1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs b/tests/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs
new file mode 100644
index 00000000000..6a38764a131
--- /dev/null
+++ b/tests/ui/for-loop-while/for-loop-lifetime-of-unbound-values.rs
@@ -0,0 +1,34 @@
+// run-pass
+// Test when destructors run in a for loop. The intention is
+// that the value for each iteration is dropped *after* the loop
+// body has executed. This is true even when the value is assigned
+// to a `_` pattern (and hence ignored).
+
+use std::cell::Cell;
+
+struct Flag<'a>(&'a Cell<bool>);
+
+impl<'a> Drop for Flag<'a> {
+    fn drop(&mut self) {
+        self.0.set(false)
+    }
+}
+
+fn main() {
+    let alive2 = Cell::new(true);
+    for _i in std::iter::once(Flag(&alive2)) {
+        // The Flag value should be alive in the for loop body
+        assert_eq!(alive2.get(), true);
+    }
+    // The Flag value should be dead outside of the loop
+    assert_eq!(alive2.get(), false);
+
+    let alive = Cell::new(true);
+    for _ in std::iter::once(Flag(&alive)) {
+        // The Flag value should be alive in the for loop body even if it wasn't
+        // bound by the for loop
+        assert_eq!(alive.get(), true);
+    }
+    // The Flag value should be dead outside of the loop
+    assert_eq!(alive.get(), false);
+}