I imagine that for Google, one path that would make sense would be 1) upgrading their C++ to Carbon and then 2) making sure that the Rust + Carbon interoperabil

I imagine that for Google, one path that would make sense would be 1) upgrading their C++ to Carbon and then 2) making sure that the Rust + Carbon interoperability is solid. Of course, in a company of Google’s size, I’m sure different groups are pushing all reasonable options.