function foo(x) {
  if (!x) {
    console.warn('You must provide the x argument.');
  }
}

function bar(x) {
  return {
    stack: [
      {
        name: 'bar',
        fileName: 'Bar.js',
        lineNumber: 10,
        columnNumber: 5,
      }
    ],
    callback: foo.bind(null, x)
  };
}

function invokeCallback(continuation) {
  console.stack(continuation.stack);
  continuation.callback();
  console.endStack();
}

var continuation = bar(false);

invokeCallback(continuation);
// Logs:
// You must provide the x argument.
//    at foo (Example.js:3:4)
//    at bar (Bar.js:10:5)