[boost] problem with boost test matrix for serialization related to changes in file system?

I made a few checkins to the serialization library which I had previously tested on my working system. But Now I'm getting some very weird errors in the Boost Test matrix: https://www.boost.org/development/tests/develop/developer/serialization.html Anyone who has some useful insight would be free to chime in. According to P Dimov, Filesystem is guilty and i should request help from andrey semashev - so here it is. Robert Ramey