Changes by: Aleksey Nogin (nogin at cs.caltech.edu)
Date: 2004-02-25 00:54:40 -0800 (Wed, 25 Feb 2004)
Revision: 5409
Log message:
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* WARNING *
* This commit breaks .prla compatibility! *
* Export your proofs before updating!!! *
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Removing the unused ref_parent field from the tactic_arg (as well as related
fields from related data structures).