How to get caller from strict mode?

Strict and non-strict code can be mixed. But you can't use caller even if the call to it is not in strict code. Does anybody know any workaround?

I tried this:

(function strict(){
    "use strict";
    nonStrict();//ok
    nonStrictCaller();//error :(
})();

function nonStrict(){
    return 011;//Octal literals are not allowed in strict mode
}

function nonStrictCaller(){
    return nonStrictCaller.caller;
}