[issue16200] Setting .posix=True for shlex object causes infinite loop in __next__

[Ezio Melotti]

Ezio Melotti added the comment:

Making .posix read-only is technically backward-incompatible, but I'm not sure if there are cases where people might have changed its value without incurring in the bug.  Leaving .posix read/writable and changing .eof accordingly might be a better solution.

As a side note, you can use assertRaises (possibly as a context manager) in the tests.

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stage:  -> patch review
versions: +Python 3.2

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