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 Py_INTERNAL_PARSER_H
#define Py_INTERNAL_PARSER_H
#ifdef __cplusplus
extern "C" {
#endif

#ifndef Py_BUILD_CORE
#  error "this header requires Py_BUILD_CORE define"
#endif


#include "pycore_ast.h"             // struct _expr
#include "pycore_global_strings.h"  // _Py_DECLARE_STR()
#include "pycore_pyarena.h"         // PyArena


#ifdef Py_DEBUG
#define _PYPEGEN_NSTATISTICS 2000
#endif

struct _parser_runtime_state {
#ifdef Py_DEBUG
    long memo_statistics[_PYPEGEN_NSTATISTICS];
#ifdef Py_GIL_DISABLED
    PyMutex mutex;
#endif
#else
    int _not_used;
#endif
    struct _expr dummy_name;
};

_Py_DECLARE_STR(empty, "")
#if defined(Py_DEBUG) && defined(Py_GIL_DISABLED)
#define _parser_runtime_state_INIT \
    { \
        .mutex = {0}, \
        .dummy_name = { \
            .kind = Name_kind, \
            .v.Name.id = &_Py_STR(empty), \
            .v.Name.ctx = Load, \
            .lineno = 1, \
            .col_offset = 0, \
            .end_lineno = 1, \
            .end_col_offset = 0, \
        }, \
    }
#else
#define _parser_runtime_state_INIT \
    { \
        .dummy_name = { \
            .kind = Name_kind, \
            .v.Name.id = &_Py_STR(empty), \
            .v.Name.ctx = Load, \
            .lineno = 1, \
            .col_offset = 0, \
            .end_lineno = 1, \
            .end_col_offset = 0, \
        }, \
    }
#endif

extern struct _mod* _PyParser_ASTFromString(
    const char *str,
    PyObject* filename,
    int mode,
    PyCompilerFlags *flags,
    PyArena *arena);

extern struct _mod* _PyParser_ASTFromFile(
    FILE *fp,
    PyObject *filename_ob,
    const char *enc,
    int mode,
    const char *ps1,
    const char *ps2,
    PyCompilerFlags *flags,
    int *errcode,
    PyArena *arena);
extern struct _mod* _PyParser_InteractiveASTFromFile(
    FILE *fp,
    PyObject *filename_ob,
    const char *enc,
    int mode,
    const char *ps1,
    const char *ps2,
    PyCompilerFlags *flags,
    int *errcode,
    PyObject **interactive_src,
    PyArena *arena);

#ifdef __cplusplus
}
#endif
#endif /* !Py_INTERNAL_PARSER_H */