proposal: Go 2: Error-Handling Paradigm with !err Grammar Sugar

[xiaokentrl]

Hi, if you like this idea please give a heart emoji to me, Thank you very much

func copy(src, dst string) (int64, error) {

    r, err := os.Open("input.txt")
    if err != nil {
        return 0, err
    }
    defer r.Close()
 
    w, err := os.Create("output.txt")
    if err != nil {
        return 0, err
    }
    defer w.Close()
    
    if _, err = io.Copy(w, r); err != nil {
        return 0, err
    }
    return 0, err
}

Add keywords listen:

listen: err {
    if err != nil  {
        return 0, err
    }
    return 0, nil
}()

func copy(src, dst string) (int64, error) {
    listen:
    
    r, err := os.Open("input.txt")
    defer r.Close()
 
    w, err := os.Create("output.txt")
    defer w.Close()

    _, err = io.Copy(w, r) 
}

[xiaokentrl]

listen: err | err2 {
    if err != nil  {
        return 0, err
    }
    return 0, nil
}()

func copy(src, dst string) (int64, error) {
    listen:  
    
    r, err := os.Open("input.txt")
    defer r.Close()
 
    w, err := os.Create("output.txt")
    defer w.Close()

    _, err = io.Copy(w, r) 
}

[seankhliao]

Please fill out https://github.com/golang/proposal/blob/master/go2-language-changes.md when proposing language changes

[mpldr]

I have to admit, I am a bit stumped by the syntax… is this basically a label outside the function? What is err2? What is the proposed functionality exactly. Why does the listen "label-function" not have any parameters? why does your example return 0 and not the bytecount of copy? So many questions!

[gopherbot]

Timed out in state WaitingForInfo. Closing.

(I am just a bot, though. Please speak up if this is a mistake or you have the requested information.)