fix warnings/errors (#1692)

examples/src/bin/immutable-sampler/main.rs

@@ -160,7 +160,8 @@ fn main() {
         let png_bytes = include_bytes!("image_img.png").to_vec();
         let cursor = Cursor::new(png_bytes);
         let decoder = png::Decoder::new(cursor);
-        let (info, mut reader) = decoder.read_info().unwrap();
+        let mut reader = decoder.read_info().unwrap();
+        let info = reader.info();
         let dimensions = ImageDimensions::Dim2d {
             width: info.width,
             height: info.height,

vulkano-win/src/winit.rs

@@ -1,8 +1,6 @@
 use std::borrow::Borrow;
 use std::error;
 use std::fmt;
-#[cfg(target_os = "windows")]
-use std::ptr;
 use std::rc::Rc;
 use std::sync::Arc;
 

vulkano/src/buffer/device_local.rs

@@ -31,18 +31,28 @@ use crate::memory::pool::MemoryPoolAlloc;
 use crate::memory::pool::PotentialDedicatedAllocation;
 use crate::memory::pool::StdMemoryPoolAlloc;
 use crate::memory::{DedicatedAlloc, MemoryRequirements};
-use crate::memory::{DeviceMemoryAllocError, ExternalMemoryHandleType};
+use crate::memory::DeviceMemoryAllocError;
 use crate::sync::AccessError;
 use crate::sync::Sharing;
 use crate::DeviceSize;
 use smallvec::SmallVec;
-use std::fs::File;
 use std::hash::Hash;
 use std::hash::Hasher;
 use std::marker::PhantomData;
 use std::mem;
 use std::sync::Arc;
 use std::sync::Mutex;
+#[cfg(any(
+    target_os = "linux",
+    target_os = "dragonflybsd",
+    target_os = "freebsd",
+    target_os = "netbsd",
+    target_os = "openbsd"
+))]
+use {
+    crate::memory::ExternalMemoryHandleType,
+    std::fs::File
+};
 
 /// Buffer whose content is in device-local memory.
 ///

vulkano/src/sync/semaphore/semaphore.rs

@@ -304,11 +304,8 @@ impl From<OomError> for SemaphoreError {
 
 #[cfg(test)]
 mod tests {
-    use crate::device::physical::PhysicalDevice;
-    use crate::device::{Device, DeviceExtensions};
-    use crate::instance::{Instance, InstanceExtensions};
     use crate::VulkanObject;
-    use crate::{sync::Semaphore, Version};
+    use crate::sync::Semaphore;
 
     #[test]
     fn semaphore_create() {
@@ -342,6 +339,11 @@ mod tests {
         target_os = "openbsd"
     ))]
     fn semaphore_export() {
+        use crate::device::physical::PhysicalDevice;
+        use crate::device::{Device, DeviceExtensions};
+        use crate::instance::{Instance, InstanceExtensions};
+        use crate::Version;
+
         let supported_ext = InstanceExtensions::supported_by_core().unwrap();
         if supported_ext.khr_get_display_properties2
             && supported_ext.khr_external_semaphore_capabilities