3e437bbd7b
is responsible for checking this condition. At the datatype engine, I accept it just as a nice way to set the soft UB for a data (without using a real UB marker). This approach can be used to create the subarray and darray datatype. However from the MPI level this function should never be called directly with a count set to 0. This commit was SVN r4512.
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...more to write here
should be a short file, referring to the real docs.