2 Checks for usage of `.clone()` on a ref-counted pointer,
3 (`Rc`, `Arc`, `rc::Weak`, or `sync::Weak`), and suggests calling Clone via unified
4 function syntax instead (e.g., `Rc::clone(foo)`).
7 Calling '.clone()' on an Rc, Arc, or Weak
8 can obscure the fact that only the pointer is being cloned, not the underlying