From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:19:13 +0200
Subject: Merging upstream version 1.68.2+dfsg1.

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

(limited to 'tests/ui/transmutability/visibility/assume/should_accept_if_dst_has_unreachable_field.rs')

diff --git a/tests/ui/transmutability/visibility/assume/should_accept_if_dst_has_unreachable_field.rs b/tests/ui/transmutability/visibility/assume/should_accept_if_dst_has_unreachable_field.rs
new file mode 100644
index 000000000..546fcbaa3
--- /dev/null
+++ b/tests/ui/transmutability/visibility/assume/should_accept_if_dst_has_unreachable_field.rs
@@ -0,0 +1,39 @@
+//! If visibility is assumed, a transmutation should be accepted even 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::{Assume, BikeshedIntrinsicFrom};
+
+    pub fn is_transmutable<Src, Dst, Context>()
+    where
+        Dst: BikeshedIntrinsicFrom<Src, Context, { Assume::SAFETY }>
+        // safety IS assumed --------------------^^^^^^^^^^^^^^^^^^
+    {}
+}
+
+mod src {
+    #[repr(C)] pub(self) struct Zst;
+
+    #[repr(C)] pub(in super) struct Src {
+        pub(self) field: Zst,
+    }
+}
+
+mod dst {
+    #[repr(C)] pub(self) struct Zst; // <- unreachable type
+
+    #[repr(C)] pub(in super) struct Dst {
+        pub(in super) field: Zst, //~ ERROR private type
+    }
+}
+
+fn test() {
+    struct Context;
+    assert::is_transmutable::<src::Src, dst::Dst, Context>();
+}
-- 
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