The common scenario for f and g to consume x is that x is a smart pointer type e.g. Rc/Arc. to make it clear that the clone is "cheap", some Rust developer pre

The common scenario for f and g to consume x is that x is a smart pointer type e.g. Rc/Arc. to make it clear that the clone is "cheap", some Rust developer prefer using `Arc::Clone(&x)` over `x.clone()`.