From 793f4526ae0f8a175d82b8b7fb0c8749196e1f20 Mon Sep 17 00:00:00 2001
From: anonymous <shyeyian@petalmail.com>
Date: Thu, 28 Aug 2025 18:09:52 +0800
Subject: [PATCH] Fix gcc modulize build. When trying to compile
 `beman/execution` into `C++20 Modules`, g++ complains about `exposes TU-local
 entity get(...)` in `beman/execution/detail/completion_domain.hpp`, where -
 `get` is defined to do compile-time type calculation - `get` is a
 function-local lambda with local captures (that is to say, is TU-local) -
 TU-local entities will indirectly affect all the entities which depends on it
 to be not `module-exportable`. So we made a tiny change on `get` function,
 making it `constexpr` and `exportable`.

---
 include/beman/execution/detail/completion_domain.hpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/beman/execution/detail/completion_domain.hpp b/include/beman/execution/detail/completion_domain.hpp
index ea345ad6..f9d1e72e 100644
--- a/include/beman/execution/detail/completion_domain.hpp
+++ b/include/beman/execution/detail/completion_domain.hpp
@@ -43,7 +43,7 @@ template <typename Default = ::beman::execution::default_domain, typename Sender
 constexpr auto completion_domain(const Sender& sender) noexcept {
 
     static_assert(::beman::execution::sender<Sender>);
-    auto get = [&sender]<typename Tag>(Tag) {
+    constexpr auto get = []<typename Tag>(Tag, const Sender& sender) {
         if constexpr (requires {
                           ::beman::execution::get_domain(
                               ::beman::execution::get_completion_scheduler<Tag>(::beman::execution::get_env(sender)));
@@ -56,9 +56,9 @@ constexpr auto completion_domain(const Sender& sender) noexcept {
     };
 
     using type = typename completion_domain_merge<
-        typename completion_domain_merge<decltype(get(::beman::execution::set_error)),
-                                         decltype(get(::beman::execution::set_stopped))>::type,
-        decltype(get(::beman::execution::set_value))>::type;
+        typename completion_domain_merge<decltype(get(::beman::execution::set_error, sender)),
+                                         decltype(get(::beman::execution::set_stopped, sender))>::type,
+        decltype(get(::beman::execution::set_value, sender))>::type;
     return ::std::conditional_t< ::std::same_as<type, completion_domain_undefined>, Default, type>();
 }
 } // namespace beman::execution::detail