add features

src/Library.bf

@@ -23,6 +23,12 @@ static
 	public const let VK_NULL_HANDLE = 0;
 }
 
+extension VkResult
+{
+	[NoShow(false), SkipCall, Warn("VkResult discarded")]
+	public void ReturnValueDiscarded();
+}
+
 namespace Vulkan.Metadata;
 
 extension VulkanExtension