This program demonstrates a bug that may cause a fault when using
MPI_Neighbor_alltoallw.
The following MPI implementations exhibit this bug:
 * 4.0, 4.0.1, 4.0.2

The underlying issue is a confusion of send and receive arguments.

The bug is tracked at

<https://github.com/pmodels/mpich/issues/6233>

a fix is available in the file

config/checkpatch/mpich_neighbor_alltoallw.patch

distributed with YAXT.
