1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/nll/drop-no-may-dangle.rs b/src/test/ui/nll/drop-no-may-dangle.rs
new file mode 100644
index 000000000..a0ff0c398
--- /dev/null
+++ b/src/test/ui/nll/drop-no-may-dangle.rs
@@ -0,0 +1,30 @@
+// Basic test for liveness constraints: the region (`R1`) that appears
+// in the type of `p` must include everything until `p` is dropped
+// because of destructor. (Note that the stderr also identifies this
+// destructor in the error message.)
+
+#![allow(warnings)]
+#![feature(dropck_eyepatch)]
+
+fn use_x(_: usize) -> bool { true }
+
+fn main() {
+    let mut v = [1, 2, 3];
+    let p: WrapMayNotDangle<&usize> = WrapMayNotDangle { value: &v[0] };
+    if true {
+        use_x(*p.value);
+    } else {
+        use_x(22);
+        v[0] += 1; //~ ERROR cannot assign to `v[_]` because it is borrowed
+    }
+
+    v[0] += 1; //~ ERROR cannot assign to `v[_]` because it is borrowed
+}
+
+struct WrapMayNotDangle<T> {
+    value: T
+}
+
+impl<T> Drop for WrapMayNotDangle<T> {
+    fn drop(&mut self) { }
+}