ulong math is incorrect

[ghent360]

Sample code, entered in try.jsil.com

using System;
public static class Program {
public static void Main () {
ulong x64 = 2 << 47;
ulong y64 = x64 << 5;
Console.WriteLine("Hello JSIL World!");
Console.WriteLine("{0}, {1}", x64, y64);
}
}

Generated code:
...
(function Program$Members () {
var $, $thisType;
var $T00 = function () {
return ($T00 = JSIL.Memoize($asm01.System.Console)) ();
};
var $T01 = function () {
return ($T01 = JSIL.Memoize($asm01.System.UInt64)) ();
};

function Program_Main () {
$T00().WriteLine("Hello JSIL World!");
$T00().WriteLine(
"{0}, {1}",
$T01().Create(65536, 0, 0),
$T01().op_LeftShift($T01().Create(65536, 0, 0), 5)
);
};

JSIL.MakeStaticClass("Program", true, [], function ($interfaceBuilder) {
$ = $interfaceBuilder;

$.Method({Static:true , Public:true }, "Main", 
  JSIL.MethodSignature.Void, 
  Program_Main
);

return function (newThisType) { $thisType = newThisType; }; 

});

})();

Output:
Hello JSIL World!
65536, 2097152

Expected:
Hello JSIL World!
140737488355328, 4503599627370496

[Markus Johnsson]

Your example program produces the same output on JSIL and .NET 4.5 (try for example dotnetfiddle.net). Where did you run it to get the expected output?

[ghent360]

Sorry, my mistake. Should have been 1L << 47;
It works fine when I fix the code.