diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug623859.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug623859.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// |jit-test| allow-oom
+var size = 1000000;
+var a = [];
+for (var i = 0; i < size; ++i) {
+    a[i] = null;
+}
+gcparam("maxBytes", gcparam("gcBytes") + 4*1024);
+for (var i = 0; i < size; ++i) {
+    a[i] = [];
+}