feat: Stabilize lints

Fixes rust-lang#12115

src/cargo/ops/cargo_new.rs

@@ -817,11 +817,10 @@ fn mk(config: &Config, opts: &MkOptions<'_>) -> CargoResult<()> {
             }
 
             // Try to inherit the workspace lints key if it exists.
-            if config.cli_unstable().lints
-                && workspace_document
-                    .get("workspace")
-                    .and_then(|workspace| workspace.get("lints"))
-                    .is_some()
+            if workspace_document
+                .get("workspace")
+                .and_then(|workspace| workspace.get("lints"))
+                .is_some()
             {
                 let mut table = toml_edit::Table::new();
                 table["workspace"] = toml_edit::value(true);

src/cargo/util/toml/mod.rs

@@ -339,7 +339,7 @@ pub struct TomlManifest {
     patch: Option<BTreeMap<String, BTreeMap<String, TomlDependency>>>,
     workspace: Option<TomlWorkspace>,
     badges: Option<MaybeWorkspaceBtreeMap>,
-    lints: Option<toml::Value>,
+    lints: Option<MaybeWorkspaceLints>,
 }
 
 #[derive(Deserialize, Serialize, Clone, Debug, Default)]
@@ -1456,7 +1456,7 @@ pub struct TomlWorkspace {
     // Properties that can be inherited by members.
     package: Option<InheritableFields>,
     dependencies: Option<BTreeMap<String, TomlDependency>>,
-    lints: Option<toml::Value>,
+    lints: Option<TomlLints>,
 
     // Note that this field must come last due to the way toml serialization
     // works which requires tables to be emitted after all values.
@@ -1882,7 +1882,7 @@ impl TomlManifest {
                 let mut inheritable = toml_config.package.clone().unwrap_or_default();
                 inheritable.update_ws_path(package_root.to_path_buf());
                 inheritable.update_deps(toml_config.dependencies.clone());
-                let lints = parse_unstable_lints(toml_config.lints.clone(), config, &mut warnings)?;
+                let lints = toml_config.lints.clone();
                 let lints = verify_lints(lints)?;
                 inheritable.update_lints(lints);
                 if let Some(ws_deps) = &inheritable.dependencies {
@@ -2143,10 +2143,11 @@ impl TomlManifest {
             &inherit_cell,
         )?;
 
-        let lints =
-            parse_unstable_lints::<MaybeWorkspaceLints>(me.lints.clone(), config, cx.warnings)?
-                .map(|mw| mw.resolve(|| inherit()?.lints()))
-                .transpose()?;
+        let lints = me
+            .lints
+            .clone()
+            .map(|mw| mw.resolve(|| inherit()?.lints()))
+            .transpose()?;
         let lints = verify_lints(lints)?;
         let default = TomlLints::default();
         let rustflags = lints_to_rustflags(lints.as_ref().unwrap_or(&default));
@@ -2447,7 +2448,10 @@ impl TomlManifest {
                 .badges
                 .as_ref()
                 .map(|_| MaybeWorkspace::Defined(metadata.badges.clone())),
-            lints: lints.map(|lints| toml::Value::try_from(lints).unwrap()),
+            lints: lints.map(|lints| MaybeWorkspaceLints {
+                workspace: false,
+                lints,
+            }),
         };
         let mut manifest = Manifest::new(
             summary,
@@ -2579,7 +2583,7 @@ impl TomlManifest {
                 let mut inheritable = toml_config.package.clone().unwrap_or_default();
                 inheritable.update_ws_path(root.to_path_buf());
                 inheritable.update_deps(toml_config.dependencies.clone());
-                let lints = parse_unstable_lints(toml_config.lints.clone(), config, &mut warnings)?;
+                let lints = toml_config.lints.clone();
                 let lints = verify_lints(lints)?;
                 inheritable.update_lints(lints);
                 let ws_root_config = WorkspaceRootConfig::new(
@@ -2726,55 +2730,6 @@ impl TomlManifest {
     }
 }
 
