Fix most warnings

examples/enumerate.rs

@@ -1,7 +1,5 @@
 extern crate cpal;
 
-use cpal::*;
-
 fn main() {
     let endpoints = cpal::get_endpoints_list();
     

src/wasapi/mod.rs

@@ -37,7 +37,6 @@ fn check_result(result: winapi::HRESULT) -> Result<(), IoError> {
 
 /// Wrapper because of that stupid decision to remove `Send` and `Sync` from raw pointers.
 #[derive(Copy, Clone)]
-#[allow(raw_pointer_derive)]
 struct IAudioClientWrapper(*mut winapi::IAudioClient);
 unsafe impl Send for IAudioClientWrapper {}
 unsafe impl Sync for IAudioClientWrapper {}

src/wasapi/voice.rs

@@ -5,11 +5,9 @@ use super::winapi;
 use super::Endpoint;
 use super::check_result;
 
-use std::cmp;
 use std::slice;
 use std::mem;
 use std::ptr;
-use std::marker::PhantomData;
 use std::sync::atomic::AtomicBool;
 use std::sync::atomic::Ordering;
 use std::sync::Arc;
@@ -221,7 +219,7 @@ impl Voice {
                 }
 
                 match check_result((*audio_client).SetEventHandle(event)) {
-                    Err(e) => {
+                    Err(_) => {
                         (*audio_client).Release();
                         panic!("Failed to call SetEventHandle")
                     },
@@ -333,7 +331,7 @@ impl Stream for SamplesStream {
     type Item = UnknownTypeBuffer;
     type Error = ();
 
-    fn poll(&mut self, task: &mut Task) -> Poll<Option<Self::Item>, Self::Error> {
+    fn poll(&mut self, _: &mut Task) -> Poll<Option<Self::Item>, Self::Error> {
         unsafe {
             if self.ready.swap(false, Ordering::Relaxed) == false {
                 let result = kernel32::WaitForSingleObject(self.event, 0);
@@ -356,8 +354,6 @@ impl Stream for SamplesStream {
                 self.max_frames_in_buffer - padding
             };
 
-            assert!(frames_available >= 0);
-
             // Obtaining a pointer to the buffer.
             let (buffer_data, buffer_len) = {
                 let mut buffer: *mut winapi::BYTE = mem::uninitialized();