day 13 task 2 UI fix

src/tasks/day13.rs

@@ -81,20 +81,25 @@ impl Game {
         self.pc.clear_output();
         let done = self.pc.run_until_input_empty();
         let output = self.pc.get_output().into_iter().map(|it| *it).collect_vec();
-        let mut score = 0;
+        let mut score = None;
         output
             .iter()
             .tuples()
             .scan(&mut self.field, |map, (x, y, t)| {
                 if *x == -1 && *y == 0 {
-                    score = *t;
+                    score = Some(*t);
                 } else {
                     map.insert((*x, *y), FieldType::from(*t));
                 }
                 Some(())
             })
             .any(|_| false);
-        self.score = score;
+
+        // stupid workaround because I cannot access score from within the clojure,
+        // due to then double-borrowing of mutable reference to self
+        if let Some(score) = score {
+            self.score = score;
+        }
         if self.show_output {
             self.print();
         }