Fix Message type to Never in UpdateFn for ()

core/src/lib.rs

@@ -85,13 +85,14 @@ pub use widget::Widget;
 
 pub use bytes::Bytes;
 pub use smol_str::SmolStr;
+pub use std::convert::Infallible as Never;
 
 /// A function that can _never_ be called.
 ///
 /// This is useful to turn generic types into anything
 /// you want by coercing them into a type with no possible
 /// values.
-pub fn never<T>(never: std::convert::Infallible) -> T {
+pub fn never<T>(never: Never) -> T {
     match never {}
 }
 

examples/geometry/src/main.rs

@@ -169,15 +169,15 @@ mod rainbow {
     }
 }
 
-use iced::Element;
 use iced::widget::{center_x, center_y, column, scrollable};
+use iced::{Element, Never};
 use rainbow::rainbow;
 
 pub fn main() -> iced::Result {
     iced::run((), view)
 }
 
-fn view(_state: &()) -> Element<'_, ()> {
+fn view(_state: &()) -> Element<'_, Never> {
     let content = column![
         rainbow(),
         "In this example we draw a custom widget Rainbow, using \

src/application.rs

@@ -36,8 +36,8 @@ use crate::shell;
 use crate::theme;
 use crate::window;
 use crate::{
-    Element, Executor, Font, Preset, Result, Settings, Size, Subscription,
-    Task, Theme,
+    Element, Executor, Font, Never, Preset, Result, Settings, Size,
+    Subscription, Task, Theme,
 };
 
 use iced_debug as debug;
@@ -600,8 +600,8 @@ pub trait UpdateFn<State, Message> {
     fn update(&self, state: &mut State, message: Message) -> Task<Message>;
 }
 
-impl<State, Message> UpdateFn<State, Message> for () {
-    fn update(&self, _state: &mut State, _message: Message) -> Task<Message> {
+impl<State> UpdateFn<State, Never> for () {
+    fn update(&self, _state: &mut State, _message: Never) -> Task<Never> {
         Task::none()
     }
 }

src/lib.rs

@@ -533,8 +533,9 @@ pub use crate::core::padding;
 pub use crate::core::theme;
 pub use crate::core::{
     Alignment, Animation, Background, Border, Color, ContentFit, Degrees,
-    Function, Gradient, Length, Padding, Pixels, Point, Radians, Rectangle,
-    Rotation, Settings, Shadow, Size, Theme, Transformation, Vector, never,
+    Function, Gradient, Length, Never, Padding, Pixels, Point, Radians,
+    Rectangle, Rotation, Settings, Shadow, Size, Theme, Transformation, Vector,
+    never,
 };
 pub use crate::program::Preset;
 pub use crate::program::message;