# File lib/treetop/compiler/metagrammar.rb, line 2989
      def _nt_predicate_block
        start_index = index
        if node_cache[:predicate_block].has_key?(index)
          cached = node_cache[:predicate_block][index]
          if cached
            cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
            @index = cached.interval.end
          end
          return cached
        end

        i0, s0 = index, []
        if has_terminal?('', false, index)
          r1 = instantiate_node(SyntaxNode,input, index...(index + 0))
          @index += 0
        else
          terminal_parse_failure('')
          r1 = nil
        end
        s0 << r1
        if r1
          r2 = _nt_inline_module
          s0 << r2
        end
        if s0.last
          r0 = instantiate_node(PredicateBlock,input, i0...index, s0)
          r0.extend(PredicateBlock0)
        else
          @index = i0
          r0 = nil
        end

        node_cache[:predicate_block][start_index] = r0

        r0
      end