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/usr/lib/ruby/vendor_ruby/em-synchrony/core_ext.rb is in ruby-em-synchrony 1.0.5-2ubuntu1.

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module Kernel
  if !self.methods.include?(:silence_warnings)
    def silence_warnings
      old_verbose, $VERBOSE = $VERBOSE, nil
      yield
    ensure
      $VERBOSE = old_verbose
    end
  end
end