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).
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.
>
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