How can I detect I'm inside an eval() call?

Does there exist a string s such that

(new Function(s))();

and

eval(s);

behave differently? I'm trying to "detect" how a string is being evaluated.

Check for the arguments object. If it exists, you're in the function. If it doesn't it has been evaled.

Note that you'll have to put the check for arguments in a try...catch block like this:

var s = 'try {document.writeln(arguments ? "Function" : "Eval") } catch(e) { document.writeln("Eval!") }';
(new Function(s))();
eval(s);

Demo

Solution to nnnnnn's concern. For this, I've edited the eval function itself:

var _eval = eval;
eval = function (){
    // Your custom code here, for when it's eval
    _eval.apply(this, arguments);
};

function test(x){
    eval("try{ alert(arguments[0]) } catch(e){ alert('Eval detected!'); }");
}
test("In eval, but it wasn't detected");​