Preventing automatic link generation with ! fails with pypy interepreter

[CendioMartin]

As per @ThomasWaldmann suggestion in #91, running with pypy instead of CPython is way forward until Moin2 is stable.

I stumbled upon a problem with negating automatic link generation. Prepending !CamelCase should produce
CamelCase
but does not. It's successful in not tuning it to a link, but it ouputs as
!CamelCase

It's easy enough to reproduce:
Download the latest release of pypy2:
curl -O https://downloads.python.org/pypy/pypy2.7-v7.3.9-linux64.tar.bz2

Clone moin repo
git clone https://github.com/moinwiki/moin-1.9

Start Desktop Edition of moinmoin
/path/to/pypy wikiserver.py

Point your browser to the wiki and create a page with a link and watch the output.
(I had to edit wikiserverconfig.py and insert DesktopEdition = True to be able to edit/create pages)

Press Ctrl+C to stop the wikiserver.py and start it with CPython:
python wikiserver.py

Refresh that same page and you should see it output as expected.

[ThomasWaldmann]

did you try cleaning the cache when switching interpreters?

moin ... maint cleancache

or just kill the cache subdir of the respective page directory inside the data_dir?

[CendioMartin]

Yes, I've tried those steps at some point in my journey to troubleshoot this issue in our production wiki.
This is reproducable with a new install/DesktopEdition (as per my steps outlined above) as well.