test-check-py3-compat: exclude thirdparty and cffi which are known to fail
Otherwise the following errors would be spilled out:
mercurial/cffi/bdiff.py: error importing: <ImportError> cannot import
name '_bdiff' (error at bdiff.py:*)
mercurial/cffi/bdiffbuild.py: error importing: <ModuleNotFoundError> No
module named 'cffi' (error at bdiffbuild.py:*)
mercurial/cffi/mpatch.py: error importing: <ImportError> cannot import
name '_mpatch' (error at mpatch.py:*)
mercurial/cffi/mpatchbuild.py: error importing: <ModuleNotFoundError> No
module named 'cffi' (error at mpatchbuild.py:*)
mercurial/cffi/osutilbuild.py: error importing: <ModuleNotFoundError> No
module named 'cffi' (error at osutilbuild.py:*)
mercurial/thirdparty/concurrent/futures/_base.py: invalid syntax: invalid
syntax (<unknown>, line *)
mercurial/thirdparty/concurrent/futures/process.py: error importing:
<SyntaxError> invalid syntax (_base.py, line 416) (error at __init__.py:*)
mercurial/thirdparty/concurrent/futures/thread.py: error importing:
<SyntaxError> invalid syntax (_base.py, line 416) (error at __init__.py:*)
mercurial/thirdparty/zope/interface/_flatten.py: error importing:
<ImportError> cannot import name 'Declaration' (error at _flatten.py:*)
Some of them can be suppressed by building cffi modules for example, but
I don't think it's worth keeping these modules covered by the compatibility
checker.
Our full contribution guidelines are in our wiki, please see:
https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
If you can't run the entire testsuite for some reason (it can be
difficult on Windows), please at least run `contrib/check-code.py` on
any files you've modified and run `python contrib/check-commit` on any
commits you've made (for example, `python contrib/check-commit
273ce12ad8f1` will report some style violations on a very old commit).