Vendor things

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

@@ -0,0 +1,26 @@
+#![allow(deprecated)]
+
+use generator::*;
+
+fn xrange(start: u32, end: u32) -> u32 {
+    for i in start..end {
+        yield_with(i);
+    }
+    done!();
+}
+
+fn main() {
+    let g1 = Gn::new(|| xrange(0, 10));
+    let g2 = Gn::new(|| xrange(10, 20));
+
+    let g = Gn::new_scoped(|mut s| {
+        s.yield_from(g1);
+        s.yield_from(g2);
+        done!();
+    });
+
+    g.fold(0, |sum, x| {
+        println!("i={}, sum={}", x, sum + x);
+        sum + x
+    });
+}