Go Conference 2017 Autumn https://gocon.connpass.com/event/66615/ references - Gocon Spring 2016 Keynote https://dave.cheney.net/paste/gocon-spring-2016.pdf - Golangのエラー処理とpkg/errors | SOTA http://deeeet.com/writing/2016/04/25/go-pkg-errors/ - https://github.com/pkg/errors - https://github.com/creasty/apperrors - https://github.com/izumii5210/grpc-errors - https://github.com/izumin5210-sandbox/grp