Arrays in Rust are value types (same as std::array in C++, which also has a compile-time size). That means the array doesn't have a separate heap allocation, bu

Arrays in Rust are value types (same as std::array in C++, which also has a compile-time size). That means the array doesn't have a separate heap allocation, but is stored inline in the struct/stack frame containing the array. The compiler needs to know the size so that it can place other struct members/local variables after the array. For dynamically-sized arrays you'd typically use a `Vec<T>` in Rust (or a `Box<[T]>`). These imply the array is stored as a separate heap allocation.