--- core/src/Generator.h
+++ core/src/Generator.h
@@ -26,7 +26,7 @@
 			current_value = std::move(value);
 			return {};
 		}
-//		void return_value(T&& value) noexcept { current_value = std::move(value); }
+		void return_void() noexcept {}
 		// Disallow co_await in generator coroutines.
 		void await_transform() = delete;
 		[[noreturn]] static void unhandled_exception() { throw; }