Function compat53_checkmode

extlibs/sol3/include/sol/sol.hpp:2805–2811

}

static int compat53_checkmode(lua_State *L, const char *mode, const char *modename, int err) {
	if (mode && strchr(mode, modename[0]) == NULL) {
		lua_pushfstring(L, "attempt to load a %s chunk (mode is '%s')", modename, mode);
		return err;
	}
	return LUA_OK;
}

typedef struct {
	lua_Reader reader;