gistfile1.js

function foo() {
	return Function.bind(null,"return bar;");
}

var bar = 1;

(function(){
	var bar = 2;
	console.log( foo()()() ); // 1 -- but wanted 2 :(
})();

gistfile2.js

function foo() {
	return eval.bind(null,"(function(){ return bar; })");
}

var bar = 1;

(function(){
	var bar = 2;
	console.log( foo()()() ); // 1 -- but wanted 2 :(
})();

gistfile3.js

function foo() {
	return "(function(){ return bar; })";
}

var bar = 1;

(function(){
	var bar = 2;
	console.log( eval( foo() )() ); // 2! but inline eval :(
})();