1 files changed, 32 insertions, 0 deletions

diff --git a/src/test/ui/issues/issue-33387.rs b/src/test/ui/issues/issue-33387.rs
new file mode 100644
index 000000000..499fa7c1f
--- /dev/null
+++ b/src/test/ui/issues/issue-33387.rs
@@ -0,0 +1,32 @@
+// run-pass
+#![feature(rustc_attrs)]
+
+use std::sync::Arc;
+
+trait Foo {
+    fn get(&self) -> [u8; 2];
+}
+
+impl Foo for [u8; 2] {
+    fn get(&self) -> [u8; 2] {
+        *self
+    }
+}
+
+struct Bar<T: ?Sized>(T);
+
+fn unsize_fat_ptr<'a>(x: &'a Bar<dyn Foo + Send + 'a>) -> &'a Bar<dyn Foo + 'a> {
+    x
+}
+
+fn unsize_nested_fat_ptr(x: Arc<dyn Foo + Send>) -> Arc<dyn Foo> {
+    x
+}
+
+fn main() {
+    let x: Box<Bar<dyn Foo + Send>> = Box::new(Bar([1,2]));
+    assert_eq!(unsize_fat_ptr(&*x).0.get(), [1, 2]);
+
+    let x: Arc<dyn Foo + Send> = Arc::new([3, 4]);
+    assert_eq!(unsize_nested_fat_ptr(x).get(), [3, 4]);
+}