Hi Matt,
My guess is that because you don't close the output port before waiting
for results, dot(1) sits there waiting for more input and your procedure
appears to hang.
I'd try closing `oup` once you've written your graph to the process, for
example by making the thunk you use for the "dot writer" thread look like:
(lambda ()
(with-output-to-port oup
(lambda ()
(map print indat)
(close-output-port oup))))
Cheers,
Evan
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