In the event of an erroneous or unmatched argument, the method prints a message and exits the program with code 1.
If help options are enabled and one of the arguments matches a help option, then the result of {@link #getHelpMessage getHelpMessage} is printed to the default print stream and theprogram exits with code 0. If help options are not enabled, they are ignored. @param args argument list @see ArgParser#getDefaultPrintStream
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