64bit number strangeness

[DartBot]

This issue was originally filed by rsepul...@gmail.com

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What steps will reproduce the problem?

I am seeing some strange results when working with big numbers.. I am
running the following code...
 var hexDigits = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a",
                       "b", "c", "d", "e", "f"];
num myNum = 0x123456789ABCDEF0; // long long (64 bit value) 8 bytes
String str = "";
num cnum = myNum;
for( var i=0; i<16; ++i){
   var ndx = cnum & 0x0f;
   str = hexDigits[ndx] + str;
   cnum = (cnum >> 4);
}
document.query("#message").innerHTML = "Next ${myNum.toRadixString(16)} Pressed2 ${str}";

What is the expected output? What do you see instead?

Expected: Next 123456789abcdef0 Pressed2 123456789abcdef0

Actually see: Next 123456789abcdf00 Pressed2 ffffffff9abcdf00

What version of the product are you using? On what operating system?

Latest version of Dart Editor

Please provide any additional information below.

Please see this thread for additional info
https://groups.google.com/a/dartlang.org/group/misc/browse_thread/thread/f9c1675eda40462f#

[DartBot]

This comment was originally written by drfibonacci@google.com

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Added Area-Compiler, Triaged labels.

[DartBot]

This comment was originally written by zundel@google.com

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no code generation in dartc anymore.

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Added WontFix label.