From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../should_reject_if_dst_has_unreachable_field.rs  | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 src/test/ui/transmutability/visibility/should_reject_if_dst_has_unreachable_field.rs

(limited to 'src/test/ui/transmutability/visibility/should_reject_if_dst_has_unreachable_field.rs')

diff --git a/src/test/ui/transmutability/visibility/should_reject_if_dst_has_unreachable_field.rs b/src/test/ui/transmutability/visibility/should_reject_if_dst_has_unreachable_field.rs
new file mode 100644
index 000000000..42799d803
--- /dev/null
+++ b/src/test/ui/transmutability/visibility/should_reject_if_dst_has_unreachable_field.rs
@@ -0,0 +1,39 @@
+//! Unless visibility is assumed, a transmutation should be rejected if the
+//! destination type contains an unreachable field (e.g., a public field with a
+//! private type). (This rule is distinct from type privacy, which still may
+//! forbid naming such types.)
+
+#![crate_type = "lib"]
+#![feature(transmutability)]
+#![allow(dead_code)]
+
+mod assert {
+    use std::mem::BikeshedIntrinsicFrom;
+
+    pub fn is_transmutable<Src, Dst, Context>()
+    where
+        Dst: BikeshedIntrinsicFrom<Src, Context, false, false, false, false>
+        // visibility is NOT assumed ---------------------------------^^^^^
+    {}
+}
+
+mod src {
+    #[repr(C)] pub(in super) struct Zst;
+
+    #[repr(C)] pub(in super) struct Src {
+        pub(in super) field: Zst,
+    }
+}
+
+mod dst {
+    #[repr(C)] pub(self) struct Zst; // <- unreachable type
+
+    #[repr(C)] pub(in super) struct Dst {
+        pub(in super) field: Zst,
+    }
+}
+
+fn test() {
+    struct Context;
+    assert::is_transmutable::<src::Src, dst::Dst, Context>(); //~ ERROR cannot be safely transmuted
+}
-- 
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