C:\Projects\JsonParser\JsonParser\Parser.n(16,4):Error: non local goto (block return?) detected (l3174)

Peg:       3021355688
newton:    4288512896

      test = <#{ 
  a : 1, 
  b : "2",
  c : true,
  d : [null, '2', true,],
  "e" : { "a" : 1, b : '2', c : 3.14},
  f : null,
}
#>;

    [Test]
    public NewtonJsonBechmark() : void
    {
      def parser = Parser();
      def count = 100000;

      _ = parser.Parse(test);
      _ = JObject.Parse(test);
      
      def sw = Stopwatch();
      sw.Start();
      for (mutable i = 0; i < count; i++)
        _ = parser.Parse(test);
      sw.Stop();
      Console.WriteLine("Peg:\t{0}", sw.ElapsedTicks);
      
      def sw = Stopwatch();
      sw.Start();
      for (mutable i = 0; i < count; i++)
        _ = JObject.Parse(test);
      sw.Stop();
      Console.WriteLine("newton:\t{0}", sw.ElapsedTicks);
    }
  }

Peg:    3019991768
newton:    4519395488

set MSBuild="%SystemRoot%\Microsoft.NET\Framework\v3.5\msbuild.exe"
set NoPause=true
%MSBuild% NemerleAll.nproj /target:DevBuildQuickNccOnly /p:Configuration=Release /verbosity:n /p:NTargetName=Build
rem /verbosity:n /p:TargetName=Build
IF %errorlevel% == 0 call Reg-bins-2.cmd
pause

Z>C:\Projects\JsonParser\JsonParser\Parser.n(16,4):Error: non local goto (block return?) detected (l3174)
Z>

  a : char = 'a';
  b : char = 'b';
  c : char = 'c';
  abc : char (a / b/ c);