Check the original proposal [1] and discussion [2] as well as the unofficial package [3][4]. [1] https://go.googlesource.com/proposal/+/master/design/29934-err

Check the original proposal [1] and discussion [2] as well as the unofficial package [3][4]. [1] https://go.googlesource.com/proposal/+/master/design/29934-error-values.md https://go.googlesource.com/proposal/+/master/design/29934-e... [2] https://github.com/golang/go/issues/29934 https://github.com/golang/go/issues/29934 [3] https://github.com/pkg/errors https://github.com/pkg/errors [4] https://github.com/pkg/errors/tree/c978824 https://github.com/pkg/errors/tree/c978824