variable 'xxx' unsafe in 'case'的處理

問題描述：

case get(?Player_LoopTaskInfo) of{TargetCnt, TaskStar, TaskExp} ->ok;_ ->throw("not_found_loop_task_info")    
end

在case語句中，這樣寫，編譯時，會提示變量unsafe，解決編譯器報錯的方法有下面兩個：

1、給unsafe的變量賦值

case get(?Player_LoopTaskInfo) of{TargetCnt, TaskStar, TaskExp} ->ok;_ ->TargetCnt=0,TaskStar=0,TaskExp=0,throw("not_found_loop_task_info")    
end

2、把case語句拆成函數

{TargetCnt, TaskStar, TaskExp} = valid_task_info(get(?Player_LoopTaskInfo))
valid_task_info({_, _, _} = Info) -> Info;
valid_task_info(_) -> throw("not_found_loop_task_info").