The spec says unary + is only allowed with integer and floating point literals, not with hex literals. Somebody noticed that the VM accepted
+0x10 as well.
Consequently, the Math.parseInt(str) library function should fail with
a BadNumberFormatException if it is called with a hex number that is preceded by a +.
Fixes issue 1540.
This change exposed that the dart2js core library implementation is
falsely accepting +0xNNN hex numbers. I filed issue 3333.
Review URL: https://chromiumcodereview.appspot.com//10456060
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@8177 260f80e4-7a28-3924-810f-c04153c831b5
kasperl@google.com