Fix a bunch of warnings

src/backend/drm/backend.rs

@@ -1,10 +1,10 @@
 use super::error::*;
 use super::DevPath;
 use backend::graphics::GraphicsBackend;
-use backend::graphics::egl::{EGLGraphicsBackend, EGLContext, EGLSurface, PixelFormat, SwapBuffersError, EglExtensionNotSupportedError};
+use backend::graphics::egl::{EGLGraphicsBackend, EGLContext, EGLSurface, PixelFormat, SwapBuffersError};
 use backend::graphics::egl::error::Result as EGLResult;
 use backend::graphics::egl::native::{Gbm, GbmSurfaceArguments};
-use backend::graphics::egl::wayland::{EGLWaylandExtensions, EGLDisplay, BufferAccessError, EGLImages};
+use backend::graphics::egl::wayland::{EGLWaylandExtensions, EGLDisplay};
 use drm::control::{Device, ResourceInfo};
 use drm::control::{connector, crtc, encoder, framebuffer, Mode};
 use gbm::{Device as GbmDevice, BufferObject, BufferObjectFlags, Format as GbmFormat, Surface as GbmSurface, SurfaceBufferHandle};
@@ -13,7 +13,6 @@ use nix::libc::c_void;
 use std::cell::Cell;
 use std::rc::{Rc, Weak};
 use wayland_server::Display;
-use wayland_server::protocol::wl_buffer::WlBuffer;
 
 pub struct DrmBackend<A: Device + 'static> {
     backend: Rc<DrmBackendInternal<A>>,

src/backend/drm/mod.rs

@@ -188,11 +188,10 @@
 //! ```
 
 #[cfg(feature = "backend_session")]
-use backend::graphics::egl::EglExtensionNotSupportedError;
-use backend::graphics::egl::context::{EGLContext, GlAttributes, PixelFormatRequirements};
+use backend::graphics::egl::context::{EGLContext, GlAttributes};
 use backend::graphics::egl::error::Result as EGLResult;
 use backend::graphics::egl::native::Gbm;
-use backend::graphics::egl::wayland::{EGLWaylandExtensions, EGLDisplay, BufferAccessError, EGLImages};
+use backend::graphics::egl::wayland::{EGLWaylandExtensions, EGLDisplay};
 #[cfg(feature = "backend_session")]
 use backend::session::SessionObserver;
 use drm::Device as BasicDevice;
@@ -215,7 +214,6 @@ use wayland_server::{EventLoopHandle, StateToken};
 use wayland_server::sources::{FdEventSource, FdEventSourceImpl, FdInterest};
 #[cfg(feature = "backend_session")]
 use wayland_server::{Display, StateProxy};
-use wayland_server::protocol::wl_buffer::WlBuffer;
 
 mod backend;
 pub mod error;
@@ -569,7 +567,7 @@ impl<A: ControlDevice + 'static> SessionObserver for StateToken<DrmDevice<A>> {
     }
 
     fn activate<'a>(&mut self, state: &mut StateProxy<'a>) {
-        state.with_value(self, |state, device| {
+        let mut device = state.get_mut(self);
         device.active = true;
         if let Err(err) = device.set_master() {
             crit!(
@@ -597,6 +595,5 @@ impl<A: ControlDevice + 'static> SessionObserver for StateToken<DrmDevice<A>> {
         for crtc in crtcs {
             device.backends.remove(&crtc);
         }
-        })
     }
 }

src/backend/graphics/egl/mod.rs

@@ -8,8 +8,6 @@
 use super::GraphicsBackend;
 use nix::libc::c_void;
 use std::fmt;
-use wayland_server::Display;
-use wayland_server::protocol::wl_buffer::WlBuffer;
 
 pub mod context;
 pub use self::context::EGLContext;

src/backend/graphics/egl/native.rs

@@ -16,8 +16,6 @@ use winit::Window as WinitWindow;
 #[cfg(feature = "backend_winit")]
 use winit::os::unix::WindowExt;
 #[cfg(feature = "backend_winit")]
-use nix::libc::c_void;
-#[cfg(feature = "backend_winit")]
 use wayland_client::egl as wegl;
 
