Example of broken promisifying of seneca.act from within a plugin

seneca_plugin_promise_act.js

"use strict";
const Promise = require('bluebird');
require('seneca')()
  .use(function testPlugin(options) {
    const seneca = this;
    const act = Promise.promisify(seneca.act, seneca);

    seneca.add("cmd:test", (args, done) => {
      act("cmd:log", {msg: "hello world"})
        .then(r => done(null, r))
        .catch(e => done(e))
    });
  })
  .add("cmd:log", (args, done) => {
    console.log(args.msg);
    done();
  })
  .act("cmd:test");