Plenty of C++ practitioners who still intend to mostly write C++ after learning some Rust said it actually gave them useful insights they'll be applying in future C++
We can also see in the committee proposal papers "Rust does X" has for years now been a good comeback when you need to show that X is a realistic choice not just for languages like Python which may be less concerned about performance and incur a heavy runtime, a garbage collector, etc., but also a "real" language like C++. The paper which landed code.contains("FOO") in the C++ string handling code is an example, there's a long list of languages which do this but they made sure to mention Rust.
We can also see in the committee proposal papers "Rust does X" has for years now been a good comeback when you need to show that X is a realistic choice not just for languages like Python which may be less concerned about performance and incur a heavy runtime, a garbage collector, etc., but also a "real" language like C++. The paper which landed code.contains("FOO") in the C++ string handling code is an example, there's a long list of languages which do this but they made sure to mention Rust.