diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug659779.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug659779.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+// Binary: cache/js-dbg-64-8bcb569c9bf9-linux
+// Flags: -m -n -a
+//
+
+var gTestcases = new Array;
+function TestCase(n, d, e, a) {
+  this.description=d
+  gTestcases[gTc++]=this
+}
+TestCase.prototype.dump=function () + toPrinted(this.description)
+function toPrinted(value) value=value;
+function reportCompare (expected, actual, description) {
+  new TestCase("unknown-test-name", description, expected, actual)
+}
+function enterFunc (funcName) {
+  try {
+    expectCompile = 'No Error'
+    var actualCompile;
+    reportCompare(expectCompile, actualCompile, ': compile actual')
+  } catch(ex) {}
+}
+gTc=0;
+function jsTestDriverEnd() {
+  for (var i = 0; i < gTestcases.length; i++) gTestcases[i].dump()
+}
+enterFunc();
+reportCompare(0, 0, 5.123456);
+reportCompare(0, 0, this );
+jsTestDriverEnd();
+try {
+  this.__proto__=[]
+} catch(ex) {}
+jsTestDriverEnd()