shohi opened a new issue #296:
URL: https://github.com/apache/pulsar-client-go/issues/296
From the source code, no callback or returned error is found.
```go
type Consumer interface {
// Ack the consumption of a single message
Ack(Message)
// Acknowledge the failure to process a single message.
//
// When a message is "negatively acked" it will be marked for
redelivery after
// some fixed delay. The delay is configurable when constructing the
consumer
// with ConsumerOptions.NAckRedeliveryDelay .
//
// This call is not blocking.
Nack(Message)
// ...
}
```
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