pub type PFN_vkAllocateMemory = unsafe extern "system" fn(_device: Device, _allocate_info: *const MemoryAllocateInfo, _allocator: *const AllocationCallbacks, _memory: *mut DeviceMemory) -> Result;pub type PFN_vkAllocateMemory = unsafe extern "system" fn(_device: Device, _allocate_info: *const MemoryAllocateInfo, _allocator: *const AllocationCallbacks, _memory: *mut DeviceMemory) -> Result;