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Enum - Never

Enum reference for iced::Never.

Version: latest | Last updated: 2026-02-19

Enum - Never

Authoritative source: ref/doc/iced/enum.Never.html.

# Rustdoc summary

The error type for errors that can never happen.

# Verified declaration

rust
pub enum Never {}

# When to use

Use this enum when modeling or configuring the set of discrete variants represented by iced::....

# Why to use

It provides explicit, typed variant semantics that match runtime and widget APIs documented in rustdoc.

# Example References

  • ref/examples/geometry/src/main.rs
  • ref/examples/websocket/src/echo.rs

# Inline Examples (from rustdoc)

rust
impl<T, U> TryFrom<U> for T where U: Into<T> {
    type Error = Infallible;

    fn try_from(value: U) -> Result<Self, Infallible> {
        Ok(U::into(value))  // Never returns `Err`
    }
}
rust
pub type Infallible = !;

# Use this when...

  • You need a typed set of variants for layout/style/runtime behavior.
  • You want pattern matching instead of ad-hoc booleans.
  • You are configuring widget behavior with explicit choices.

# Minimal example

rust
// Choose an enum variant and pass it into widget/runtime configuration.

# How it works

Enums model constrained strategy choices in Iced APIs. They keep configuration readable and make invalid combinations easier to catch at compile time.

# Common patterns

rust
// Use match expressions for app-driven variant selection.

# Gotchas / tips

  • Similar variant names may have different effects across APIs.
  • Keep variant selection close to widget config for clarity.
  • Confirm semantics in rustdoc for edge cases.