yes, the below line:
go func() { <-timeout }() // prevent leak
could also work, but it creates a separate go-routine which eventually will be finished depends on the timeout variable.
When the timeout variable was high then go-routine would exist during this timeout, which is not good for a performance. It is better to close a timer when we know that it is not longer required.

“`
timeout := time.After(time.Second)
select {
  case <-timeout:
// do something after 1 second.
  case <-ctx.Done():
go func() { <-timeout }() // prevent leak
// do something when context is finished.
  }
“`