Support use of autodoc with myst

Edit:

The implementation of eval-rst has now been closed (see this documentation section)

However, a new issue has also been opened, specifically for using Markdown in docstrings: #228

---

I can’t figure out how to use autodoc with myst.

With recommonmark, I have something like

```eval_rst
.. autofunction:: functionname
```

or

```eval_rst
.. autoclass:: classname
   :members:
```

Based on on the myst docs. I can’t figure out what to use to make it work in myst.

(by the way, the example at https://myst-parser.readthedocs.io/en/latest/using/syntax.html#extended-block-tokens, doesn’t seem to agree with the example at https://myst-parser.readthedocs.io/en/latest/using/syntax.html#syntax-directives).

After many attempts at the syntax, I finally got something that at least produced some output. But all it seems to do is inline raw rst instead of rendering it.

[sbliven]

Yeah, eval_rst seems like a good start, and will probably be handy for other situations in the future. It seems like we are quite far from my dream of markdown docstrings.

[chrisjsewell]

Closed in v0.12.2 😄 See https://myst-parser.readthedocs.io/en/latest/using/howto.html#use-sphinx-ext-autodoc-in-markdown-files