[plt-scheme] interleaving the I and O in I/O

[Prabhakar Ragde]

Matthew Flatt wrote:

> There's currently no way to control that.
> 
> To avoid the flush, you could write a different port that has its own
> buffer and that eventually flushes to the original output port --- but
> the wrapper creates enough new work that it might defeat the purpose.
> 
> FWIW, I did change v4 so that the port has to be a tty to trigger
> auto-flush.

Thanks. In this case I will not worry about it for now, because the 
undesired behaviour will go away soon. --PR