Changes by: Jason J. Hickey (jyh at cs.caltech.edu)
Date: 2007-11-04 11:13:01 -0800 (Sun, 04 Nov 2007)
Revision: 12556
Log message:

      Unquote always evaluates, no matter how deeply nested.
     
        Y = 3
        X = $`(add 1, $`(add 2, $,Y))
        Y = 4
        println($X)
     
     evaluates to 6