-fn parse_unstable_lints<T: Deserialize<'static>>(
-    lints: Option<toml::Value>,
-    config: &Config,
-    warnings: &mut Vec<String>,
-) -> CargoResult<Option<T>> {
-    let Some(lints) = lints else {
-        return Ok(None);
-    };
-
-    if !config.cli_unstable().lints {
-        warn_for_lint_feature(config, warnings);
-        return Ok(None);
-    }
-
-    lints.try_into().map(Some).map_err(|err| err.into())
-}
-
-fn warn_for_lint_feature(config: &Config, warnings: &mut Vec<String>) {
-    use std::fmt::Write as _;
-
-    let key_name = "lints";
-    let feature_name = "lints";
-
-    let mut message = String::new();
-
-    let _ = write!(
-        message,
-        "unused manifest key `{key_name}` (may be supported in a future version)"
-    );
-    if config.nightly_features_allowed {
-        let _ = write!(
-            message,
-            "
-
-consider passing `-Z{feature_name}` to enable this feature."
-        );
-    } else {
-        let _ = write!(
-            message,
-            "
-
-this Cargo does not support nightly features, but if you
-switch to nightly channel you can pass
-`-Z{feature_name}` to enable this feature.",
-        );
-    }
-    warnings.push(message);
-}
-
 fn verify_lints(lints: Option<TomlLints>) -> CargoResult<Option<TomlLints>> {
     let Some(lints) = lints else {
         return Ok(None);

src/doc/src/reference/manifest.md

@@ -46,6 +46,7 @@ Every manifest file consists of the following sections:
   * [`[dev-dependencies]`](specifying-dependencies.md#development-dependencies) --- Dependencies for examples, tests, and benchmarks.
   * [`[build-dependencies]`](specifying-dependencies.md#build-dependencies) --- Dependencies for build scripts.
   * [`[target]`](specifying-dependencies.md#platform-specific-dependencies) --- Platform-specific dependencies.
+* [`[lints]`](#the-lints-section) --- Configure linters for this package.
 * [`[badges]`](#the-badges-section) --- Badges to display on a registry.
 * [`[features]`](features.md) --- Conditional compilation features.
 * [`[patch]`](overriding-dependencies.md#the-patch-section) --- Override dependencies.
@@ -530,6 +531,46 @@ both `src/bin/a.rs` and `src/bin/b.rs`:
 default-run = "a"
 ```
 
+#### The `lints` section
+
+Override the default level of lints from different tools by assigning them to a new level in a
+table, for example:
+```toml
+[lints.rust]
+unsafe_code = "forbid"
+```
+
+This is short-hand for:
+```toml
+[lints.rust]
+unsafe_code = { level = "forbid", priority = 0 }
+```
+
+`level` corresponds to the lint levels in `rustc`:
+- `forbid`
+- `deny`
+- `warn`
+- `allow`
+
+`priority` is a signed integer that controls which lints or lint groups override other lint groups:
+- lower (particularly negative) numbers have lower priority, being overridden
+  by higher numbers, and show up first on the command-line to tools like
+  `rustc`
+
+To know which table under `[lints]` a particular lint belongs under, it is the part before `::` in the lint
+name.  If there isn't a `::`, then the tool is `rust`.  For example a warning
+about `unsafe_code` would be `lints.rust.unsafe_code` but a lint about
+`clippy::enum_glob_use` would be `lints.clippy.enum_glob_use`.
+
+For example:
+```toml
+[lints.rust]
+unsafe_code = "forbid"
+
+[lints.clippy]
+enum_glob_use = "deny"
+```
+
 ## The `[badges]` section
 
 The `[badges]` section is for specifying status badges that can be displayed

src/doc/src/reference/unstable.md

@@ -93,7 +93,6 @@ For the latest nightly, see the [nightly version] of this page.
     * [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.
-    * [`[lints]`](#lints) --- Configure lint levels for various linter tools.
 * Information and metadata
     * [Build-plan](#build-plan) --- Emits JSON information on which commands will be run.
     * [unit-graph](#unit-graph) --- Emits JSON for Cargo's internal graph structure.
@@ -1571,100 +1570,8 @@ Differences between `cargo run --manifest-path <path>` and `cargo <path>`
 - `cargo <path>` runs with the config for `<path>` and not the current dir, more like `cargo install --path <path>`
 - `cargo <path>` is at a verbosity level below the normal default.  Pass `-v` to get normal output.
 
-## `[lints]`
-
-* Tracking Issue: [#12115](https://github.com/rust-lang/cargo/issues/12115)
-
-A new `lints` table would be added to configure lints:
-```toml
-[lints.rust]
-unsafe = "forbid"
-```
-and `cargo` would pass these along as flags to `rustc`, `clippy`, or other lint tools when `-Zlints` is used.
-
-This would work with
-[RFC 2906 `workspace-deduplicate`](https://rust-lang.github.io/rfcs/2906-cargo-workspace-deduplicate.html):
-```toml
-[lints]
-workspace = true
-
-[workspace.lints.rust]
-unsafe = "forbid"
-```
-
 ### Documentation Updates
 
-#### The `lints` section
-
-*as a new ["Manifest Format" entry](./manifest.html#the-manifest-format)*
-
-Override the default level of lints from different tools by assigning them to a new level in a
-table, for example:
-```toml
-[lints.rust]
-unsafe = "forbid"
-```
-
-This is short-hand for:
-```toml
-[lints.rust]
-unsafe = { level = "forbid", priority = 0 }
-```
-
-`level` corresponds to the lint levels in `rustc`:
-- `forbid`
-- `deny`
-- `warn`
-- `allow`
-
-`priority` is a signed integer that controls which lints or lint groups override other lint groups:
-- lower (particularly negative) numbers have lower priority, being overridden
-  by higher numbers, and show up first on the command-line to tools like
-  `rustc`
-
-To know which table under `[lints]` a particular lint belongs under, it is the part before `::` in the lint
-name.  If there isn't a `::`, then the tool is `rust`.  For example a warning
-about `unsafe` would be `lints.rust.unsafe` but a lint about
-`clippy::enum_glob_use` would be `lints.clippy.enum_glob_use`.
-
-For example:
-```toml
-[lints.rust]
-unsafe = "forbid"
-
-[lints.clippy]
-enum_glob_use = "deny"
-```
-
-#### The `lints` table
-
-*as a new [`[workspace]` entry](./workspaces.html#the-workspace-section)*
-
-The `workspace.lints` table is where you define lint configuration to be inherited by members of a workspace.
-
-Specifying a workspace lint configuration is similar to package lints.
-
-Example:
-
-```toml
-# [PROJECT_DIR]/Cargo.toml
-[workspace]
-members = ["crates/*"]
-
-[workspace.lints.rust]
-unsafe = "forbid"
-```
-
-```toml
-# [PROJECT_DIR]/crates/bar/Cargo.toml
-[package]
-name = "bar"
-version = "0.1.0"
-
-[lints]
-workspace = true
-```
-
 # Stabilized and removed features
 
 ## Compile progress
@@ -1886,3 +1793,8 @@ for more information about the working directory for compiling and running tests
 The `--keep-going` option has been stabilized in the 1.74 release. See the
 [`--keep-going` flag](../commands/cargo-build.html#option-cargo-build---keep-going)
 in `cargo build` as an example for more details.
+
+## `[lints]`
+
+[`[lints]`](manifest.html#the-lints-section) (enabled via `-Zlints`) has been stabilized in the 1.74 release.
+

src/doc/src/reference/workspaces.md

@@ -24,6 +24,7 @@ In the `Cargo.toml`, the `[workspace]` table supports the following sections:
   * [`default-members`](#the-default-members-field) --- Packages to operate on when a specific package wasn't selected.
   * [`package`](#the-package-table) --- Keys for inheriting in packages.
   * [`dependencies`](#the-dependencies-table) --- Keys for inheriting in package dependencies.
+  * [`lints`](#the-lints-table) --- Keys for inheriting in package lints.
   * [`metadata`](#the-metadata-table) --- Extra settings for external tools.
 * [`[patch]`](overriding-dependencies.md#the-patch-section) --- Override dependencies.
 * [`[replace]`](overriding-dependencies.md#the-replace-section) --- Override dependencies (deprecated).
@@ -222,6 +223,33 @@ cc.workspace = true
 rand.workspace = true
 ```
 
