python setup.py check --restructuredtext --strict --metadata fails for valid document with syntax highlighting

python setup.py check --restructuredtext --strict --metadata fails with:

warning: check: Could not finish the parsing.

if the RST document uses code or code-block directives.

This is annoying because the document is valid, but it appears to be invalid
and confuses people.
I filed a ticket for this (with a patch included):

https://sourceforge.net/p/docutils/bugs/270/

Marc

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