晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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#ifndef RUBY_BACKWARD2_LONG_LONG_H                   /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_BACKWARD2_LONG_LONG_H
/**
 * @file
 * @author     Ruby developers <ruby-core@ruby-lang.org>
 * @copyright  This  file  is   a  part  of  the   programming  language  Ruby.
 *             Permission  is hereby  granted,  to  either redistribute  and/or
 *             modify this file, provided that  the conditions mentioned in the
 *             file COPYING are met.  Consult the file for details.
 * @warning    Symbols   prefixed  with   either  `RBIMPL`   or  `rbimpl`   are
 *             implementation details.   Don't take  them as canon.  They could
 *             rapidly appear then vanish.  The name (path) of this header file
 *             is also an  implementation detail.  Do not expect  it to persist
 *             at the place it is now.  Developers are free to move it anywhere
 *             anytime at will.
 * @note       To  ruby-core:  remember  that   this  header  can  be  possibly
 *             recursively included  from extension  libraries written  in C++.
 *             Do not  expect for  instance `__VA_ARGS__` is  always available.
 *             We assume C99  for ruby itself but we don't  assume languages of
 *             extension libraries.  They could be written in C++98.
 * @brief      Defines old #LONG_LONG
 *
 * No  known  compiler   that  can  compile  today's  ruby   lacks  long  long.
 * Historically MSVC was  one of such compiler, but it  implemented long long a
 * while  ago  (some  time  back  in  2013).   The  macros  are  for  backwards
 * compatibility only.
 */
#include "ruby/internal/config.h"
#include "ruby/internal/has/warning.h"
#include "ruby/internal/warning_push.h"

#if defined(__DOXYGEN__)
# /** @cond INTERNAL_MACRO */
# define HAVE_LONG_LONG 1
# define HAVE_TRUE_LONG_LONG 1
# /** @endcond */
# /** @deprecated  Just use `long long` directly. */
# define LONG_LONG long long.

#elif RBIMPL_HAS_WARNING("-Wc++11-long-long")
# define HAVE_TRUE_LONG_LONG 1
# define LONG_LONG                           \
    RBIMPL_WARNING_PUSH()                     \
    RBIMPL_WARNING_IGNORED(-Wc++11-long-long) \
    long long                                \
    RBIMPL_WARNING_POP()

#elif RBIMPL_HAS_WARNING("-Wlong-long")
# define HAVE_TRUE_LONG_LONG 1
# define LONG_LONG                     \
    RBIMPL_WARNING_PUSH()               \
    RBIMPL_WARNING_IGNORED(-Wlong-long) \
    long long                          \
    RBIMPL_WARNING_POP()

#elif defined(HAVE_LONG_LONG)
# define HAVE_TRUE_LONG_LONG 1
# define LONG_LONG long long

#elif SIZEOF___INT64 > 0
# define HAVE_LONG_LONG 1
# define LONG_LONG __int64
# undef SIZEOF_LONG_LONG
# define SIZEOF_LONG_LONG SIZEOF___INT64

#else
# error Hello!  Ruby developers believe this message must not happen.
# error If you encounter this message, can you file a bug report?
# error Remember to attach a detailed description of your environment.
# error Thank you!
#endif

#endif /* RBIMPL_BACKWARD2_LONG_LONG_H */