Making newer Rust happen also required LLVM 14, which was also spearheaded by @rubdos
Indeed, @rubdos started working on LLVM upgrades since late september and his work was reported in : Sailfish Community News, 5 October, Camera2 progress
There are two opened merge requests at the moment to move LLVM to 15 or even 16 (with joined work from @rubdos and @direc85).