Dear Ken, yes, I think you are right in your assessment. I created a ticket https://github.com/mpi-forum/mpi-issues/issues/438 and an accompanying PR https://github.com/mpi-forum/mpi-standard/pull/518 and we should get this out as quickly as possible as an Erratum to 4.0 Cheers, Marc-Andre On 10.02.21 22:48, Raffenetti, Kenneth J. via mpiwg-tools wrote:

Hi all,

In the latest mpi-4.0 RC pg 758, ln 16 describing MPI_T_EVENT_GET_INFO:

If the argument to enumtype provided by the user is the MPI_T_ENUM_NULL pointer, no enumeration type is returned.

This differs from previous get info functions. E.g. MPI_T_PVAR_GET_INFO:

... or the argument enumtype is the null pointer, no enumeration type is returned.

IMO, the user providing MPI_T_ENUM_NULL to enumtype doesn't make sense. The user would pass a null pointer, as it is an output argument.

Ken

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