class RSpec::Core::Formatters::DeprecationFormatter

def printer
  @printer ||= case deprecation_stream
               when File
                 ImmediatePrinter.new(FileStream.new(deprecation_stream),
                                      summary_stream, self)
               when RaiseErrorStream
                 ImmediatePrinter.new(deprecation_stream, summary_stream, self)
               else
                 DelayedPrinter.new(deprecation_stream, summary_stream, self)
               end
end