Type Definition ash::vk::PFN_vkFreeFunction

type PFN_vkFreeFunction = Option<unsafe extern "system" fn(p_user_data: *mut c_void, p_memory: *mut c_void)>;

https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/PFN_vkFreeFunction.html