XLISP bug

[ron at trsvax.UUCP]

The new posting of XLISP hangs forever when trying to load 'pt.lsp' on
a vax 780 under BSD 4.1.  In the routine 'gc', there is a "for" loop
that keeps going over and over the same nodes to mark and never exits. 
Interestingly enough, this problem does not show up if the program is
hand typed, just if loaded in from the file.

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