# File lib/treetop/compiler/metagrammar.rb, line 310
      def _nt_module_declaration
        start_index = index
        if node_cache[:module_declaration].has_key?(index)
          cached = node_cache[:module_declaration][index]
          if cached
            node_cache[:module_declaration][index] = cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
            @index = cached.interval.end
          end
          return cached
        end

        i0, s0 = index, []
        i1, s1 = index, []
        i2 = index
        if (match_len = has_terminal?('module', false, index))
          r3 = instantiate_node(SyntaxNode,input, index...(index + match_len))
          @index += match_len
        else
          terminal_parse_failure('\'module\'')
          r3 = nil
        end
        if r3
          r3 = SyntaxNode.new(input, (index-1)...index) if r3 == true
          r2 = r3
        else
          if (match_len = has_terminal?('class', false, index))
            r4 = instantiate_node(SyntaxNode,input, index...(index + match_len))
            @index += match_len
          else
            terminal_parse_failure('\'class\'')
            r4 = nil
          end
          if r4
            r4 = SyntaxNode.new(input, (index-1)...index) if r4 == true
            r2 = r4
          else
            @index = i2
            r2 = nil
          end
        end
        s1 << r2
        if r2
          r5 = _nt_space
          s1 << r5
          if r5
            i6, s6 = index, []
            if has_terminal?(@regexps[gr = '\A[A-Z]'] ||= Regexp.new(gr), :regexp, index)
              r7 = true
              @index += 1
            else
              terminal_parse_failure('[A-Z]')
              r7 = nil
            end
            s6 << r7
            if r7
              s8, i8 = [], index
              loop do
                r9 = _nt_alphanumeric_char
                if r9
                  s8 << r9
                else
                  break
                end
              end
              r8 = instantiate_node(SyntaxNode,input, i8...index, s8)
              s6 << r8
              if r8
                s10, i10 = [], index
                loop do
                  i11, s11 = index, []
                  if (match_len = has_terminal?('::', false, index))
                    r12 = instantiate_node(SyntaxNode,input, index...(index + match_len))
                    @index += match_len
                  else
                    terminal_parse_failure('\'::\'')
                    r12 = nil
                  end
                  s11 << r12
                  if r12
                    if has_terminal?(@regexps[gr = '\A[A-Z]'] ||= Regexp.new(gr), :regexp, index)
                      r13 = true
                      @index += 1
                    else
                      terminal_parse_failure('[A-Z]')
                      r13 = nil
                    end
                    s11 << r13
                    if r13
                      s14, i14 = [], index
                      loop do
                        r15 = _nt_alphanumeric_char
                        if r15
                          s14 << r15
                        else
                          break
                        end
                      end
                      r14 = instantiate_node(SyntaxNode,input, i14...index, s14)
                      s11 << r14
                    end
                  end
                  if s11.last
                    r11 = instantiate_node(SyntaxNode,input, i11...index, s11)
                    r11.extend(ModuleDeclaration0)
                  else
                    @index = i11
                    r11 = nil
                  end
                  if r11
                    s10 << r11
                  else
                    break
                  end
                end
                r10 = instantiate_node(SyntaxNode,input, i10...index, s10)
                s6 << r10
              end
            end
            if s6.last
              r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
              r6.extend(ModuleDeclaration1)
            else
              @index = i6
              r6 = nil
            end
            s1 << r6
            if r6
              r16 = _nt_space
              s1 << r16
            end
          end
        end
        if s1.last
          r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
          r1.extend(ModuleDeclaration2)
        else
          @index = i1
          r1 = nil
        end
        s0 << r1
        if r1
          i17 = index
          r18 = _nt_module_declaration
          if r18
            r18 = SyntaxNode.new(input, (index-1)...index) if r18 == true
            r17 = r18
          else
            r19 = _nt_grammar
            if r19
              r19 = SyntaxNode.new(input, (index-1)...index) if r19 == true
              r17 = r19
            else
              @index = i17
              r17 = nil
            end
          end
          s0 << r17
          if r17
            i20, s20 = index, []
            r21 = _nt_space
            s20 << r21
            if r21
              if (match_len = has_terminal?('end', false, index))
                r22 = instantiate_node(SyntaxNode,input, index...(index + match_len))
                @index += match_len
              else
                terminal_parse_failure('\'end\'')
                r22 = nil
              end
              s20 << r22
            end
            if s20.last
              r20 = instantiate_node(SyntaxNode,input, i20...index, s20)
              r20.extend(ModuleDeclaration3)
            else
              @index = i20
              r20 = nil
            end
            s0 << r20
          end
        end
        if s0.last
          r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
          r0.extend(ModuleDeclaration4)
          r0.extend(ModuleDeclaration5)
        else
          @index = i0
          r0 = nil
        end

        node_cache[:module_declaration][start_index] = r0

        r0
      end