Type Alias FnSubmitDebugUtilsMessageEXT 

pub type FnSubmitDebugUtilsMessageEXT = extern "system" fn(instance: Instance, messageSeverity: DebugUtilsMessageSeverityFlagBitsEXT, messageTypes: DebugUtilsMessageTypeFlagsEXT, pCallbackData: *const DebugUtilsMessengerCallbackDataEXT);