diff --git a/imgui-examples/examples/support/mod.rs b/imgui-examples/examples/support/mod.rs
index 52c4bcd..ac41295 100644
--- a/imgui-examples/examples/support/mod.rs
+++ b/imgui-examples/examples/support/mod.rs
@@ -7,7 +7,6 @@ use imgui::{Context, FontConfig, FontGlyphRanges, FontSource, Ui, ConfigFlags};
 use imgui_glium_renderer::Renderer;
 use imgui_winit_support::{HiDpiMode, WinitPlatform};
 use std::path::Path;
-use std::rc::Rc;
 use std::time::Instant;
 
 mod clipboard;
diff --git a/imgui-winit-support/src/lib.rs b/imgui-winit-support/src/lib.rs
index 0b79529..cb1a2d9 100644
--- a/imgui-winit-support/src/lib.rs
+++ b/imgui-winit-support/src/lib.rs
@@ -188,8 +188,8 @@ use winit_20 as winit;
 ))]
 use winit_19 as winit;
 
-use imgui::{self, BackendFlags, ConfigFlags, Context, Io, Key, Ui, PlatformViewportBackend, ViewportFlags, PlatformMonitor, Viewport};
-use std::{cell::Cell, rc::Rc};
+use imgui::{self, BackendFlags, ConfigFlags, Context, Io, Key, Ui, PlatformViewportBackend, ViewportFlags, PlatformMonitor};
+use std::cell::Cell; 
 use std::cmp::Ordering;
 use winit::dpi::{LogicalPosition, LogicalSize};
 
@@ -514,11 +514,11 @@ impl PlatformViewportBackend for ViewportBackend {
         window.focus_window();
     }
 
-    fn get_window_focus(&mut self, viewport: &mut imgui::Viewport) -> bool {
+    fn get_window_focus(&mut self, _viewport: &mut imgui::Viewport) -> bool {
         true
     }
 
-    fn get_window_minimized(&mut self, viewport: &mut imgui::Viewport) -> bool {
+    fn get_window_minimized(&mut self, _viewport: &mut imgui::Viewport) -> bool {
         false
     }
 
@@ -527,23 +527,23 @@ impl PlatformViewportBackend for ViewportBackend {
         window.set_title(title);
     }
 
-    fn set_window_alpha(&mut self, viewport: &mut imgui::Viewport, alpha: f32) {
+    fn set_window_alpha(&mut self, _viewport: &mut imgui::Viewport, _alpha: f32) {
 
     }
 
-    fn update_window(&mut self, viewport: &mut imgui::Viewport) {
+    fn update_window(&mut self, _viewport: &mut imgui::Viewport) {
         
     }
 
-    fn render_window(&mut self, viewport: &mut imgui::Viewport) {
+    fn render_window(&mut self, _viewport: &mut imgui::Viewport) {
         
     }
 
-    fn swap_buffers(&mut self, viewport: &mut imgui::Viewport) {
+    fn swap_buffers(&mut self, _viewport: &mut imgui::Viewport) {
         
     }
 
-    fn create_vk_surface(&mut self, viewport: &mut imgui::Viewport, instance: u64, out_surface: &mut u64) -> i32 {
+    fn create_vk_surface(&mut self, _viewport: &mut imgui::Viewport, _instance: u64, _out_surface: &mut u64) -> i32 {
         0
     }
 }
diff --git a/imgui/src/platform_io.rs b/imgui/src/platform_io.rs
index 79a7d78..191251c 100644
--- a/imgui/src/platform_io.rs
+++ b/imgui/src/platform_io.rs
@@ -186,67 +186,67 @@ pub(crate) extern "C" fn platform_create_vk_surface(viewport: *mut Viewport, ins
 
 pub(crate) struct DummyPlatformViewportBackend {}
 impl PlatformViewportBackend for DummyPlatformViewportBackend {
-    fn create_window(&mut self, viewport: &mut Viewport) {
+    fn create_window(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn destroy_window(&mut self, viewport: &mut Viewport) {
+    fn destroy_window(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn show_window(&mut self, viewport: &mut Viewport) {
+    fn show_window(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn set_window_pos(&mut self, viewport: &mut Viewport, pos: [f32; 2]) {
+    fn set_window_pos(&mut self, _viewport: &mut Viewport, _pos: [f32; 2]) {
         unimplemented!()
     }
 
-    fn get_window_pos(&mut self, viewport: &mut Viewport) -> [f32; 2] {
+    fn get_window_pos(&mut self, _viewport: &mut Viewport) -> [f32; 2] {
         unimplemented!()
     }
 
-    fn set_window_size(&mut self, viewport: &mut Viewport, size: [f32; 2]) {
+    fn set_window_size(&mut self, _viewport: &mut Viewport, _size: [f32; 2]) {
         unimplemented!()
     }
 
-    fn get_window_size(&mut self, viewport: &mut Viewport) -> [f32; 2] {
+    fn get_window_size(&mut self, _viewport: &mut Viewport) -> [f32; 2] {
         unimplemented!()
     }
 
-    fn set_window_focus(&mut self, viewport: &mut Viewport) {
+    fn set_window_focus(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn get_window_focus(&mut self, viewport: &mut Viewport) -> bool {
+    fn get_window_focus(&mut self, _viewport: &mut Viewport) -> bool {
         unimplemented!()
     }
 
-    fn get_window_minimized(&mut self, viewport: &mut Viewport) -> bool {
+    fn get_window_minimized(&mut self, _viewport: &mut Viewport) -> bool {
         unimplemented!()
     }
 
-    fn set_window_title(&mut self, viewport: &mut Viewport, title: &str) {
+    fn set_window_title(&mut self, _viewport: &mut Viewport, _title: &str) {
         unimplemented!()
     }
 
-    fn set_window_alpha(&mut self, viewport: &mut Viewport, alpha: f32) {
+    fn set_window_alpha(&mut self, _viewport: &mut Viewport, _alpha: f32) {
         unimplemented!()
     }
 
-    fn update_window(&mut self, viewport: &mut Viewport) {
+    fn update_window(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn render_window(&mut self, viewport: &mut Viewport) {
+    fn render_window(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn swap_buffers(&mut self, viewport: &mut Viewport) {
+    fn swap_buffers(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn create_vk_surface(&mut self, viewport: &mut Viewport, instance: u64, out_surface: &mut u64) -> i32 {
+    fn create_vk_surface(&mut self, _viewport: &mut Viewport, _instance: u64, _out_surface: &mut u64) -> i32 {
         unimplemented!()
     }
 }
@@ -294,23 +294,23 @@ pub(crate) extern "C" fn renderer_swap_buffers(viewport: *mut Viewport, _arg: *m
 
 pub(crate) struct DummyRendererViewportBackend {}
 impl RendererViewportBackend for DummyRendererViewportBackend {
-    fn create_window(&mut self, viewport: &mut Viewport) {
+    fn create_window(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn destroy_window(&mut self, viewport: &mut Viewport) {
+    fn destroy_window(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn set_window_size(&mut self, viewport: &mut Viewport, size: [f32; 2]) {
+    fn set_window_size(&mut self, _viewport: &mut Viewport, _size: [f32; 2]) {
         unimplemented!()
     }
 
-    fn render_window(&mut self, viewport: &mut Viewport) {
+    fn render_window(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 
-    fn swap_buffers(&mut self, viewport: &mut Viewport) {
+    fn swap_buffers(&mut self, _viewport: &mut Viewport) {
         unimplemented!()
     }
 }