/usr/lib/ats-anairiats-0.2.11/prelude/SATS/option.sats is in ats-lang-anairiats 0.2.11-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(* *)
(* Applied Type System *)
(* *)
(* Hongwei Xi *)
(* *)
(***********************************************************************)
(*
** ATS - Unleashing the Potential of Types!
** Copyright (C) 2002-2008 Hongwei Xi, Boston University
** All rights reserved
**
** ATS is free software; you can redistribute it and/or modify it under
** the terms of the GNU LESSER GENERAL PUBLIC LICENSE as published by the
** Free Software Foundation; either version 2.1, or (at your option) any
** later version.
**
** ATS is distributed in the hope that it will be useful, but WITHOUT ANY
** WARRANTY; without even the implied warranty of MERCHANTABILITY or
** FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
** for more details.
**
** You should have received a copy of the GNU General Public License
** along with ATS; see the file COPYING. If not, please write to the
** Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
** 02110-1301, USA.
*)
(* ****** ****** *)
(* author: Hongwei Xi (hwxi AT cs DOT bu DOT edu) *)
(* ****** ****** *)
#include "prelude/params.hats"
(* ****** ****** *)
#if VERBOSE_PRELUDE #then
#print "Loading [option.sats] starts!\n"
#endif
(* ****** ****** *)
%{#
#include "prelude/CATS/option.cats"
%}
(* ****** ****** *)
(*
// this is defined in [basics_sta.sats"
datatype // t@ype+: covariant
option_t0ype_bool_type (a:t@ype+, bool) =
| None (a, false) | Some (a, true) of a
// end of [datatype]
stadef option = option_t0ype_bool_type
typedef Option (a:t@ype) = [b:bool] option (a, b)
*)
(* ****** ****** *)
fun option_is_none
{a:t@ype} {b:bool} (opt: option (a, b)):<> bool (~b)
fun option_is_some
{a:t@ype} {b:bool} (opt: option (a, b)):<> bool ( b)
(* ****** ****** *)
fun{a:type} option_some (x: a):<> option (a, true)
fun{a:type} option_unsome (opt: option (a, true)):<> a
fun{a:type} option_none ((*void*)):<> option (a, false)
(* ****** ****** *)
fun{a:t@ype} option_app {f:eff}
(opt: Option a, f: a -<f> void):<f> void
fun{a1,a2:t@ype} option_map {b:bool} {f:eff}
(opt: option (a1, b), f: a1 -<f> a2):<f> option (a2, b)
(* ****** ****** *)
//
// HX: a casting function implemented in [prelude/DATS/option.dats]
//
castfn option_of_option_vt
{a:t@ype} {b:bool} (x: option_vt (a, b)):<> option (a, b)
// end of [option_of_option_vt]
(* ****** ****** *)
#if VERBOSE_PRELUDE #then
#print "Loading [option.sats] finishes!\n"
#endif
(* end of [option.sats] *)
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