rev}[ (]{!ListLabels.map2}[ f l1 l2)], but is tail-recursive and
+   more efficient. *)
+
+val fold_left2 :
+  f:('a -> 'b -> 'c -> 'a) -> init:'a -> 'b list -> 'c list -> 'a
+(** [List.fold_left2 f a [b1; ...; bn] [c1; ...; cn]] is
+   [f (... (f (f a b1 c1) b2 c2) ...) bn cn].
+   Raise [Invalid_argument] if the two lists have
+   different lengths. *)
+
+val fold_right2 :
+  f:('a -> 'b -> 'c -> 'c) -> 'a list -> 'b list -> init:'c -> 'c
+(** [List.fold_right2 f [a1; ...; an] [b1; ...; bn] c] is
+   [f a1 b1 (f a2 b2 (... (f an bn c) ...))].
+   Raise [Invalid_argument] if the two lists have
+   different lengths.  Not tail-recursive. *)
+
+
+(** {6 List scanning} *)
+
+
+val for_all : f:('a -> bool) -> 'a list -> bool
+(** [for_all p [a1; ...; an]] checks if all elements of the list
+   satisfy the predicate [p]. That is, it returns
+   [(p a1) && (p a2) && ... && (p an)]. *)
+
+val exists : f:('a -> bool) -> 'a list -> bool
+(** [exists p [a1; ...; an]] checks if at least one element of
+   the list satisfies the predicate [p]. That is, it returns
+   [(p a1) || (p a2) || ... || (p an)]. *)
+
+val for_all2 : f:('a -> 'b -> bool) -> 'a list -> 'b list -> bool
+(** Same as {!ListLabels.for_all}, but for a two-argument predicate.
+   Raise [Invalid_argument] if the two lists have
+   different lengths. *)
+
+val exists2 : f:('a -> 'b -> bool) -> 'a list -> 'b list -> bool
+(** Same as {!ListLabels.exists}, but for a two-argument predicate.
+   Raise [Invalid_argument] if the two lists have
+   different lengths. *)
+
+val mem : 'a -> set:'a list -> bool
+(** [mem a l] is true if and only if [a] is equal
+   to an element of [l]. *)
+
+val memq : 'a -> set:'a list -> bool
+(** Same as {!ListLabels.mem}, but uses physical equality instead of structural
+   equality to compare list elements. *)
+
+
+(** {6 List searching} *)
+
+
+val find : f:('a -> bool) -> 'a list -> 'a
+(** [find p l] returns the first element of the list [l]
+   that satisfies the predicate [p].
+   Raise [Not_found] if there is no value that satisfies [p] in the
+   list [l]. *)
+
+val filter : f:('a -> bool) -> 'a list -> 'a list
+(** [filter p l] returns all the elements of the list [l]
+   that satisfy the predicate [p].  The order of the elements
+   in the input list is preserved.  *)
+
+val find_all : f:('a -> bool) -> 'a list -> 'a list
+(** [find_all] is another name for {!ListLabels.filter}. *)
+
+val partition : f:('a -> bool) -> 'a list -> 'a list * 'a list
+(** [partition p l] returns a pair of lists [(l1, l2)], where
+   [l1] is the list of all the elements of [l] that
+   satisfy the predicate [p], and [l2] is the list of all the
+   elements of [l] that do not satisfy [p].
+   The order of the elements in the input list is preserved. *)
+
+
+(** {6 Association lists} *)
+
+
+val assoc : 'a -> ('a * 'b) list -> 'b
+(** [assoc a l] returns the value associated with key [a] in the list of
+   pairs [l]. That is,
+   [assoc a [ ...; (a,b); ...] = b]
+   if [(a,b)] is the leftmost binding of [a] in list [l].
+   Raise [Not_found] if there is no value associated with [a] in the
+   list [l]. *)
+
+val assq : 'a -> ('a * 'b) list -> 'b
+(** Same as {!ListLabels.assoc}, but uses physical equality instead of
+   structural equality to compare keys. *)
+
+val mem_assoc : 'a -> map:('a * 'b) list -> bool
+(** Same as {!ListLabels.assoc}, but simply return true if a binding exists,
+   and false if no bindings exist for the given key. *)
+
+val mem_assq : 'a -> map:('a * 'b) list -> bool
+(** Same as {!ListLabels.mem_assoc}, but uses physical equality instead of
+   structural equality to compare keys. *)
+
+val remove_assoc : 'a -> ('a * 'b) list -> ('a * 'b) list
+(** [remove_assoc a l] returns the list of
+   pairs [l] without the first pair with key [a], if any.
+   Not tail-recursive. *)
+
+val remove_assq : 'a -> ('a * 'b) list -> ('a * 'b) list
+(** Same as {!ListLabels.remove_assoc}, but uses physical equality instead
+   of structural equality to compare keys.  Not tail-recursive. *)
+
+
+(** {6 Lists of pairs} *)
+
+
+val split : ('a * 'b) list -> 'a list * 'b list
+(** Transform a list of pairs into a pair of lists:
+   [split [(a1,b1); ...; (an,bn)]] is [([a1; ...; an], [b1; ...; bn])].
+   Not tail-recursive.
+*)
+
+val combine : 'a list -> 'b list -> ('a * 'b) list
+(** Transform a pair of lists into a list of pairs:
+   [combine [a1; ...; an] [b1; ...; bn]] is
+   [[(a1,b1); ...; (an,bn)]].
+   Raise [Invalid_argument] if the two lists
+   have different lengths.  Not tail-recursive. *)
+
+
+(** {6 Sorting} *)
+
+
+val sort : cmp:('a -> 'a -> int) -> 'a list -> 'a list
+(** Sort a list in increasing order according to a comparison
+   function.  The comparison function must return 0 if its arguments
+   compare as equal, a positive integer if the first is greater,
+   and a negative integer if the first is smaller (see Array.sort for
+   a complete specification).  For example,
+   {!Pervasives.compare} is a suitable comparison function.
+   The resulting list is sorted in increasing order.
+   [List.sort] is guaranteed to run in constant heap space
+   (in addition to the size of the result list) and logarithmic
+   stack space.
+
+   The current implementation uses Merge Sort. It runs in constant
+   heap space and logarithmic stack space.
+*)
+
+val stable_sort : cmp:('a -> 'a -> int) -> 'a list -> 'a list
+(** Same as {!ListLabels.sort}, but the sorting algorithm is guaranteed to
+   be stable (i.e. elements that compare equal are kept in their
+   original order) .
+
+   The current implementation uses Merge Sort. It runs in constant
+   heap space and logarithmic stack space.
+*)
+
+val fast_sort : cmp:('a -> 'a -> int) -> 'a list -> 'a list
+(** Same as {!List.sort} or {!List.stable_sort}, whichever is faster
+    on typical input. *)
+
+val merge : cmp:('a -> 'a -> int) -> 'a list -> 'a list -> 'a list
+(** Merge two lists:
+    Assuming that [l1] and [l2] are sorted according to the
+    comparison function [cmp], [merge cmp l1 l2] will return a
+    sorted list containting all the elements of [l1] and [l2].
+    If several elements compare equal, the elements of [l1] will be
+    before the elements of [l2].
+    Not tail-recursive (sum of the lengths of the arguments).
+*)