set_encoding(extern, intern = nil) private

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# File lib/irb/init.rb, line 291
    def set_encoding(extern, intern = nil)
      verbose, $VERBOSE = $VERBOSE, nil
      Encoding.default_external = extern unless extern.nil? || extern.empty?
      Encoding.default_internal = intern unless intern.nil? || intern.empty?
      @CONF[:ENCODINGS] = IRB::DefaultEncodings.new(extern, intern)
      [$stdin, $stdout, $stderr].each do |io|
        io.set_encoding(extern, intern)
      end
      @CONF[:LC_MESSAGES].instance_variable_set(:@encoding, extern)
    ensure
      $VERBOSE = verbose
    end
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