diff --git a/src/23524.rs b/src/23524.rs
new file mode 100644
index 00000000..bc3d7f6f
--- /dev/null
+++ b/src/23524.rs
@@ -0,0 +1,21 @@
+enum Tree<K,V> {
+    Leaf(K, V),
+    Branch(u16, [Option<Box<Tree<K,V>>>]),
+}
+
+struct Node<T: ?Sized> {
+    population: u16,
+    children: T,
+}
+
+enum Tree2<K,V> {
+    Leaf(K, V),
+    Branch(Node<Tree<K,V>>),
+}
+
+fn main() {
+    use std::mem::size_of;
+    use std::sync::atomic;
+    println!("{:?}", size_of::<&Tree<(),()>>());
+    println!("{:?}", size_of::<&Tree2<(),()>>());
+}