Address warnings from latest version of rustc (#213)

Author: micahrj

src/win/drop_target.rs

@@ -27,19 +27,22 @@ use super::WindowState;
 // These function pointers have to be stored in a (const) variable before they can be transmuted
 // Transmuting is needed because winapi has a bug where the pt parameter has an incorrect
 // type `*const POINTL`
+#[allow(non_snake_case)]
 const DRAG_ENTER_PTR: unsafe extern "system" fn(
     this: *mut IDropTarget,
     pDataObj: *const IDataObject,
     grfKeyState: DWORD,
     pt: POINTL,
     pdwEffect: *mut DWORD,
 ) -> HRESULT = DropTarget::drag_enter;
+#[allow(non_snake_case)]
 const DRAG_OVER_PTR: unsafe extern "system" fn(
     this: *mut IDropTarget,
     grfKeyState: DWORD,
     pt: POINTL,
     pdwEffect: *mut DWORD,
 ) -> HRESULT = DropTarget::drag_over;
+#[allow(non_snake_case)]
 const DROP_PTR: unsafe extern "system" fn(
     this: *mut IDropTarget,
     pDataObj: *const IDataObject,

src/win/window.rs

@@ -519,19 +519,19 @@ pub(super) struct WindowState {
 }
 
 impl WindowState {
-    pub(super) fn create_window(&self) -> Window {
+    pub(super) fn create_window(&self) -> Window<'_> {
         Window { state: self }
     }
 
-    pub(super) fn window_info(&self) -> Ref<WindowInfo> {
+    pub(super) fn window_info(&self) -> Ref<'_, WindowInfo> {
         self.window_info.borrow()
     }
 
-    pub(super) fn keyboard_state(&self) -> Ref<KeyboardState> {
+    pub(super) fn keyboard_state(&self) -> Ref<'_, KeyboardState> {
         self.keyboard_state.borrow()
     }
 
-    pub(super) fn handler_mut(&self) -> RefMut<Option<Box<dyn WindowHandler>>> {
+    pub(super) fn handler_mut(&self) -> RefMut<'_, Option<Box<dyn WindowHandler>>> {
         self.handler.borrow_mut()
     }