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        # IOError < StandardError

(from ruby core)
Raised when an IO operation fails."/etc/hosts") {|f| f << "example"}
      #=> IOError: not opened for writing"/etc/hosts") {|f| f.close; }
      #=> IOError: closed stream

Note that some IO failures raise `SystemCallError`s and these are not
subclasses of IOError:"does/not/exist")
      #=> Errno::ENOENT: No such file or directory - does/not/exist


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