On Sun, Sep 19, 2021 at 4:02 PM David Finkel <david.fin...@gmail.com> wrote:
> You might be interested in the original draft proposal for errors.As: > > https://go.googlesource.com/proposal/+/master/design/go2draft-error-inspection.md#the-is-and-as-functions > > In particular, it originally specified that errors.As would take a > type-parameter. (the version of generics that was proposed concurrently > with that proposal was not accepted so they had to go with the current > (clunkier) interface). > Hmm, actually, the code in that proposal for the generic version of errors.As works almost unchanged: https://go2goplay.golang.org/p/ddPDlk00Cbl (I just had to change the type-parameter syntax) > On Sun, Sep 19, 2021 at 5:33 AM Haddock <ffm2...@web.de> wrote: > >> >> I like the way error handling is done in the xerror package. Things >> become more concise, but remain very easy to read and understand as in >> plain Go errorhandling. >> >> Here is the example of how to use xerror.As: >> >> _, err := os.Open("non-existing") >> if err != nil { >> var pathError *os.PathError >> if xerrors.As(err, &pathError) { >> fmt.Println("Failed at path:", pathError.Path) >> } >> } >> >> My idea is to make this even shorter like this: >> >> _, err := os.Open("non-existing") >> myerrors.As(err, os.PathError) { >> pathError -> fmt.Println("Failed at path:", pathError.Path) >> } >> >> Think something like that has so far not been suggested. That's why I >> thought it is justified to drop comment. >> >> myerrors.As would also do the check if err is nil. The code in my sample >> is not valid Go code, I know. It is only pseudo code to show the idea. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "golang-nuts" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to golang-nuts+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/golang-nuts/629e6763-36a9-4d7d-991c-fd71dd384d0en%40googlegroups.com >> <https://groups.google.com/d/msgid/golang-nuts/629e6763-36a9-4d7d-991c-fd71dd384d0en%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CANrC0BgsVSo0hv5UtTi%3DVXZYZODys1H-kvB63o2B3UThBMnfxQ%40mail.gmail.com.
