chore: checkpoint before Python removal

vendor/indicatif/examples/fastbar.rs

@@ -0,0 +1,23 @@
+use indicatif::ProgressBar;
+
+fn many_units_of_easy_work(n: u64, label: &str) {
+    let pb = ProgressBar::new(n);
+
+    let mut sum = 0;
+    for i in 0..n {
+        // Any quick computation, followed by an update to the progress bar.
+        sum += 2 * i + 3;
+        pb.inc(1);
+    }
+    pb.finish();
+
+    println!("[{}] Sum ({}) calculated in {:?}", label, sum, pb.elapsed());
+}
+
+fn main() {
+    const N: u64 = 1 << 20;
+
+    // Perform a long sequence of many simple computations monitored by a
+    // default progress bar.
+    many_units_of_easy_work(N, "Default progress bar ");
+}