From 8bd023c2a632e8e8f6143357c8526b49d543217e Mon Sep 17 00:00:00 2001
From: Maarten Arnst <maarten.arnst@uliege.be>
Date: Wed, 26 Aug 2026 13:11:48 +0200
Subject: [PATCH] Add trailing return type to when_all get_env

Signed-off-by: Maarten Arnst <maarten.arnst@uliege.be>
---
 include/stdexec/__detail/__when_all.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/stdexec/__detail/__when_all.hpp b/include/stdexec/__detail/__when_all.hpp
index 305bf4f57..014bed231 100644
--- a/include/stdexec/__detail/__when_all.hpp
+++ b/include/stdexec/__detail/__when_all.hpp
@@ -766,6 +766,9 @@ namespace STDEXEC
       }
 
       static constexpr auto __get_env = []<class _State>(__ignore, _State const & __state) noexcept
+        -> __if_c<_State::__uses_stop_source,
+                  __stoppable_env_t<env_of_t<typename _State::__receiver_t const &>>,
+                  env_of_t<typename _State::__receiver_t const &>>
       {
         if constexpr (_State::__uses_stop_source)
         {