[Checkins] [zopefoundation/zope.schema] 37b2ee: Fix tests on PyPy3.

[GitHub]

  Branch: refs/heads/issue49
  Home:   https://github.com/zopefoundation/zope.schema
  Commit: 37b2ee37347c93f8a64b445b50ae9a9a160acdf6
      https://github.com/zopefoundation/zope.schema/commit/37b2ee37347c93f8a64b445b50ae9a9a160acdf6
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2018-08-30 (Thu, 30 Aug 2018)

  Changed paths:
    M src/zope/schema/_field.py

  Log Message:
  -----------
  Fix tests on PyPy3.

Previously they would fail like this:

  File /home/travis/build/zopefoundation/zope.schema/src/zope/schema/_bootstrapfields.py, line 522, in fromUnicode
    raise self._validation_error(*last_exc.args).with_field_and_value(self, value)
TypeError: __init__() missing 1 required positional argument: 'literal'



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