tests/ui/let_unit: fix comment and example code

The previous version would had deadlocked as the Sender remained alive
and iterator would had never became complete. Just in case someone
decided to run it.

diff --git a/tests/ui/let_unit.rs b/tests/ui/let_unit.rs
index 0b0afccef45c796e98727ac98a8795b83b6ecfab..d07cf8ede2f403b2cd82a83c9c8a7d01d9896660 100644 (file)
--- a/tests/ui/let_unit.rs
+++ b/tests/ui/let_unit.rs
@@ -33,9 +33,11 @@ fn consume_units_with_for_loop() {
     }
     assert_eq!(count, 3);
 
-    // Same for consuming from some other Iterator<()>.
+    // Same for consuming from some other Iterator<Item = ()>.
     let (tx, rx) = ::std::sync::mpsc::channel();
     tx.send(()).unwrap();
+    drop(tx);
+
     count = 0;
     for _ in rx.iter() {
         count += 1;