From ab29f7e33acb61d7942506419d0aa9a27880e3d3 Mon Sep 17 00:00:00 2001
From: romintomasetti <romin.tomasetti@gmail.com>
Date: Tue, 19 May 2026 14:51:46 +0000
Subject: [PATCH 1/3] exec: fork join trailing return type

To avoid issues with incomplete types.

Signed-off-by: romintomasetti <romin.tomasetti@gmail.com>
---
 include/exec/fork_join.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/exec/fork_join.hpp b/include/exec/fork_join.hpp
index c9aa3421e..436b70e44 100644
--- a/include/exec/fork_join.hpp
+++ b/include/exec/fork_join.hpp
@@ -293,6 +293,9 @@ namespace experimental::execution::__fork_join
 
     static constexpr auto __connect =
       []<class _Receiver, class _Sender>(_Sender&& __sndr, _Receiver&& __rcvr) noexcept
+      -> fork_join_impl_t::_opstate_t<STDEXEC::__child_of<_Sender>,
+                                      STDEXEC::__data_of<_Sender>,
+                                      _Receiver>
     {
       using _closures_t = STDEXEC::__data_of<_Sender>;
       using _sndr_t     = STDEXEC::__child_of<_Sender>;

From a9a8a19326aaee8c1e00d28a6ba62028f916f213 Mon Sep 17 00:00:00 2001
From: Eric Niebler <eniebler@boost.org>
Date: Tue, 19 May 2026 17:58:16 -0700
Subject: [PATCH 2/3] in `fork_join_t::__connect`, take receiver by value

Co-authored-by: Eric Niebler <eniebler@boost.org>
---
 include/exec/fork_join.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/exec/fork_join.hpp b/include/exec/fork_join.hpp
index 436b70e44..9b78911c4 100644
--- a/include/exec/fork_join.hpp
+++ b/include/exec/fork_join.hpp
@@ -292,7 +292,7 @@ namespace experimental::execution::__fork_join
     }
 
     static constexpr auto __connect =
-      []<class _Receiver, class _Sender>(_Sender&& __sndr, _Receiver&& __rcvr) noexcept
+      []<class _Receiver, class _Sender>(_Sender&& __sndr, _Receiver __rcvr) noexcept
       -> fork_join_impl_t::_opstate_t<STDEXEC::__child_of<_Sender>,
                                       STDEXEC::__data_of<_Sender>,
                                       _Receiver>

From fb9170ab2cca9336d978d28475405ab5c8e80642 Mon Sep 17 00:00:00 2001
From: Eric Niebler <eniebler@nvidia.com>
Date: Tue, 19 May 2026 19:07:58 -0700
Subject: [PATCH 3/3] format

---
 include/exec/fork_join.hpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/exec/fork_join.hpp b/include/exec/fork_join.hpp
index 9b78911c4..222b96bf2 100644
--- a/include/exec/fork_join.hpp
+++ b/include/exec/fork_join.hpp
@@ -291,8 +291,8 @@ namespace experimental::execution::__fork_join
       }
     }
 
-    static constexpr auto __connect =
-      []<class _Receiver, class _Sender>(_Sender&& __sndr, _Receiver __rcvr) noexcept
+    static constexpr auto __connect = []<class _Receiver, class _Sender>(_Sender&& __sndr,
+                                                                         _Receiver __rcvr) noexcept
       -> fork_join_impl_t::_opstate_t<STDEXEC::__child_of<_Sender>,
                                       STDEXEC::__data_of<_Sender>,
                                       _Receiver>