feat: Stabilize Edition 2024

Author: epage

src/cargo/core/features.rs

@@ -200,9 +200,9 @@ impl Edition {
     /// The latest edition that is unstable.
     ///
     /// This is `None` if there is no next unstable edition.
-    pub const LATEST_UNSTABLE: Option<Edition> = Some(Edition::Edition2024);
+    pub const LATEST_UNSTABLE: Option<Edition> = None;
     /// The latest stable edition.
-    pub const LATEST_STABLE: Edition = Edition::Edition2021;
+    pub const LATEST_STABLE: Edition = Edition::Edition2024;
     pub const ALL: &'static [Edition] = &[
         Self::Edition2015,
         Self::Edition2018,
@@ -223,7 +223,7 @@ impl Edition {
             Edition2015 => None,
             Edition2018 => Some(semver::Version::new(1, 31, 0)),
             Edition2021 => Some(semver::Version::new(1, 56, 0)),
-            Edition2024 => None,
+            Edition2024 => Some(semver::Version::new(1, 85, 0)),
         }
     }
 
@@ -234,7 +234,7 @@ impl Edition {
             Edition2015 => true,
             Edition2018 => true,
             Edition2021 => true,
-            Edition2024 => false,
+            Edition2024 => true,
         }
     }
 
@@ -507,7 +507,7 @@ features! {
     (stable, workspace_inheritance, "1.64", "reference/unstable.html#workspace-inheritance"),
 
     /// Support for 2024 edition.
-    (unstable, edition2024, "", "reference/unstable.html#edition-2024"),
+    (stable, edition2024, "1.85", "reference/unstable.html#edition-2024"),
 
     /// Allow setting trim-paths in a profile to control the sanitisation of file paths in build outputs.
     (unstable, trim_paths, "", "reference/unstable.html#profile-trim-paths-option"),

src/cargo/util/toml/mod.rs

@@ -1217,9 +1217,7 @@ pub fn to_real_manifest(
     //     features.require(Feature::edition20xx())?;
     // }
     // ```
-    if edition == Edition::Edition2024 {
-        features.require(Feature::edition2024())?;
-    } else if !edition.is_stable() {
+    if !edition.is_stable() {
         // Guard in case someone forgets to add .require()
         return Err(util::errors::internal(format!(
             "edition {} should be gated",

src/doc/src/reference/resolver.md

@@ -507,7 +507,7 @@ resolver = "2"
 - `"2"` ([`edition = "2021"`](manifest.md#the-edition-field) default): Introduces changes in [feature
 unification](#features). See the [features chapter][features-2] for more
 details.
-- `"3"` (requires Rust 1.84+): Change the default for [`resolver.incompatible-rust-versions`] from `allow` to `fallback`
+- `"3"` ([`edition = "2024"`](manifest.md#the-edition-field) default, requires Rust 1.84+): Change the default for [`resolver.incompatible-rust-versions`] from `allow` to `fallback`
 
 The resolver is a global option that affects the entire workspace. The
 `resolver` version in dependencies is ignored, only the value in the top-level

src/doc/src/reference/unstable.md

@@ -100,7 +100,6 @@ Each new feature described below should explain how to use it.
     * [codegen-backend](#codegen-backend) --- Select the codegen backend used by rustc.
     * [per-package-target](#per-package-target) --- Sets the `--target` to use for each individual package.
     * [artifact dependencies](#artifact-dependencies) --- Allow build artifacts to be included into other build artifacts and build them for different targets.
-    * [Edition 2024](#edition-2024) — Adds support for the 2024 Edition.
     * [Profile `trim-paths` option](#profile-trim-paths-option) --- Control the sanitization of file paths in build outputs.
     * [`[lints.cargo]`](#lintscargo) --- Allows configuring lints for Cargo.
     * [path bases](#path-bases) --- Named base directories for path dependencies.
@@ -1363,32 +1362,6 @@ Differences between `cargo run --manifest-path <path>` and `cargo <path>`
 
 ### Documentation Updates
 
-## Edition 2024
-* Tracking Issue: (none created yet)
-* RFC: [rust-lang/rfcs#3501](https://github.com/rust-lang/rfcs/pull/3501)
-
-Support for the 2024 [edition] can be enabled by adding the `edition2024`
-unstable feature to the top of `Cargo.toml`:
-
-```toml
-cargo-features = ["edition2024"]
-
-[package]
-name = "my-package"
-version = "0.1.0"
-edition = "2024"
-```
-
-If you want to transition an existing project from a previous edition, then
-`cargo fix --edition` can be used on the nightly channel. After running `cargo
-fix`, you can switch the edition to 2024 as illustrated above.
-
-This feature is very unstable, and is only intended for early testing and
-experimentation. Future nightly releases may introduce changes for the 2024
-edition that may break your build.
-
-[edition]: ../../edition-guide/index.html
-
 ## Profile `trim-paths` option
 
 * Tracking Issue: [rust-lang/cargo#12137](https://github.com/rust-lang/cargo/issues/12137)
@@ -2013,3 +1986,10 @@ default behavior.
 
 See the [build script documentation](build-scripts.md#rustc-check-cfg) for information
 about specifying custom cfgs.
+
+## Edition 2024
+
+The 2024 edition has been stabilized in the 1.85 release.
+See the [`edition` field](manifest.md#the-edition-field) for more information on setting the edition.
+See [`cargo fix --edition`](../commands/cargo-fix.md) and [The Edition Guide](../../edition-guide/index.html) for more information on migrating existing projects.
+