asyncFunctions transformation does not work with generators: 'parse'

[UltCombo]

The asyncFunctions transformation does not work unless the generators transformation is applied.

Test case:

traceur.compile('async function f() { await p(); }', {
    generators: 'parse',
    asyncFunctions: true
});
'"use strict";\nasync function f() {\n  await p();\n}\n'

It would be nice to allow asyncFunctions to use vanilla ES6 generators when generators: 'parse', for usage in Node 0.11.13.

[UltCombo]

My initial idea was to transform async functions into a native generator wrapped in traceur.asyncWrap and then apply the generators transform, but that doesn't seem viable now as asyncWrap uses some internals from the generators transformation as well it seems.

At least, the asyncFunctions transform should be applied independent of the generators option.

[arv]

The async function transformer does not transform async functions into generators. We would need to write a new transformer to support that.

[UltCombo]

@arv Oh ok, never mind that bit for now. Can we get asyncFunctions: true to work with generators: false?

I don't quite see the reason why the async functions transformer stops working when generators are set to false/parse.

[arv]

Yes. async-functions should work with generators false. That is clearly a bug.