class RSpec::Core::ConfigurationOptions

def parse_options
  @options = begin
               options_to_merge = []
               if custom_options_file
                 options_to_merge << custom_options
               else
                 options_to_merge << global_options
                 options_to_merge << local_options
               end
               options_to_merge << command_line_options
               options_to_merge << env_options
               options_to_merge.inject do |merged, options|
                 merged.merge(options)
               end
             end
end