Vendor things

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

@@ -0,0 +1,30 @@
+use generator::*;
+
+fn factors(n: u32) -> Generator<'static, (), u32> {
+    Gn::new_scoped(move |mut s| {
+        if n == 0 {
+            return 0;
+        }
+
+        s.yield_with(1);
+
+        for i in 2..n {
+            if n % i == 0 {
+                s.yield_with(i);
+            }
+        }
+        done!();
+    })
+}
+
+fn main() {
+    for i in factors(28) {
+        println!("{i}");
+    }
+
+    (0..10000)
+        .filter(|n| factors(*n).sum::<u32>() == *n)
+        .fold((), |_, n| {
+            println!("n = {n}");
+        })
+}