Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-28498-ugeh-ex1.rs b/tests/ui/issues/issue-28498-ugeh-ex1.rs
new file mode 100644
index 000000000..24bf706ce
--- /dev/null
+++ b/tests/ui/issues/issue-28498-ugeh-ex1.rs
@@ -0,0 +1,27 @@
+// run-pass
+
+// Example taken from RFC 1238 text
+
+// https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
+//     #example-of-the-unguarded-escape-hatch
+
+#![feature(dropck_eyepatch)]
+use std::cell::Cell;
+
+struct Concrete<'a>(#[allow(unused_tuple_struct_fields)] u32, Cell<Option<&'a Concrete<'a>>>);
+
+struct Foo<T> { data: Vec<T> }
+
+// Below is the UGEH attribute
+unsafe impl<#[may_dangle] T> Drop for Foo<T> {
+    fn drop(&mut self) { }
+}
+
+fn main() {
+    let mut foo = Foo {  data: Vec::new() };
+    foo.data.push(Concrete(0, Cell::new(None)));
+    foo.data.push(Concrete(0, Cell::new(None)));
+
+    foo.data[0].1.set(Some(&foo.data[1]));
+    foo.data[1].1.set(Some(&foo.data[0]));
+}