From a4b7ed7a42c716ab9f05e351f003d589124fd55d Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:18:58 +0200
Subject: Adding upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tests/ui/issues/issue-36278-prefix-nesting.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 tests/ui/issues/issue-36278-prefix-nesting.rs

(limited to 'tests/ui/issues/issue-36278-prefix-nesting.rs')

diff --git a/tests/ui/issues/issue-36278-prefix-nesting.rs b/tests/ui/issues/issue-36278-prefix-nesting.rs
new file mode 100644
index 000000000..a809f7f13
--- /dev/null
+++ b/tests/ui/issues/issue-36278-prefix-nesting.rs
@@ -0,0 +1,20 @@
+// run-pass
+// Issue 36278: On an unsized struct with >1 level of nontrivial
+// nesting, ensure we are computing dynamic size of prefix correctly.
+
+use std::mem;
+
+const SZ: usize = 100;
+#[allow(unused_tuple_struct_fields)]
+struct P<T: ?Sized>([u8; SZ], T);
+
+type Ack<T> = P<P<T>>;
+
+fn main() {
+    let size_of_sized; let size_of_unsized;
+    let x: Box<Ack<[u8; 0]>> = Box::new(P([0; SZ], P([0; SZ], [0; 0])));
+    size_of_sized = mem::size_of_val::<Ack<_>>(&x);
+    let y: Box<Ack<[u8   ]>> = x;
+    size_of_unsized = mem::size_of_val::<Ack<_>>(&y);
+    assert_eq!(size_of_sized, size_of_unsized);
+}
-- 
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