after 4d4900f, stack trace was changed.
4d4900f
@ -10,5 +10,5 @@ ReferenceError: foo is not defined
at Object..js (module.js:*)
at Module.load (module.js:*)
at Function._load (module.js:*)
at Array.<anonymous> (module.js:*)
at Array.0 (module.js:*)
at EventEmitter._tickCallback (node.js:*)