As I mentioned, I'm pretty sure that the failing venv test is due to the bundled pip.  Here's the test output:

test test_venv failed -- Traceback (most recent call last):
  File "/home/esnow/projects/cpython/Lib/test/test_venv.py", line 356, in test_with_pip
    with_pip=True)
subprocess.CalledProcessError: Command '['/tmp/tmphxh1zztf/bin/python', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/esnow/projects/cpython/Lib/test/test_venv.py", line 362, in test_with_pip
    self.fail(msg.format(exc, details))
AssertionError: Command '['/tmp/tmphxh1zztf/bin/python', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1

**Subprocess Output**
Traceback (most recent call last):
  File "/home/esnow/projects/cpython/Lib/runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/esnow/projects/cpython/Lib/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/esnow/projects/cpython/Lib/ensurepip/__main__.py", line 4, in <module>
    ensurepip._main()
  File "/home/esnow/projects/cpython/Lib/ensurepip/__init__.py", line 209, in _main
    default_pip=args.default_pip,
  File "/home/esnow/projects/cpython/Lib/ensurepip/__init__.py", line 116, in bootstrap
    _run_pip(args + [p[0] for p in _PROJECTS], additional_paths)
  File "/home/esnow/projects/cpython/Lib/ensurepip/__init__.py", line 40, in _run_pip
    import pip
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load
  File "<frozen importlib._bootstrap>", line 947, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 625, in _load_backward_compatible
  File "/tmp/tmp57j9vkrt/pip-6.1.1-py2.py3-none-any.whl/pip/__init__.py", line 13, in <module>
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load
  File "<frozen importlib._bootstrap>", line 947, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 625, in _load_backward_compatible
  File "/tmp/tmp57j9vkrt/pip-6.1.1-py2.py3-none-any.whl/pip/utils/__init__.py", line 22, in <module>
  File "<frozen importlib._bootstrap>", line 958, in _find_and_load
  File "<frozen importlib._bootstrap>", line 947, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 625, in _load_backward_compatible
  File "/tmp/tmp57j9vkrt/pip-6.1.1-py2.py3-none-any.whl/pip/_vendor/pkg_resources/__init__.py", line 1712, in <module>
AttributeError: module 'importlib._bootstrap' has no attribute 'SourceFileLoader'