Bug: Unbound variable:

[Linas Vepstas]

Hi,

In guile-1.8.5 (haven't yet tried 1.8.6) I'm seeing a strange bug:
a program that has been running a while (12-24 hours) and
approaching an out-of-memory condition (system on verge
of swapping to disk) will suddenly get an 'Unbound variable'
error on a variable that is heavily in use (dozens or maybe
thousands of calls per second).  This system has only *one*
thread in guile mode.

Anyone seen anything like that before? Any suggestions
for how to debug?

--linas

p.s. yes, am trying 1.8.6 shortly.