package errhttp import ( "errors" ) var ErrLocked error = LockedWrap(errors.New("Locked")) type Locked interface { ClientError Locked() } type internalLocked struct { err error } func LockedWrap(err error) error { return internalLocked{ err:err, } } func (receiver internalLocked) Error() string { return receiver.err.Error() } func (receiver internalLocked) Err() error { return receiver.err } func (internalLocked) ClientError() { // Nothing here. } func (internalLocked) Locked() { // Nothing here. } func (receiver internalLocked) Unwrap() error { return receiver.err }