Object.defineProperty(Creep.prototype, 'run', {
  value: function() {
    if (this.nextRun > Game.time || !this.task) return OK;

    try {
      let task = require('class.task.' + this.task);
      return task.run(this);
    }
    catch (e) {
      // unknown module/task
      logger.error(`Invalid task "${this.task}" for creep ${this.name}`);
      return ERR_INVALID_ARGS;
    }
  },
  configurable: true,
  enumerable: false,
});