The controversy between try and explicit error checking is why I wrote this proposal, to provide a compromise that's both explicit and terse.
On Fri, Jul 5, 2019, 11:08 PM Liam Breck <networkimp...@gmail.com> wrote: > I've expanded the proposal to address feedback from the Go team. It now > offers a more special purpose construct than the generic if-variant 'on'. > > See the Critiques section in > https://github.com/golang/go/issues/32611 > > > On Tue, Jul 2, 2019, 12:57 PM Liam <networkimp...@gmail.com> wrote: > >> This proposal has attracted modest attention from the Go team... >> https://github.com/golang/go/issues/32611 >> >> It suggests: >> >> err := f() >> on err, <single_statement> >> >> on err, return err // any type can be tested for non-zero >> on err, return fmt.Errorf(...) >> >> on err, fmt.Println(err) // doesn't stop the function >> on err, continue // retry in a loop >> >> on err, goto label // labeled handler invocation >> on err, hname // named handler invocation >> >> >> >> And offers these possible extensions: >> >> on err, os.IsNotExist(err): <stmt> >> on err, err == io.EOF: <stmt> >> on err, err.(*os.PathError): <stmt> // doesn't panic if not a match >> >> on err, <condition>: <stmt> >> on err: <stmt> // this pair provides if/else in 2 lines >> >> on err := f(), <stmt> // for assignment with single lvalue >> >> >> >> Other punctuation is possible, e.g. on (err) <stmt> >> >> Now if we could just convince the Go gods to prototype this along with >> try() in 1.14 :-) >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "golang-nuts" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/golang-nuts/4Djft8snCjM/unsubscribe. >> To unsubscribe from this group and all its topics, 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/1b7ab9bd-0c1b-4658-8ee2-a36544b58f20%40googlegroups.com >> <https://groups.google.com/d/msgid/golang-nuts/1b7ab9bd-0c1b-4658-8ee2-a36544b58f20%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > -- 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/CAKvHMgQpFe-tOuDyYfVE%3DzfLUjZgk5nq%3D5Hdh8wXE_v3cmq75Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
