Thx, examples helped allot in understanding On Thursday, October 24, 2019 at 6:53:32 PM UTC+2, Jake Montgomery wrote: > > I have not done much with the new errors stuff, but I'll try to help. > > I assume you have read https://github.com/golang/go/wiki/ErrorValueFAQ > and https://blog.golang.org/go1.13-errors. There may be other posts as > well. > > These new error functions, Is() and As() are about error types. It looks > like you are trying to transform an error of type PathErr into another > error of type PathErr with a different value. That's not how it works. > > I think most of the time As() will work because the error wraps another > error of a different type. In that case the error should implement Unwrap() > not As(). If your error encapsulates multiple error types, then you would > need to implement As(). At least that is my understanding. For example, > taking your code, and modifying it, so that PathErr can also be treated as > an OtherErr could look like https://play.golang.org/p/qa4VU0PEP3v. But > again, since there is only one type encompassed in PathErr, I think this > might be more easily done with Unwrap like this: > https://play.golang.org/p/v4gDgtlNxcQ > > Good luck. > > > On Thursday, October 24, 2019 at 4:26:25 AM UTC-4, Gert wrote: >> >> Hi, I fail to understand how the custom As is suppose to work? >> >> see example https://play.golang.org/p/tjuItX5dHoJ >> >>
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