One thing I love about Rust is that, while the code is accidentaly quadratic, it is explicit when looking at the code and seing the call to `clone` which makes

One thing I love about Rust is that, while the code is accidentaly quadratic, it is explicit when looking at the code and seing the call to `clone` which makes it much harder to produce those behaviour than in languages where copies can happen behind the scene (C++ is often guilty of that).