Function WithMessage

errors.go:217–225

WithMessage annotates err with a new message. If err is nil, WithMessage returns nil.

(err error, message string)

// WithMessage annotates err with a new message.
// If err is nil, WithMessage returns nil.
func WithMessage(err error, message string) error {
	if err == nil {
		return nil
	}
	return &withMessage{
		cause: err,
		msg:   message,
	}
}

// WithMessagef annotates err with the format specifier.
// If err is nil, WithMessagef returns nil.