Eliminate build warnings

Cargo.toml

@@ -1,4 +1,5 @@
 [package]
+edition = "2015"
 name = "scrap"
 description = "Screen capture made easy."
 version = "0.5.0"

build.rs

@@ -1,4 +1,5 @@
 fn main() {
+    println!("cargo::rustc-check-cfg=cfg(dxgi,quartz,x11)");
     if cfg!(windows) {
         // The first choice is Windows because DXGI is amazing.
         println!("cargo:rustc-cfg=dxgi");

src/dxgi/mod.rs

@@ -50,9 +50,11 @@ impl Capturer {
         let mut device = ptr::null_mut();
         let mut context = ptr::null_mut();
         let mut duplication = ptr::null_mut();
-        let mut desc = unsafe { mem::uninitialized() };
+        let mut desc = unsafe { mem::zeroed() };
 
         if unsafe {
+            let mut feature_level = D3D_FEATURE_LEVEL_9_1;
+
             D3D11CreateDevice(
                 &mut **display.adapter,
                 D3D_DRIVER_TYPE_UNKNOWN,
@@ -62,7 +64,7 @@ impl Capturer {
                 0, // Feature levels' length.
                 D3D11_SDK_VERSION,
                 &mut device,
-                &mut D3D_FEATURE_LEVEL_9_1,
+                &mut feature_level,
                 &mut context
             )
         } != S_OK {
@@ -105,7 +107,7 @@ impl Capturer {
 
     unsafe fn load_frame(&mut self, timeout: UINT) -> io::Result<()> {
         let mut frame = ptr::null_mut();
-        let mut info = mem::uninitialized();
+        let mut info = mem::zeroed();
         self.data = ptr::null_mut();
 
         wrap_hresult((*self.duplication).AcquireNextFrame(
@@ -115,7 +117,7 @@ impl Capturer {
         ))?;
 
         if self.fastlane {
-            let mut rect = mem::uninitialized();
+            let mut rect = mem::zeroed();
             let res = wrap_hresult(
                 (*self.duplication).MapDesktopSurface(&mut rect)
             );
@@ -133,7 +135,7 @@ impl Capturer {
             self.surface = ptr::null_mut();
             self.surface = self.ohgodwhat(frame)?;
 
-            let mut rect = mem::uninitialized();
+            let mut rect = mem::zeroed();
             wrap_hresult((*self.surface).Map(
                 &mut rect,
                 DXGI_MAP_READ
@@ -155,7 +157,7 @@ impl Capturer {
             &mut texture as *mut *mut _ as *mut *mut _
         );
 
-        let mut texture_desc = mem::uninitialized();
+        let mut texture_desc = mem::zeroed();
         (*texture).GetDesc(&mut texture_desc);
 
         texture_desc.Usage = D3D11_USAGE_STAGING;
@@ -302,14 +304,14 @@ impl Displays {
         // We get the display's details.
 
         let desc = unsafe {
-            let mut desc = mem::uninitialized();
+            let mut desc = mem::zeroed();
             (*output).GetDesc(&mut desc);
             desc
         };
 
         // We cast it up to the version needed for desktop duplication.
 
-        let mut inner = ptr::null_mut();
+        let mut inner = ptr::null_mut() as *mut IDXGIOutput1;
         unsafe {
             (*output).QueryInterface(
                 &IID_IDXGIOUTPUT1,

src/quartz/display.rs

@@ -12,7 +12,7 @@ impl Display {
 
     pub fn online() -> Result<Vec<Display>, CGError> {
         unsafe {
-            let mut arr: [u32; 16] = mem::uninitialized();
+            let mut arr: [u32; 16] = mem::zeroed();
             let mut len: u32 = 0;
 
             match CGGetOnlineDisplayList(16, arr.as_mut_ptr(), &mut len) {