OK, it's a block scope thing, because using an "if" statement I can also 
violate the rule that "at least one of the non-blank variables is new".

https://go.dev/play/p/9_B8OZQFe_n

func main() {
var code int
var err error
if code, err := myfunc(); err != nil {  // this is accepted
fmt.Printf("Error: %s", err)
_ = code
return
}
fmt.Printf("code is %d, err is %v", code, err)  // 0, <nil>
}

So I need to imagine a curly bracket enclosing the whole 'if' statement.

Sorry for the noise.

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