From c80d356ddb9b441f82dce30e7edacb64473564e8 Mon Sep 17 00:00:00 2001
From: Christoph Froehlich <christoph.froehlich@ait.ac.at>
Date: Fri, 13 Mar 2026 07:51:16 +0000
Subject: [PATCH] Add a deprecation warning to tl_expected

---
 tl_expected/include/tl_expected/expected.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tl_expected/include/tl_expected/expected.hpp b/tl_expected/include/tl_expected/expected.hpp
index ae90975..9a2c653 100644
--- a/tl_expected/include/tl_expected/expected.hpp
+++ b/tl_expected/include/tl_expected/expected.hpp
@@ -16,6 +16,9 @@
 #ifndef TL_EXPECTED_HPP
 #define TL_EXPECTED_HPP
 
+#warning "tl_expected/expected.hpp is deprecated and will be removed by the ROS 2 Lyrical Luth release. \
+  Use <tl/expected.hpp> from libexpected-dev, or <rcpputils/tl_expected/expected.hpp> if the system header is not available."
+
 #define TL_EXPECTED_VERSION_MAJOR 1
 #define TL_EXPECTED_VERSION_MINOR 2
 #define TL_EXPECTED_VERSION_PATCH 0