diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug854137.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug854137.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+// Don't assert.
+try {
+    eval("function x(y = {\
+        x: (7) ? 0 : yield(0)\
+    }");
+} catch (e) {}