# File lib/rspec/core/world.rb, line 10
      def initialize(configuration=RSpec.configuration)
        @configuration = configuration
        @example_groups = [].extend(Extensions::Ordered)
        @shared_example_groups = {}
        @filtered_examples = Hash.new { |hash,group|
          hash[group] = begin
            examples = group.examples.dup
            examples = filter_manager.prune(examples)
            examples.uniq
            examples.extend(Extensions::Ordered)
          end
        }
      end