package reference type notFoundError string func (e notFoundError) Error() string { return string(e) } func (notFoundError) NotFound() {} type invalidTagError string func (e invalidTagError) Error() string { return string(e) } func (invalidTagError) InvalidParameter() {} type conflictingTagError string func (e conflictingTagError) Error() string { return string(e) } func (conflictingTagError) Conflict() {}