Changes by: Aleksey Nogin (nogin at cs.caltech.edu)
Date: 1998-07-20 15:47:14 -0700 (Mon, 20 Jul 1998)
Revision: 2335
Log message:

      Use Failure instead of Invalid_argument
      

Changes	Path
+3 -3	metaprl/refiner/term_ds/term_subst_ds.mlp