paulson [Thu, 24 Aug 2000 11:14:21 +0200] rev 9684
fixed strip_assums and assum_pairs, restoring them (essentially) to their
1989 versions. They had been "optimized" for flattened parameters, but
failed when given an initial, non-flattened proof state. A manifestation
of the bug is
Goal "of the bug isf. EX B. Q(f,B) ==> (of the bug isy. P(f,y))";
be exE 1;