2 files changed, 55 insertions, 0 deletions
diff --git a/tests/ui/layout/issue-112048-unsizing-field-order.rs b/tests/ui/layout/issue-112048-unsizing-field-order.rs
new file mode 100644
index 00000000000..ebc4b9e98b7
--- /dev/null
+++ b/tests/ui/layout/issue-112048-unsizing-field-order.rs
@@ -0,0 +1,25 @@
+// run-pass
+
+// Check that unsizing doesn't reorder fields.
+
+#![allow(dead_code)]
+
+use std::fmt::Debug;
+
+#[derive(Debug)]
+struct GcNode<T: ?Sized> {
+    gets_swapped_with_next: usize,
+    next: Option<&'static GcNode<dyn Debug>>,
+    tail: T,
+}
+
+fn main() {
+    let node: Box<GcNode<dyn Debug>> = Box::new(GcNode {
+        gets_swapped_with_next: 42,
+        next: None,
+        tail: Box::new(1),
+    });
+
+    assert_eq!(node.gets_swapped_with_next, 42);
+    assert!(node.next.is_none());
+}
diff --git a/tests/ui/layout/issue-112048-unsizing-niche.rs b/tests/ui/layout/issue-112048-unsizing-niche.rs
new file mode 100644
index 00000000000..23588ba36ee
--- /dev/null
+++ b/tests/ui/layout/issue-112048-unsizing-niche.rs
@@ -0,0 +1,30 @@
+// run-pass
+
+// Check that unsizing does not change which field is considered for niche layout.
+
+#![feature(offset_of)]
+#![allow(dead_code)]
+
+#[derive(Clone)]
+struct WideptrField<T: ?Sized> {
+    first: usize,
+    second: usize,
+    niche: NicheAtEnd,
+    tail: T,
+}
+
+#[derive(Clone)]
+#[repr(C)]
+struct NicheAtEnd {
+    arr: [u8; 7],
+    b: bool,
+}
+
+type Tail = [bool; 8];
+
+fn main() {
+    assert_eq!(
+        core::mem::offset_of!(WideptrField<Tail>, niche),
+        core::mem::offset_of!(WideptrField<dyn Send>, niche)
+    );
+}