[racket] fun with ports and (system ..) calls

From: Vlad Kozin (vladilen.kozin at gmail.com)
Date: Wed Oct 16 15:03:19 EDT 2013

> When you use `(for/list ((line (in-lines in))) ...)` the `in-lines`
> sequence doesn't end until an EOF is available --- but a line can be
> received anyway, as long as newline is found to terminate the line.

Damn, I'm accumulating here! Subtle but I think I get it now! Sensible behavior but I bet this won't be the last time I trip over it. 


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