luaL_Reg
typedef struct luaL_Reg {
  const char *name;
  lua_CFunction func;
} luaL_Reg;
 Type for arrays of functions to be registered by luaL_setfuncs. name is the function name and func is a pointer to the function. Any array of luaL_Reg must end with a sentinel entry in which both name and func are NULL. 
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