Invalid parsing of indirect hyperlink targets in reStructuredText

[roxeteer]

This reStructuredText sample produces invalid HTML code in Pandoc:

`click here`__ or `click here`__

.. _link1: http://www.example.com/
.. _link2: http://johnmacfarlane.net/pandoc/

__ link1_
__ link2_

It currently generates this HTML:

<p><a href="link1_">click here</a> or <a href="link2_">click here</a></p>

But it should generate this HTML:

<p><a href=http://www.example.com/">click here</a> or <a href="http://johnmacfarlane.net/pandoc/">click here</a></p>

[mpickering]

This is still an issue with 1.13.1. I suspect that hyperlink targets are not implemented fully.