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What's new in PyPy3 5.9+
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.. this is the revision after release-pypy3.5-5.9
.. startrev: be41e3ac0a29

.. branch: sched_yield
Add sched_yield posix attribute

.. branch: py3.5-appexec
Raise if space.is_true(space.appexec()) used in app level tests, fix tests
that did this

.. branch: py3.5-mac-embedding
Download and patch dependencies when building cffi-based stdlib modules

.. branch: os_lockf

.. branch: py3.5-xattr
Add posix.*attr() functions
