Merging upstream version 1.73.0+dfsg1.

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

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/ui/traits/trait-upcasting/upcast-through-struct-tail.rs b/tests/ui/traits/trait-upcasting/upcast-through-struct-tail.rs
new file mode 100644
index 000000000..42495f45f
--- /dev/null
+++ b/tests/ui/traits/trait-upcasting/upcast-through-struct-tail.rs
@@ -0,0 +1,14 @@
+// revisions: current next
+//[next] compile-flags: -Ztrait-solver=next
+
+struct Wrapper<T: ?Sized>(T);
+
+trait A: B {}
+trait B {}
+
+fn test<'a>(x: Box<Wrapper<dyn A + 'a>>) -> Box<Wrapper<dyn B + 'a>> {
+    x
+    //~^ ERROR cannot cast `dyn A` to `dyn B`, trait upcasting coercion is experimental
+}
+
+fn main() {}