before

evalmachine.<anonymous>:1
foo.bar = 5;
^
ReferenceError: foo is not defined
    at evalmachine.<anonymous>:1:1
    at ContextifyScript.Script.runInNewContext (vm.js:*)
    at Object.exports.runInNewContext (vm.js:*)
    at Object.<anonymous> (*test*message*undefined_reference_in_new_context.js:*)
    at Module._compile (module.js:*)
    at *..js (module.js:*)
    at Module.load (module.js:*)
    at Function.Module._load (module.js:*:*)
    at Function.Module.runMain (module.js:*:*)
    at startup (node.js:*:*)