[ncmncm]

More to the point, Rust lacks key features I need to capture essential semantics into libraries. So, the libraries I could write in Rust would be less powerful than libraries I can write in C++.

Among common uses for these more powerful features is to make misuse of the library into a compile-time error. Coding the library in Rust, if possible at all, would mean failing to prevent these usage errors.

The point here is that C++ puts more power in the hands of a library writer, and both the responsibility and capability to enforce safety in uses of the library. Rust jealously reserves maintaining safety to the compiler alone.

[estebank]

Could you elaborate on this?