Create an errors listener to reject the promise. (#1203)

lib/index.js

@@ -673,8 +673,8 @@ class Generator extends EventEmitter {
  // Ensure we emit the error event outside the promise context so it won't be
  // swallowed when there's no listeners.
  setImmediate(() => {
- self.emit('error', err);
  reject(err);
+ self.emit('error', err);
  });
  });
  },
@@ -703,6 +703,9 @@ class Generator extends EventEmitter {
  this.debug('Generator is starting');
  this.emit('run');
 
+ // Add an error listener to reject the promise
+ this.on('error', reject);
+
  const methods = Object.getOwnPropertyNames(Object.getPrototypeOf(this));
  const validMethods = methods.filter(methodIsValid);
  if (!validMethods.length) {
@@ -726,7 +729,7 @@ class Generator extends EventEmitter {
  const item = property.value ? property.value : property.get.call(self);
 
  const priority = self._queues[name];
- let taskOptions = { ...priority, reject };
+ let taskOptions = { ...priority };
 
  // Name points to a function; run it!
  if (typeof item === 'function') {