mocktracer/mockspan.go
func (s *MockSpan) Logs() []MockLogRecord {
	s.RLock()
	defer s.RUnlock()
	logs := make([]MockLogRecord, len(s.logs))
	copy(logs, s.logs)
	return logs
}
func (s *MockSpan) Logs() []MockLogRecord {
	s.RLock()
	defer s.RUnlock()
	logs := make([]MockLogRecord, len(s.logs))
	copy(logs, s.logs)
	return logs
}
// Logs returns a copy of logs accumulated in the span so far