added a simple example creating a sender

Author: dietmarkuehl

examples/CMakeLists.txt

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 # cmake-format: on
 
-list(APPEND EXAMPLES when_all-cancel stop_token stopping allocator)
+list(APPEND EXAMPLES sender-demo when_all-cancel stop_token stopping allocator)
 
 foreach(EXAMPLE ${EXAMPLES})
   set(EXAMPLE_TARGET ${TARGET_PREFIX}.examples.${EXAMPLE})

examples/just_stopped.cpp

@@ -0,0 +1,17 @@
+#include <beman/execution26/execution.hpp>
+namespace ex = beman::execution26;
+
+struct receiver {
+    using receiver_concept = ex::receiver_t;
+    auto set_value(auto&&...) noexcept -> void {}
+    auto set_error(auto&&) noexcept -> void {}
+    auto set_stopped() noexcept -> void {}
+};
+
+int main() {
+    // ex::sync_wait(ex::just_stopped() | ex::then([]{}));
+    auto then = ex::just_stopped() | ex::then([] {});
+    static_assert(std::same_as<void, decltype(ex::get_completion_signatures(then, ex::empty_env()))>);
+
+    ex::connect(ex::just_stopped() | ex::then([] {}), receiver{});
+}