 pub trait Backend {

src/backend/graphics/egl/wayland.rs

@@ -4,7 +4,7 @@ use backend::graphics::egl::ffi::egl::types::EGLImage;
 use nix::libc::{c_uint};
 use std::rc::{Rc, Weak};
 use std::fmt;
-use wayland_server::{Display, Resource, StateToken, StateProxy};
+use wayland_server::{Display, Resource};
 use wayland_server::protocol::wl_buffer::WlBuffer;
 use wayland_sys::server::wl_display;
 

src/backend/graphics/glium.rs

@@ -1,7 +1,7 @@
 //! Glium compatibility module
 
-use backend::graphics::egl::{EGLGraphicsBackend, SwapBuffersError, EglExtensionNotSupportedError};
-use backend::graphics::egl::wayland::{BufferAccessError, EGLImages, EGLWaylandExtensions, EGLDisplay};
+use backend::graphics::egl::{EGLGraphicsBackend, SwapBuffersError};
+use backend::graphics::egl::wayland::{EGLWaylandExtensions, EGLDisplay};
 use backend::graphics::egl::error::Result as EGLResult;
 use glium::Frame;
 use glium::SwapBuffersError as GliumSwapBuffersError;
@@ -11,7 +11,6 @@ use std::borrow::Borrow;
 use std::os::raw::c_void;
 use std::rc::Rc;
 use wayland_server::Display;
-use wayland_server::protocol::wl_buffer::WlBuffer;
 
 impl From<SwapBuffersError> for GliumSwapBuffersError {
     fn from(error: SwapBuffersError) -> Self {

src/backend/udev.rs

@@ -14,7 +14,7 @@ use drm::control::Device as ControlDevice;
 use backend::drm::{drm_device_bind, DrmDevice, DrmHandler};
 use backend::session::{Session, SessionObserver};
 use nix::fcntl;
-use nix::sys::stat::{dev_t, fstat};
+use nix::sys::stat::dev_t;
 use std::collections::HashMap;
 use std::ffi::OsString;
 use std::io::{Error as IoError, Result as IoResult};

src/backend/winit.rs

@@ -1,12 +1,12 @@
 //! Implementation of backend traits for types provided by `winit`
 
 use backend::graphics::GraphicsBackend;
-use backend::graphics::egl::{EGLGraphicsBackend, EGLContext, EGLSurface, PixelFormat, SwapBuffersError, EglExtensionNotSupportedError};
+use backend::graphics::egl::{EGLGraphicsBackend, EGLContext, EGLSurface, PixelFormat, SwapBuffersError};
 use backend::graphics::egl::error as egl_error;
 use backend::graphics::egl::error::Result as EGLResult;
 use backend::graphics::egl::native;
 use backend::graphics::egl::context::GlAttributes;
-use backend::graphics::egl::wayland::{EGLWaylandExtensions, EGLImages, Format, BufferAccessError, EGLDisplay};
+use backend::graphics::egl::wayland::{EGLWaylandExtensions, EGLDisplay};
 use backend::input::{Axis, AxisSource, Event as BackendEvent, InputBackend, InputHandler, KeyState,
                      KeyboardKeyEvent, MouseButton, MouseButtonState, PointerAxisEvent, PointerButtonEvent,
                      PointerMotionAbsoluteEvent, Seat, SeatCapabilities, TouchCancelEvent, TouchDownEvent,
@@ -20,7 +20,6 @@ use winit::{ElementState, Event, EventsLoop, KeyboardInput, MouseButton as Winit
             MouseScrollDelta, Touch, TouchPhase, WindowBuilder, WindowEvent, Window as WinitWindow};
 use wayland_client::egl as wegl;
 use wayland_server::Display;
-use wayland_server::protocol::wl_buffer::WlBuffer;
 
 error_chain! {
     errors {