cmd/vet: warn about unused struct or array, ignoring assignment to field or element · golang/go#449

2009-12-22T02:14:21.000Z

by **RyanneDolan**: What steps will reproduce the problem? v := new(struct{i int}) v.i = 1 What is the expected output? What do you see instead? Should get "v declared and not used" error. Instead, compiles fine. What is your $GOOS? $GOARCH? linux/386 Which revision are you using? (hg identify) 54392bd03d06 tip Please provide any additional information below. The dot operator should mark its left operand as "used" only when it appears on the RHS. a = 1 // 'a' is not marked as used (CORRECT) v.i = 1 // 'v' is marked as used (WRONG) a = v.i // 'v' is marked as used (CORRECT) This bug is important to fix for consistency, and because it confuses new programmers who might expect reference semantics: for _,v := range arr {v.i = 1} // doesn't do anything Mentioned here: http://groups.google.com/group/golang- nuts/browse_thread/thread/342fe61c78916496/fbb57f693f1aca72

(9 留言) (0 反應) (0 負責人)Go (19,008 fork)batch import

AnalysisNeedsFixhelp wanted

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by RyanneDolan:

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研究方向: 檢查cmd/vet工具的程式碼，找到將分配給結構體欄位或陣列元素的操作數標記為使用的位置，並修改為僅在表達式出現在右側時才標記為使用。
技術棧: go
領域: backend
議題類型: 錯誤
難度: 2
預計時間: 1-3 小時
活動狀態: 活躍
清晰度: 清晰
前置要求: Go
新手友善度: 60

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