code: def do_examine(self, arg):
          
          #We use their default editor (if it has been set); otherwise we can't do much of
          #anything and issue a warning.
          from os import getenv, path, system
          testcase, output = arg.split()
          target = path.join(self.tests[self.active].stagedir, "tests", testcase, 
                             "{}.compare".format(output))
          if getenv("EDITOR") is not None:
              system("`$EDITOR {}`".format(target))
          else:
              msg.warn("$EDITOR not set in environment. Can't open {}".format(target))
docs: Opens a unit test case's .out.compare file to examine the verbose comparison
          report across values.