From fb184e2303dd9accc74ec62b42393061b13dddb5 Mon Sep 17 00:00:00 2001
From: isidorostsa <tsa.isidoros@gmail.com>
Date: Sat, 17 Aug 2024 18:10:25 +0300
Subject: [PATCH] stop_token callback_type

---
 libs/core/execution/tests/unit/environment_queries.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/libs/core/execution/tests/unit/environment_queries.cpp b/libs/core/execution/tests/unit/environment_queries.cpp
index 0fd1a81494f..3d71adefd60 100644
--- a/libs/core/execution/tests/unit/environment_queries.cpp
+++ b/libs/core/execution/tests/unit/environment_queries.cpp
@@ -74,6 +74,13 @@ namespace mylib {
     struct stop_token
     {
 #if defined(HPX_HAVE_STDEXEC)
+        // TODO: Find out the correct type for this alias.
+        // Based on:
+        // https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2024/
+        // p2300r10.html#design-cancellation-summary
+        template<typename T>
+        using callback_type = void;
+
         bool stop_requested() const noexcept
         {
             return false;