Announce Rust 1.92 stable release

Author: BoxyUwU

content/Rust-1.92.0.md

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+path = "2025/12/11/Rust-1.92.0"
+title = "Announcing Rust 1.92.0"
+authors = ["The Rust Release Team"]
+aliases = ["releases/1.92.0"]
+
+[extra]
+release = true
++++
+
+The Rust team is happy to announce a new version of Rust, 1.92.0. Rust is a programming language empowering everyone to build reliable and efficient software.
+
+If you have a previous version of Rust installed via `rustup`, you can get 1.92.0 with:
+
+```console
+$ rustup update stable
+```
+
+If you don't have it already, you can [get `rustup`](https://www.rust-lang.org/install.html) from the appropriate page on our website, and check out the [detailed release notes for 1.92.0](https://doc.rust-lang.org/stable/releases.html#version-1920-2025-12-11).
+
+If you'd like to help us out by testing future releases, you might consider updating locally to use the beta channel (`rustup default beta`) or the nightly channel (`rustup default nightly`). Please [report](https://github.com/rust-lang/rust/issues/new/choose) any bugs you might come across!
+
+## What's in 1.92.0 stable
+
+### Deny-by-default never type lints
+
+The language and compiler teams continue to work on stabilization of the [never type](https://doc.rust-lang.org/stable/std/primitive.never.html). In this release the [`never_type_fallback_flowing_into_unsafe`](https://doc.rust-lang.org/beta/rustc/lints/listing/deny-by-default.html#dependency-on-unit-never-type-fallback) and [`dependency_on_unit_never_type_fallback`](https://doc.rust-lang.org/beta/rustc/lints/listing/deny-by-default.html#dependency-on-unit-never-type-fallback) future compatibility lints were made deny-by-default, meaning they will cause a compilation error when detected.
+
+These lints detect code which is likely to be broken by the never type stabilization. It is highly advised to fix them if they are reported in your crate.
+
+### `unused_must_use` no longer warns about `Result<(), UninhabitedType>`
+
+Rust's `unused_must_use` lint warns when ignoring the return value of a function, if the function or its return type is annotated with `#[must_use]`. For instance, this warns if ignoring a return type of `Result`, to remind you to use `?`, or something like `.expect("...")`.
+
+However, some functions return `Result`, but the error type they use is not actually "inhabited", meaning it can never exist in real code (e.g. the [`!`](https://doc.rust-lang.org/std/primitive.never.html) or [`Infallible`](https://doc.rust-lang.org/std/convert/enum.Infallible.html) types).
+
+The `unused_must_use` lint now no longer warns on `Result<(), UninhabitedType>`, or on `ControlFlow<UninhabitedType, ()>`. For instance, it will not warn on `Result<(), !>`. This avoids having to check for an error that can never happen.
+
+```rust
+fn can_never_fail() -> Result<(), !> {
+    // ...
+    Ok(())
+}
+
+fn main() {
+    can_never_fail()
+}
+```
+
+This is particularly useful with the common pattern of a trait with an associated error type, where the error type may *sometimes* be infallible:
+
+```rust
+trait UsesAssocErrorType {
+    type Error;
+    fn method(&self) -> Result<(), Self::Error>;
+}
+
+struct CannotFail;
+impl UsesAssocErrorType for CannotFail {
+    type Error = !;
+    fn method(&self) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
+
+struct CanFail;
+impl UsesAssocErrorType for CanFail {
+    type Error = std::io::Error;
+    fn method(&self) -> Result<(), Self::Error> {
+        Err(std::io::Error::other("something went wrong"))
+    }
+}
+
+fn main() {
+    CannotFail.method(); // No error
+    CanFail.method(); // Error: unused `Result` that must be used
+}
+```
+
+### Emit unwind tables even when `-Cpanic=abort` is enabled on linux
+
+Backtraces with `-Cpanic=abort` previously worked in Rust 1.22 but were broken in Rust 1.23, as we stopped emitting unwind tables with `-Cpanic=abort`. In Rust 1.45 a workaround in the form of `-Cforce-unwind-tables=yes` was stabilized.
+
+In Rust 1.92 unwind tables will be emitted by default even when `-Cpanic=abort` is specified, allowing for backtraces to work properly. If unwind tables are not desired then users should use `-Cforce-unwind-tables=no` to explicitly disable them being emitted.
+
+### Validate input to `#[macro_export]`
+
+Over the past few releases, many changes were made to the way built-in attributes are processed in the compiler. This should greatly improve the error messages and warnings rust gives for built-in attributes and especially make these diagnostics more consistent among all of the over 100 built-in attributes.
+
+To give a small example, in this release specifically, Rust became stricter in checking what arguments are allowed to `macro_export` by [upgrading that check to a "deny-by-default lint" that will be reported in dependencies.](https://github.com/rust-lang/rust/pull/143857). 
+
+### Restrictions on user code impls of `DerefMut` for `Pin`
+
+A soundness issue with `Pin` has been solved by preventing third-party crates from implementing `DerefMut` for `Pin<T>` when `T` is a local type that doesn't implement `DerefMut<Target: Unpin>`.
+
+### Stabilized APIs
+
+...
+
+These previously stable APIs are now stable in const contexts:
+
+...
+
+### Platform Support
+
+Refer to Rust’s [platform support page][platform-support] for more information on Rust’s tiered platform support.
+
+### Other changes
+
+Check out everything that changed in [Rust](https://github.com/rust-lang/rust/releases/tag/1.92.0), [Cargo](https://doc.rust-lang.org/nightly/cargo/CHANGELOG.html#cargo-192-2025-12-11), and [Clippy](https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-192).
+
+## Contributors to 1.92.0
+
+Many people came together to create Rust 1.92.0. We couldn't have done it without all of you. [Thanks!](https://thanks.rust-lang.org/rust/1.92.0/)
+
+[platform-support]: https://doc.rust-lang.org/rustc/platform-support.html