> After making a few minor changes, my program started raising the 
> Out_of_memory exception.  The strange thing is it fires a split 
> second after the program starts.  It happens so fast, 'top' doesn't 
> even have a chance to register it on its radar.
> I narrowed it down to a 'Hashtbl.find' application.

This is very likely due to a structural comparison (via =, like
Hashtbl.find does) between cyclic structures.  Structural comparison
maintains a recursion stack that is bounded, and raises Out_of_memory
when that stack overflows.  With 3.08, you can confirm this hypothesis
by running with OCAMLRUNPARAM set to 'v=63'; structural comparison
will print a message if it runs out of recursion stack.

- Xavier Leroy

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