+## The `lints` table
+
+The `workspace.lints` table is where you define lint configuration to be inherited by members of a workspace.
+
+Specifying a workspace lint configuration is similar to package lints.
+
+Example:
+
+```toml
+# [PROJECT_DIR]/Cargo.toml
+[workspace]
+members = ["crates/*"]
+
+[workspace.lints.rust]
+unsafe_code = "forbid"
+```
+
+```toml
+# [PROJECT_DIR]/crates/bar/Cargo.toml
+[package]
+name = "bar"
+version = "0.1.0"
+
+[lints]
+workspace = true
+```
+
 ## The `metadata` table
 
 The `workspace.metadata` table is ignored by Cargo and will not be warned

tests/testsuite/cargo_new/inherit_workspace_lints/mod.rs

@@ -1,7 +1,6 @@
 use cargo_test_support::compare::assert_ui;
 use cargo_test_support::curr_dir;
 use cargo_test_support::CargoCommand;
-use cargo_test_support::ChannelChanger;
 use cargo_test_support::Project;
 
 #[cargo_test]
@@ -12,9 +11,8 @@ fn case() {
 
     snapbox::cmd::Command::cargo_ui()
         .arg("new")
-        .args(["crates/foo", "-Zlints"])
+        .args(["crates/foo"])
         .current_dir(cwd)
-        .masquerade_as_nightly_cargo(&["lints"])
         .assert()
         .success()
         .stdout_matches_path(curr_dir!().join("stdout.log"))