chore: checkpoint before Python removal

vendor/dyn-clone/examples/readme.rs

@@ -0,0 +1,26 @@
+use dyn_clone::DynClone;
+
+trait MyTrait: DynClone {
+    fn recite(&self);
+}
+
+impl MyTrait for String {
+    fn recite(&self) {
+        println!("{} ♫", self);
+    }
+}
+
+fn main() {
+    let line = "The slithy structs did gyre and gimble the namespace";
+
+    // Build a trait object holding a String.
+    // This requires String to implement MyTrait and std::clone::Clone.
+    let x: Box<dyn MyTrait> = Box::new(String::from(line));
+
+    x.recite();
+
+    // The type of x2 is a Box<dyn MyTrait> cloned from x.
+    let x2 = dyn_clone::clone_box(&*x);
+
+    x2.recite();
+}