    # File lib/compass/installers/manifest.rb, line 143
          def parse(manifest_file)
            with_manifest(manifest_file) do
              if File.exists?(manifest_file)
                open(manifest_file) do |f|
                  eval(f.read, instance_binding, manifest_file)
                end
              else
                  eval("discover :all", instance_binding, manifest_file)
              end
            end
          end