typon.hpp: Ensure forked task destructors are called ASAP

rt/include/typon/typon.hpp

@@ -16,7 +16,10 @@ namespace typon
   template <typename Task>
   Fork<typename Task::promise_type::value_type> fork(Task task)
   {
-    co_return co_await std::move(task);
+    // Put the task in a local variable to ensure its destructor will
+    // be called on co_return instead of only on coroutine destruction.
+    Task local_task = std::move(task);
+    co_return co_await std::move(local_task);
   }
 
 }