Vendor things

third-party/vendor/generator/examples/range.rs

@@ -0,0 +1,16 @@
+use generator::{done, Gn};
+
+fn main() {
+    let n = 100000;
+    let range = Gn::new_scoped(move |mut s| {
+        let mut num = 0;
+        while num < n {
+            s.yield_(num);
+            num += 1;
+        }
+        done!();
+    });
+
+    let sum: usize = range.sum();
+    println!("sum ={sum}");
+}