Not really. It's idiomatic to use a single "err" variable for every error value in the same function body, and the compiler will only check whether that variabl

Not really. It's idiomatic to use a single "err" variable for every error value in the same function body, and the compiler will only check whether that variable is used at least once; it doesn't perform a data flow analysis to ensure that every value that might be assigned is used. So if you assign 10 different error results to the same variable at various points, but only actually check it 9 times and forget the 10th, the compiler will not tell you that anything's wrong.