> Some badass below even just said that "writing C++ code longer than a few lines without UB is humanly impossible". Apparently all these FUBAR C/C++ systems (Linux and Windows kernels, all? web browsers, LLVM that the dear rust uses, device drivers, web servers, router software, VMs of Lua, Python, C#, Java, ..., etc.) work well enough to transfer that kind of garbage to me.

Yes, they work well enough, until they don't, because realistically, they are rife with dependencies on undefined behaviour. Linux can only be compiled with gcc last I checked.