vulkano: export LoadingError
This is useful if loading the VulkanLibrary fails.
pub use ash::vk::Handle;
pub use half;
-pub use library::VulkanLibrary;
+pub use library::{LoadingError, VulkanLibrary};
use parking_lot::MutexGuard;
use std::{error::Error, fmt, ops::Deref, sync::Arc};
pub use version::Version;
