SyntaxError on Python 2 with 3.79.2

[reaperhulk]

The latest release causes a SyntaxError on older Python 2.7 (occurs on 2.7.3 and 2.7.5 in pyca/cryptography's CI):

Traceback (most recent call last):
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pytest.py", line 77, in <module>
    raise SystemExit(pytest.main())
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/_pytest/config/__init__.py", line 49, in main
    config = _prepareconfig(args, plugins)
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/_pytest/config/__init__.py", line 186, in _prepareconfig
    pluginmanager=pluginmanager, args=args
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pluggy/hooks.py", line 284, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pluggy/manager.py", line 67, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pluggy/manager.py", line 61, in <lambda>
    firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pluggy/callers.py", line 203, in _multicall
    gen.send(outcome)
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/_pytest/helpconfig.py", line 89, in pytest_cmdline_parse
    config = outcome.get_result()
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pluggy/callers.py", line 81, in get_result
    _reraise(*ex)  # noqa
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pluggy/callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/_pytest/config/__init__.py", line 656, in pytest_cmdline_parse
    self.parse(args)
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/_pytest/config/__init__.py", line 828, in parse
    self._preparse(args, addopts=addopts)
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/_pytest/config/__init__.py", line 780, in _preparse
    self.pluginmanager.load_setuptools_entrypoints("pytest11")
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pluggy/manager.py", line 267, in load_setuptools_entrypoints
    plugin = ep.load()
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2332, in load
    return self.resolve()
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2338, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/hypothesis/__init__.py", line 30, in <module>
    from hypothesis.core import given, find, example, seed, reproduce_failure, \
  File "/home/jenkins/workspace/4485-S2JEK2AOWI4X57D@2/cryptography/.tox/py27/local/lib/python2.7/site-packages/hypothesis/core.py", line 948
    exec(
SyntaxError: unqualified exec is not allowed in function 'wrapped_test' it is a nested function

[Zac-HD]

Oh... dear. I don't want to drop traceback elision entirely for Python 2, but the best solution so far is eval(exec(...)) behind a version guard 😱... I'll keep looking.

[Zac-HD]

The root cause is BPO-21591, so I don't think there's going to be a better solution 😭