unexpected strict mode reserved word -- yield? Node v0.11, harmony, es6 - node.js

Question

Trying to use a new ES6 based node.js ODM for Mongo (Robe http://hiddentao.github.io/robe/)
Getting "unexpected strict mode reserved word" error. Am I dong something wrong here?
test0.js
"use strict";
// Random ES6 (works)
{ let a = 'I am declared inside an anonymous block'; }
var Robe = require('robe');
// :(
var db1 = yield Robe.connect('127.0.0.1');
Run it:
C:\TestWS>node --version
v0.11.10
C:\TestWS>node --harmony test0.js
C:\TestWS\test0.js:12
var db1 = yield Robe.connect('127.0.0.1');
^^^^^
SyntaxError: Unexpected strict mode reserved word
at exports.runInThisContext (vm.js:69:16)
at Module._compile (module.js:432:25)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:349:32)
at Function.Module._load (module.js:305:12)
at Function.Module.runMain (module.js:490:10)
at startup (node.js:123:16)
at node.js:1031:3

Answer 1

If you want to use generators to do asynchronous operation in synchronous fashion you must do it like:
co(function*() {
"use strict";
{ let a = 'I am declared inside an anonymous block'; }
var Robe = require('robe');
var db1 = yield Robe.connect('127.0.0.1');
})();
where co realization you can find in:
co
Task.js
bluebird's Promise.coroutine
q's spawn
and so on.
In strict mode you cannot use yield outside of the generators. In non-strict mode outside of the generators yield will be considered as variable identifier - so in your case it'll throw an error anyway.

Answer 2

Also noteworthy... new versions of co return/use promises rather than thunks. So this is what worked with newer versions of co.
var co = require('co');
co(function*() {
"use strict";
{ let a = 'I am declared inside an anonymous block'; }
var Robe = require('robe');
var db1 = yield Robe.connect('127.0.0.1/swot');
console.log(db1)
return db1;
}).then(function (value) {
console.log(value);
}, function (err) {
console.error(err.stack);
});