src/third_party/mozjs-45/js/src/jit-test/tests/basic/testThatGenExpsActuallyDecompile.js

// |jit-test| error: 3
var str = (function (x) {return (i for (i in x));}).toSource().replace('\n', '');
assertEq(str, "(function (x) {return (i for (i in x));})");
throw 3;