To run the parser and pretty printer, do the following:

1) edit the "sources.cm" file and set the path to ml-yacc

2) start SML

3) at the prompt, type ``CM.make();'' to run the compilation manager

4) at the prompt, type: ``test "program.imp";'' to parse and print the
   sample program from file "program.imp". This test harness will also
   attempt to run the program using the function eval that you will
   write, in the file eval.sml.

5) type Ctrl-D to exit SML.