Update: I think now that there is no universal answer to this question. We can return both errors using the technique explained in the answer. I think that the most important thing here is not to forget the case when we have two errors and somehow handle it.
Notes: There are many questions on SO about how to return an error from deferred function. This is not a question here.
(In Go) What is the proper way to return an error from a deferred function when the function is already returning an error. For example
func errorMaker() (err error) {
defer func() {
err = errors.New("Deferred error")
}()
err = errors.New("Some error")
return
}
func main() {
err := errorMaker()
fmt.Printf("Error: %v
", err)
}
In the code above the error returned by the deferred function overwrites the error returned by the function. What is the canonical way to return both errors? If another programmer uses my function what result might she expect from the function when the function returns 'two errors'?
Should I use Error wrapping for this?
Additional notes:
- As @Volker says in his comment I write some application specific handling for this error. Because I know what should be done based on nature of the errors.
- I think my question is - if I want to return all errors from the function what is the best way to combine them in my scenario?