https://hg.openjdk.java.net/jdk/jdk/rev/95e8aba3b047

Adds usage printing when parameter parsing is broken. However, it doesn't account for the valid "all" suboption.

                  liveopt = "-live";
              } else if (subopt.startsWith("file=")) {
                  filename = parseFileName(subopt);
 + } else if (subopt.equals("format=b")) {
 + // ignore format (not needed at this time)
 + } else {
 + System.err.println("Fail: invalid option: '" + subopt + "'");
 + usage(1);
              }
          }