# \[$\] Stabilizing Rust's never type

DevFeed: [\[$\] Stabilizing Rust's never type](<https://devfeed.tech/articles/stabilizing-rust-s-never-type-8491.md>)

Original publisher: [Read original article](<https://lwn.net/Articles/1091015/>)

Author: daroc

Published: 2026-09-08T13:34:38Z

Content type: article

Language: en

Sources: [LWN.net](<https://devfeed.tech/sources/lwn-net.md>)

Topics: [Rust](<https://devfeed.tech/topics/rust.md>), [Compiler](<https://devfeed.tech/topics/compiler.md>), [Code](<https://devfeed.tech/topics/code.md>), [function](<https://devfeed.tech/topics/function.md>)

Tags: [change](<https://devfeed.tech/tags/change.md>), [code](<https://devfeed.tech/tags/code.md>), [compiler](<https://devfeed.tech/tags/compiler.md>), [error](<https://devfeed.tech/tags/error.md>), [function](<https://devfeed.tech/tags/function.md>), [maintainers](<https://devfeed.tech/tags/maintainers.md>), [optimize](<https://devfeed.tech/tags/optimize.md>), [rust](<https://devfeed.tech/tags/rust.md>)

## AI overview

The article explains Rust's never type, denoted by "!", and reports that it was stabilized after more than two years of work. It discusses the feature's practical benefits for optimizing generic code and its role in type inference, while noting a small breaking change to previous Rust editions.

## Source excerpt

A function's return type is supposed to indicate the kind of data that it produces. Rust's "never" type, which is denoted by an exclamation mark ("!"), is the type the language uses to mark a function that never returns and other places where a value can never occur. For a long time, the never type was used internally by the compiler, but was considered an unstable feature. On August 24, after more than two years of work, Rust-compiler-contributor "waffle" finally managed to stabilize the type. It took so long, in part, because it involved a small breaking change to previous Rust editions, which the compiler maintainers needed to ensure did not impact much real code.