>Why would someone use this new proposed C++-with-Rust-annotations in place of just Rust? Simply making C++ compilers compatible with one another is a constant

>Why would someone use this new proposed C++-with-Rust-annotations in place of just Rust? Simply making C++ compilers compatible with one another is a constant struggle. Making Rust work well with existing C++ code is even more difficult. Thus, it is far easier to make something like Clang understand and compile C++-specific annotations alongside legacy C++ code than making rustc understand C++ types. Moreover, teams of C++ programmers will have an easier time writing annotated C++ than they would learning an entirely new language. And it's important to recognize how deeply entrenched C++ is in many areas, especially when you consider things like OpenMP, OpenACC, CUDA, HIP/ROCm, Kokkos, etc etc etc.