ioerror error

An exception other than end-of-file has occurred during execution of one of the file operators. The nature of the exception is environment dependent, but may include such events as parity or checksum errors, or broken network connections.
Attempting to write to an input file or to a file that has been closed will also cause an ioerror. Occurrence of an ioerror does not cause the file to become closed unless it was already closed or the error occurs during closefile.


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