Merge remote-tracking branch 'upstream/main' into fix-enum-variant-inconsistency

1 files changed, 63 insertions, 62 deletions

diff --git a/exercises/19_smart_pointers/rc1.rs b/exercises/19_smart_pointers/rc1.rs
index 1b90346..48e19dc 100644
--- a/exercises/19_smart_pointers/rc1.rs
+++ b/exercises/19_smart_pointers/rc1.rs
@@ -1,22 +1,14 @@
-// rc1.rs
-//
 // In this exercise, we want to express the concept of multiple owners via the
-// Rc<T> type. This is a model of our solar system - there is a Sun type and
-// multiple Planets. The Planets take ownership of the sun, indicating that they
-// revolve around the sun.
-//
-// Make this code compile by using the proper Rc primitives to express that the
-// sun has multiple owners.
-//
-// Execute `rustlings hint rc1` or use the `hint` watch subcommand for a hint.
-
-// I AM NOT DONE
+// `Rc<T>` type. This is a model of our solar system - there is a `Sun` type and
+// multiple `Planet`s. The planets take ownership of the sun, indicating that
+// they revolve around the sun.
 
 use std::rc::Rc;
 
 #[derive(Debug)]
-struct Sun {}
+struct Sun;
 
+#[allow(dead_code)]
 #[derive(Debug)]
 enum Planet {
     Mercury(Rc<Sun>),
@@ -31,75 +23,84 @@ enum Planet {
 
 impl Planet {
     fn details(&self) {
-        println!("Hi from {:?}!", self)
+        println!("Hi from {self:?}!");
     }
 }
 
-#[test]
 fn main() {
-    let sun = Rc::new(Sun {});
-    println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
 
-    let mercury = Planet::Mercury(Rc::clone(&sun));
-    println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
-    mercury.details();
+    #[test]
+    fn rc1() {
+        let sun = Rc::new(Sun);
+        println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
 
-    let venus = Planet::Venus(Rc::clone(&sun));
-    println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
-    venus.details();
+        let mercury = Planet::Mercury(Rc::clone(&sun));
+        println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
+        mercury.details();
 
-    let earth = Planet::Earth(Rc::clone(&sun));
-    println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
-    earth.details();
+        let venus = Planet::Venus(Rc::clone(&sun));
+        println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
+        venus.details();
 
-    let mars = Planet::Mars(Rc::clone(&sun));
-    println!("reference count = {}", Rc::strong_count(&sun)); // 5 references
-    mars.details();
+        let earth = Planet::Earth(Rc::clone(&sun));
+        println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
+        earth.details();
 
-    let jupiter = Planet::Jupiter(Rc::clone(&sun));
-    println!("reference count = {}", Rc::strong_count(&sun)); // 6 references
-    jupiter.details();
+        let mars = Planet::Mars(Rc::clone(&sun));
+        println!("reference count = {}", Rc::strong_count(&sun)); // 5 references
+        mars.details();
 
-    // TODO
-    let saturn = Planet::Saturn(Rc::new(Sun {}));
-    println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
-    saturn.details();
+        let jupiter = Planet::Jupiter(Rc::clone(&sun));
+        println!("reference count = {}", Rc::strong_count(&sun)); // 6 references
+        jupiter.details();
 
-    // TODO
-    let uranus = Planet::Uranus(Rc::new(Sun {}));
-    println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
-    uranus.details();
+        // TODO
+        let saturn = Planet::Saturn(Rc::new(Sun));
+        println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
+        saturn.details();
 
-    // TODO
-    let neptune = Planet::Neptune(Rc::new(Sun {}));
-    println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
-    neptune.details();
+        // TODO
+        let uranus = Planet::Uranus(Rc::new(Sun));
+        println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
+        uranus.details();
 
-    assert_eq!(Rc::strong_count(&sun), 9);
+        // TODO
+        let neptune = Planet::Neptune(Rc::new(Sun));
+        println!("reference count = {}", Rc::strong_count(&sun)); // 9 references
+        neptune.details();
 
-    drop(neptune);
-    println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
+        assert_eq!(Rc::strong_count(&sun), 9);
 
-    drop(uranus);
-    println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
+        drop(neptune);
+        println!("reference count = {}", Rc::strong_count(&sun)); // 8 references
 
-    drop(saturn);
-    println!("reference count = {}", Rc::strong_count(&sun)); // 6 references
+        drop(uranus);
+        println!("reference count = {}", Rc::strong_count(&sun)); // 7 references
 
-    drop(jupiter);
-    println!("reference count = {}", Rc::strong_count(&sun)); // 5 references
+        drop(saturn);
+        println!("reference count = {}", Rc::strong_count(&sun)); // 6 references
 
-    drop(mars);
-    println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
+        drop(jupiter);
+        println!("reference count = {}", Rc::strong_count(&sun)); // 5 references
 
-    // TODO
-    println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
+        drop(mars);
+        println!("reference count = {}", Rc::strong_count(&sun)); // 4 references
 
-    // TODO
-    println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
+        // TODO
+        println!("reference count = {}", Rc::strong_count(&sun)); // 3 references
 
-    // TODO
-    println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
+        // TODO
+        println!("reference count = {}", Rc::strong_count(&sun)); // 2 references
 
-    assert_eq!(Rc::strong_count(&sun), 1);
+        // TODO
+        println!("reference count = {}", Rc::strong_count(&sun)); // 1 reference
+
+        assert_eq!(Rc::strong_count(&sun), 1);
+    }
 }