# File lib/rspec/core/backtrace_cleaner.rb, line 17
      def initialize(inclusion_patterns=nil, exclusion_patterns=DEFAULT_EXCLUSION_PATTERNS.dup)
        @exclusion_patterns = exclusion_patterns

        if inclusion_patterns.nil?
          @inclusion_patterns = (matches_an_exclusion_pattern? Dir.getwd) ? [Regexp.new(Dir.getwd)] : []
        else
          @inclusion_patterns = inclusion_patterns
        end
      end