resolve_class

# File ext/psych/lib/psych/visitors/to_ruby.rb, line 262
      def resolve_class klassname
        return nil unless klassname and not klassname.empty?

        name    = klassname
        retried = false

        begin
          path2class(name)
        rescue ArgumentError, NameError => ex
          unless retried
            name    = "Struct::#{name}"
            retried = ex
            retry
          end
          raise retried
        end
      end