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there is a bug in xscheme0.17's (restore) function. the bug is that garbage
collection should be inhibited during the main part of xlirestore(). This
is because the image is restored in node-array order, rather than obarray order.
For example, strings may be restored before the symbols which refer to them,
and a gc before the corresponding symbol is restored will remove the string (set
its type to FREE). routines called in xlirestore (e.g. getvspace()) can
A fix is simply to set a flag inhibiting gc during the main part of
xlirestore. dbetz confirmed that this is a reasonable fix.