Strange out-of-memory

vows-oom.js

var vows = require('vows');
var assert = require('assert');
var https = require('https');

vows.describe("dies?").addBatch({
  "pretend this is doing several https requests": {
    topic: function() {
      var cb = this.callback;
      // https is important; http doesn't produce an error
      var req = https.request({host:'encrypted.google.com',path:'/',method:'GET'}, function(res) {
        res.on('end', function() { cb(null,[res]) });
      });
      req.on('error',cb);
      req.end();
    },
    "got two responses": function(responses) {
      assert.lengthOf(responses, 2); // <-- "FATAL ERROR: JS Allocation failed - process out of memory"
    },
  }
}).export(module);