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error(msg : string)

Print a usage message incorporating 'msg' to stderr and exit.
If you override this in a subclass, it should not return -- it
should either exit or raise an exception.

src/p/y/pycmd-1.0/pycmd/pyconvert_unittest.py   pycmd(Download)
    if output in ['inplace', 'copy'] and not args:
                '-i and -c option  require at least one filename')
    if not args: