_Qdoffs when compiling with an SDK of 10.7 or later.  The OS X APIs they
wrap have long been deprecated and have now been removed with 10.7.
These modules were already empty for 64-bit builds and have been removed
in Python 3.  (Original patch by Ronald Oussoren.)

Amaury Forgeot d'Arc. Added tests for partial decoding of non-BMP
characters.

Patch by Martin Packman.

Patch from Tom Tromey.

Issue #16485: Fix file descriptor not being closed if file header patching fails on closing of aifc file.

The code isn't exactly equivalent because a classmethod would
only make sense inside a chain class, and it would need "cls"
as a first argument, and it would need to return an instance
of "chain" rather than a generator.

The updated example drops the @classmethod decorator so that
it can be used standalone:  list(from_iterable(['abc', 'def']))
This should be communicate what from_iterable does.