I love control flow

src/util/id.rs

@@ -26,6 +26,9 @@ impl<I: IdNum> IdTracker<I> {
 }
 
 impl<I: IdNum> Id<I> {
+    pub(crate) fn raw(id: I) -> Self {
+        Self(id)
+    }
     pub fn idx(&self) -> usize {
         self.0.idx()
     }

src/util/refcount.rs

@@ -3,6 +3,7 @@ use std::sync::{
     atomic::{AtomicU32, Ordering},
 };
 
+#[derive(Debug)]
 pub struct RefCounter(Arc<AtomicU32>);
 
 impl RefCounter {