Struct errFmt

fmttests/format_error_test.go:542–542

errFmt has both Format() and FormatError(), and demonstrates the common case of "rich" errors.

// errFmt has both Format() and FormatError(),
// and demonstrates the common case of "rich" errors.
type errFmt struct{ msg string }

func (e *errFmt) Error() string                 { return e.msg }
func (e *errFmt) Format(s fmt.State, verb rune) { errbase.FormatError(e, s, verb) }