> Weird ... I was going to suggeest it was because you weren't flushing
> the output after each print statement.  

This raises important question:
Let's see the output as a sequence of bytes (there's no time).
Assuming that the process exits normally and incompatible printing 
functions are not mixed:
is there a guarantee (in OCaml library) that the flush operation doesn't 
affect the output?

For me it's obvious that the output shouldn't depend on the presence of 
flush operations. If otherwise - needs to be explicitly stated.

(Of course I'm not considering the one special flush action done when 
closing a stream, but it's tied to the closing function.)

Dawid