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_CFG_H
#define Py_INTERNAL_CFG_H
#ifdef __cplusplus
extern "C" {
#endif

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

#include "pycore_compile.h"
#include "pycore_instruction_sequence.h"
#include "pycore_opcode_utils.h"

struct _PyCfgBuilder;

int _PyCfgBuilder_UseLabel(struct _PyCfgBuilder *g, _PyJumpTargetLabel lbl);
int _PyCfgBuilder_Addop(struct _PyCfgBuilder *g, int opcode, int oparg, _Py_SourceLocation loc);

struct _PyCfgBuilder* _PyCfgBuilder_New(void);
void _PyCfgBuilder_Free(struct _PyCfgBuilder *g);
int _PyCfgBuilder_CheckSize(struct _PyCfgBuilder* g);

int _PyCfg_OptimizeCodeUnit(struct _PyCfgBuilder *g, PyObject *consts, PyObject *const_cache,
                            int nlocals, int nparams, int firstlineno);

int _PyCfg_ToInstructionSequence(struct _PyCfgBuilder *g, _PyInstructionSequence *seq);
int _PyCfg_OptimizedCfgToInstructionSequence(struct _PyCfgBuilder *g, _PyCompile_CodeUnitMetadata *umd,
                                             int code_flags, int *stackdepth, int *nlocalsplus,
                                             _PyInstructionSequence *seq);

PyCodeObject *
_PyAssemble_MakeCodeObject(_PyCompile_CodeUnitMetadata *u, PyObject *const_cache,
                           PyObject *consts, int maxdepth, _PyInstructionSequence *instrs,
                           int nlocalsplus, int code_flags, PyObject *filename);

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