diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug790921.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug790921.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+// |jit-test| slow;
+// Binary: cache/js-dbg-64-fdfaef738a00-linux
+// Flags: --ion-eager
+//
+
+evaluate("\
+gcparam(\"maxBytes\", gcparam(\"gcBytes\") + 4 );\n\
+test();\n\
+function test() {\n\
+  function flatten(arr)\n\
+  actual = flatten([1, [2], 3]);\
+}\n\
+");
+try {} catch (lfVare) {}