Changes by: Jason Hickey (jyh at cs.caltech.edu)
Date: 2006-03-17 14:51:03 -0800 (Fri, 17 Mar 2006)
Revision: 8927
Log message:

      Use "Attempt #2", which is equivalent to "Attempt #1", but
      safer, although somewhat more complicated when reflected.
      
      The Pmn_core_logic now at least passes the type checker.