interior mutability woes

src/main.rs

@@ -5,6 +5,7 @@ mod distance;
 mod parse;
 
 use std::{
+    borrow::Borrow,
     cell::RefCell,
     collections::{hash_map::Entry, HashMap},
     rc::Rc,
@@ -34,12 +35,23 @@ impl Node {
     }
 }
 
-#[derive(Debug, Clone)]
+#[derive(Clone)]
 struct Destination {
-    airport: Rc<RefCell<Node>>,
+    node: Rc<RefCell<Node>>,
     distance: f64,
 }
 
+impl std::fmt::Debug for Destination {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let node = self.node.as_ref().borrow();
+
+        f.debug_struct("Node")
+            .field("origin", &node.origin)
+            .field("distance", &self.distance)
+            .finish()
+    }
+}
+
 impl Destination {
     fn new(source: &airport::Airport, destination: Rc<airport::Airport>, graph: &Graph) -> Self {
         Destination {
@@ -47,7 +59,7 @@ impl Destination {
                 (source.lat, source.lon),
                 (destination.lat, destination.lon),
             ),
-            airport: graph[&destination.id].clone(),
+            node: graph[&destination.id].clone(),
         }
     }
 }
@@ -116,4 +128,6 @@ fn main() {
             entry.destinations.push(destination);
         };
     }
+
+    println!("{graph:#?}")
 }