My mistake. I build from the Nov 16 git repo, but there was an older version I had in ~/.cargo/bin and some part of rust/cargo/… apparently edited by ~/.bashrc 
I’ll check the configuration and rerun the benchmarks.
I used rustc 1.74. Installed from the Rust side. It wasn’t a big deal to build. It would be nice if somewhat older Rust versions would work too. As this is my only Rust project it is ok, but if version requirements are too tight it quickly gets a mess on your dev machine unless you use a lot of containers