I'm really surprised at how stable and widely supported Rust's FFI is.

I have several C++ projects that integrate a portion written in Rust, where the Rust project produces a .a file that is ultimately linked with clang into a larger C++ project.

I definitely agree Rust has a long road to adoption in embedded/low level systems, and particularly areas with custom compilers/toolchains that rely heavily on system specific undefined behavior.

But it's a lot closer than I had thought it was a year or so ago.