From fc76052495997c6fb6ded38f146c72c3220f2b90 Mon Sep 17 00:00:00 2001
From: Arnaud VERSINI <arnaud.versini@pm.me>
Date: Mon, 2 Feb 2026 16:25:00 +0100
Subject: [PATCH] rust : use repr(transparent) when we should

Change-Id: Iaf8334aa8d83c170454dffc8438395a395246938
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/198557
Reviewed-by: Arnaud Versini <arnaud.versini@pm.me>
Tested-by: Jenkins
---
 codemaker/source/rustmaker/rustproduce.cxx | 1 +
 rust_uno/src/core/any.rs                   | 1 +
 rust_uno/src/core/oustring.rs              | 1 +
 rust_uno/src/core/sequence.rs              | 1 +
 rust_uno/src/core/type.rs                  | 1 +
 5 files changed, 5 insertions(+)

diff --git a/codemaker/source/rustmaker/rustproduce.cxx b/codemaker/source/rustmaker/rustproduce.cxx
index b6da46888a16..88e2d21002bd 100644
--- a/codemaker/source/rustmaker/rustproduce.cxx
+++ b/codemaker/source/rustmaker/rustproduce.cxx
@@ -613,6 +613,7 @@ void RustProducer::generateInterfaceWrapper(
         .endLine()
         .beginLine()
         .append("#[allow(non_camel_case_types)]")
+        .append("#[repr(transparent)]")
         .endLine()
         .beginLine()
         .append("pub struct ")
diff --git a/rust_uno/src/core/any.rs b/rust_uno/src/core/any.rs
index 7e307239720b..90b4273a29ff 100644
--- a/rust_uno/src/core/any.rs
+++ b/rust_uno/src/core/any.rs
@@ -34,6 +34,7 @@ use crate::ffi::uno_any::*;
 ///
 /// Any provides a safe, memory-managed interface to LibreOffice's native
 /// any type. It automatically handles reference counting and memory cleanup.
+#[repr(transparent)]
 pub struct Any {
     inner: uno_Any,
 }
diff --git a/rust_uno/src/core/oustring.rs b/rust_uno/src/core/oustring.rs
index 23433330490e..3d25c8f644d9 100644
--- a/rust_uno/src/core/oustring.rs
+++ b/rust_uno/src/core/oustring.rs
@@ -36,6 +36,7 @@ use crate::ffi::sal_types::*;
 /// OUString provides a safe, memory-managed interface to LibreOffice's native
 /// string type. It automatically handles reference counting and memory cleanup,
 /// and provides conversions to/from standard Rust string types.
+#[repr(transparent)]
 pub struct OUString {
     inner: NonNull<rtl_uString>,
 }
diff --git a/rust_uno/src/core/sequence.rs b/rust_uno/src/core/sequence.rs
index f9d8a237b0a2..2fe75666f392 100644
--- a/rust_uno/src/core/sequence.rs
+++ b/rust_uno/src/core/sequence.rs
@@ -37,6 +37,7 @@ use std::ptr::NonNull;
 ///
 /// Sequence provides a safe, memory-managed interface to LibreOffice's native
 /// Sequence type. It automatically handles reference counting and memory cleanup.
+#[repr(transparent)]
 pub struct Sequence {
     inner: NonNull<uno_Sequence>,
 }
diff --git a/rust_uno/src/core/type.rs b/rust_uno/src/core/type.rs
index 21363952ddcf..a86c0c3e837e 100644
--- a/rust_uno/src/core/type.rs
+++ b/rust_uno/src/core/type.rs
@@ -54,6 +54,7 @@ use std::ptr;
 /// ));
 /// ```
 #[allow(non_snake_case)] // _pType follows FFI naming conventions
+#[repr(transparent)]
 pub struct Type {
     /// C typelib reference pointer
     _pType: *mut typelib_TypeDescriptionReference,