Changes by: Aleksey Nogin (nogin at cs.caltech.edu)
Date: 2006-02-08 00:56:20 -0800 (Wed, 08 Feb 2006)
Revision: 8644
Log message:

      - Fixed a rewriter bug uncovered by a recent change to let_rule rule.
      - Fixed proofs that were broken by a variable naming change in let_rule.