False unhandled rejection

[Dashron]

Creating issue for future reference. In certain versions of iojs the following code throws an unhandled rejection error

"use strict";

process.on('unhandledRejection', function(reason, p) {
    console.log("\nUnhandled Rejection at:\n Promise ", p, "\n reason: ", reason);
    throw reason;
});

var coroutine = require('./index.js');

var first = coroutine(function* () {
    yield new Promise(function (resolve, reject) {
        resolve(null);
    });

    return new Promise(function (resolve, reject) {
        reject(new Error('Unauthorized'));
    });
});

first()
.then(function (response) {
    console.log('resp', response);
}, function (err) {
    console.log('err', err);
});

[Dashron]

Updating to 2.5.0 fixed the problem for me