Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

An alternate implementation:

d = {}
for mapping in reversed(self.maps):
    d.update(mapping)
return iter(d)

Unfortunately both implementations work only with hashable keys. In general 
case mappings may be not hashtables.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32792>
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