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_RUBY_BACKWARD_H                         /*-*-C++-*-vi:se ft=cpp:*/
#define RUBY_RUBY_BACKWARD_H 1
/**
 * @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.
 */
#include "ruby/internal/value.h"
#include "ruby/internal/interpreter.h"
#include "ruby/backward/2/attributes.h"

#define DECLARE_DEPRECATED_FEATURE(ver, func) \
    NORETURN(ERRORFUNC(("deprecated since "#ver), DEPRECATED(void func(void))))

/* eval.c */
DECLARE_DEPRECATED_FEATURE(2.2, rb_disable_super);
DECLARE_DEPRECATED_FEATURE(2.2, rb_enable_super);

/* hash.c */
DECLARE_DEPRECATED_FEATURE(2.2, rb_hash_iter_lev);
DECLARE_DEPRECATED_FEATURE(2.2, rb_hash_ifnone);

/* string.c */
DECLARE_DEPRECATED_FEATURE(2.2, rb_str_associate);
DECLARE_DEPRECATED_FEATURE(2.2, rb_str_associated);

/* variable.c */
DEPRECATED(void rb_autoload(VALUE, ID, const char*));

/* vm.c */
DECLARE_DEPRECATED_FEATURE(2.2, rb_clear_cache);
DECLARE_DEPRECATED_FEATURE(2.2, rb_frame_pop);

#define DECLARE_DEPRECATED_INTERNAL_FEATURE(func) \
    NORETURN(ERRORFUNC(("deprecated internal function"), DEPRECATED(void func(void))))

/* eval.c */
NORETURN(ERRORFUNC(("internal function"), void rb_frozen_class_p(VALUE)));
DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_exec_end_proc);

/* error.c */
DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_compile_error);
DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_compile_error_with_enc);
DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_compile_error_append);

/* gc.c */
DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_gc_call_finalizer_at_exit);

/* signal.c */
DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_trap_exit);

/* struct.c */
DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_struct_ptr);

/* thread.c */
DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_clear_trace_func);

/* variable.c */
DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_generic_ivar_table);
NORETURN(ERRORFUNC(("internal function"), VALUE rb_mod_const_missing(VALUE, VALUE)));

/* from version.c */
#if defined(RUBY_SHOW_COPYRIGHT_TO_DIE) && !!(RUBY_SHOW_COPYRIGHT_TO_DIE+0)
/* for source code backward compatibility */
RBIMPL_ATTR_DEPRECATED(("since 2.4"))
static inline int
ruby_show_copyright_to_die(int exitcode)
{
    ruby_show_copyright();
    return exitcode;
}
#define ruby_show_copyright() /* defer EXIT_SUCCESS */ \
    (exit(ruby_show_copyright_to_die(EXIT_SUCCESS)))
#endif

#endif /* RUBY_RUBY_BACKWARD_H */