diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/function-tosource-genexpr.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/function-tosource-genexpr.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+function getgen() {
+    gen = getgen.caller;
+}
+var gen;
+(getgen() for (x of [1])).next();
+assertEq(gen.toSource(), "function genexp() {\n    [generator expression]\n}");
+assertEq(decompileBody(gen), "\n    [generator expression]\n");