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 commenti) (0 reazioni) (0 assegnatari)Go (19.008 fork)batch import

AnalysisNeedsFixhelp wanted

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by RyanneDolan:

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Direzione di ricerca: Ispeziona il codice dello strumento cmd/vet per trovare dove le assegnazioni ai campi delle struct o agli elementi degli array contrassegnano l'operando sinistro come utilizzato e modificalo per contrassegnarlo solo quando l'espressione appare a destra.
Tech stack: go
Dominio: backend
Tipo issue: Bug
Difficoltà: 2
Tempo stimato: 1-3 ore
Stato attività: Attiva
Chiarezza: Chiara
Prerequisiti: Go
Adatta ai principianti: 60

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