sum: Rework some error handling #7605
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Update sum to properly propagate errors from file-reads, including implementing a retry on ErrorKind::Interrupted. Also switch to using writeln! rather than println! to prevent crashes if stdout is directed to /dev/full
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Update sum to properly propagate errors from file-reads, including implementing a retry on ErrorKind::Interrupted. Also switch to using writeln! rather than println! to prevent crashes if stdout is directed to /dev/full