MPI_COMM_DUP_FN(3) on Linux
The text 95abc2c01256, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it. The page shows this text now.
Built-in MPI function to simple-mindedly copy communicator attributes.