Yield and uncaught exception in coroutine

excetion in coroutine

var Promise = require('bluebird');

// log the error
Promise.onPossiblyUnhandledRejection(function(error){
  // this will be called even though there is a catch
  console.log('uncaught error here');
  console.log(error);
});

var toCall = Promise.coroutine(function* () {
  console.log('going to explode');
  throw new Error('boom');
});

Promise.spawn(function* () {
  try {
    console.log('calling the function here');
    var val = yield toCall();
  } catch(e) {
    console.log('got an error');
  }
});