var Promise = require('rsvp').Promise;

function MyCoolErr() {}

function foo() {
  return new Promise(function(resolve, reject) {
    console.log("We're running...");

    // Resolve and all is good ...
    resolve();
  });
}

foo()
  .then(function() {
    console.log("We're still running...");
    
    // But then we go and throw ANY exception in here
    // and the error is silently swallowed.
    throw 'any runtime err, incl. typos, invalid code etc.'
    
    console.log("We won't get here.");
  })
	.catch(function(err) {
    if (err instanceof MyCoolErr) {
      console.log('I know this error so will handle here');
      return;
    }
    
    console.log('I did not recognise the error ...');
    
    // And I re-threw it. I expect this to be an 'unhandled exception' and reach my devtools.
    //
    // ... But nope, I'll never know this happened :(
    throw err;
	});