[Checkins] [zopefoundation/zope.interface] 2d1775: Add env vars to print differences in legacy and C3...

[Jason Madden]

  Branch: refs/heads/issue21
  Home:   https://github.com/zopefoundation/zope.interface
  Commit: 2d177550d46b22c4d11900aace170e465d0c026c
      https://github.com/zopefoundation/zope.interface/commit/2d177550d46b22c4d11900aace170e465d0c026c
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2020-03-12 (Thu, 12 Mar 2020)

  Changed paths:
    M CHANGES.rst
    M setup.py
    M src/zope/interface/ro.py
    M src/zope/interface/tests/test_ro.py

  Log Message:
  -----------
  Add env vars to print differences in legacy and C3 ROs, and to force the use of the legacy RO.