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/usr/lib/ruby/vendor_ruby/highline/compatibility.rb is in ruby-highline 1.6.20-1.

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unless STDIN.respond_to? :getbyte
  class IO
    alias_method :getbyte, :getc
  end

  class StringIO
    alias_method :getbyte, :getc
  end
end

unless "".respond_to? :each_line
  # Not a perfect translation, but sufficient for our needs.
  class String
    alias_method :each_line, :each
  end
end