[Checkins] [zopefoundation/zope.interface] 74ac18: add test; fix c optimizations

[GitHub]

  Branch: refs/heads/dont_cache_lookup_failures
  Home:   https://github.com/zopefoundation/zope.interface
  Commit: 74ac18415a6817b6be4ea9c0b2c7f199970e3e64
      https://github.com/zopefoundation/zope.interface/commit/74ac18415a6817b6be4ea9c0b2c7f199970e3e64
  Author: tschorr <t_schorr at gmx.de>
  Date:   2017-02-16 (Thu, 16 Feb 2017)

  Changed paths:
    M src/zope/interface/_zope_interface_coptimizations.c
    M src/zope/interface/tests/test_adapter.py

  Log Message:
  -----------
  add test; fix c optimizations