A tiny crate that exposes a Rc like struct, which can be used to create a reference counted pointer to a subregion (member, or member of member etc.) of a Rc.
```rust struct Foo { value: i32, }
let rc = Rc::new(Foo { value: 42 }); let subrc = Subrc::new(rc.clone(), |foo| &foo.value); // or let subrc = subrc!(rc.value);
// subrc derefs to 42 assert_eq!(subrc, 42); // subrc points to rc.value assert!(std::ptr::eq(&subrc, &rc.value)); ```