[issue14205] Raise an error if a dict is modified during a lookup

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 93748e2d64e3 by Antoine Pitrou in branch 'default':
Issue #14417: Mutating a dict during lookup now restarts the lookup instead of raising a RuntimeError (undoes issue #14205).
http://hg.python.org/cpython/rev/93748e2d64e3

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