err != nil { fmt.Printf(": %+v¥n", errors.WithStack(err)) return } … } $ go run main.go : open abc.txt: no such file or directory main.main /Users/seto/go/src/github.com/andfactory/test/test_errors.go:13 runtime.main /usr/local/Cellar/go/1.11.2/libexec/src/runtime/proc.go:201 … HJUIVCDPNQLHFSSPST 8JUI4UBDL