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Hi all,

I am having some trouble getting our application to work with the most
recent (CFFI) version of PyOpenCL, 2015.2.1.  The issue appears to be
related to get_sub_region returning None as opposed to a buffer.

Looking through the source code I found


<https://github.com/pyopencl/pyopencl/blob/23ba40d62bcf1d066233575ae8743
e5e0ed8a5ae/pyopencl/cffi_cl.py#L942>

which appears to be its implementation.  The issue, it seems, is that
the method never returns the sub region that has just been created --
hence why we're seeing None.

Regards, Freddie.
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