Comment by haberman

Coming from C++, this always throws me a bit:

    if (0..=10).contains(&5) {

I assume we are taking a ref to "5" (and not passing by value) because "Range" is a generic type that might be too big to want to copy (or it may not be copyable at all). But taking a reference to a number for a simple operation like this feels... weird. It makes me worry that Rust is going to be passing around pointers to some stack-allocated "5", but I hope that Rust is actually much smarter than that?