New upstream version 1.70.0+dfsg1

[rustc.git] / tests / ui / borrowck / drop-in-loop.rs

diff --git a/tests/ui/borrowck/drop-in-loop.rs b/tests/ui/borrowck/drop-in-loop.rs
new file mode 100644 (file)
index 0000000..866c27e
--- /dev/null
+++ b/tests/ui/borrowck/drop-in-loop.rs
@@ -0,0 +1,24 @@
+// A version of `issue-70919-drop-in-loop`, but without
+// the necessary `drop` call.
+//
+// This should fail to compile, since the `Drop` impl
+// for `WrapperWithDrop` could observe the changed
+// `base` value.
+
+struct WrapperWithDrop<'a>(&'a mut bool);
+impl<'a> Drop for WrapperWithDrop<'a> {
+    fn drop(&mut self) {
+    }
+}
+
+fn drop_in_loop() {
+    let mut base = true;
+    let mut wrapper = WrapperWithDrop(&mut base);
+    loop {
+        base = false; //~ ERROR: cannot assign to `base`
+        wrapper = WrapperWithDrop(&mut base);
+    }
+}
+
+fn main() {
+}