If you declare format strings for Printf-style functions outside a string
literal, make them const values.
This helps go vet perform static analysis of the format string.
| Bad | Good |
|---|---|
msg := "unexpected values %v, %v\n"
fmt.Printf(msg, 1, 2) |
const msg = "unexpected values %v, %v\n"
fmt.Printf(msg, 1, 2) |