Also, I may be missing the point, but does the following do what you want?
https://play.golang.org/p/86DQD5QMbJ3
_, err := os.Open("non-existing")
if pe := (&os.PathError{}); errors.As(err, &pe) {
fmt.Println("Failed at path:", pe.Path)
}
On Sunday, 19 September 2021 at 12:24:13 UTC+1 Brian Candler wrote:
> I notice at least three things from your proposed syntax:
>
> 1. Passing a *type* as an argument ("os.PathError"), rather than a *value
> of a type*
> 2. A control structure. This might involve passing a block of code as a
> hidden argument (like blocks in Ruby), or some sort of macro expansion.
> 3. The syntax "pathError -> fmt.Println"; I can't see what this is
> supposed to do.
>
> I don't know which of these (or all of them) is critical to your idea, but
> I think they need to be identified separately.
>
> On Sunday, 19 September 2021 at 10:33:00 UTC+1 Haddock 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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