Merging upstream version 1.75.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 287 insertions, 323 deletions

diff --git a/compiler/rustc_feature/Cargo.toml b/compiler/rustc_feature/Cargo.toml
index 6f6468646..9df320e12 100644
--- a/compiler/rustc_feature/Cargo.toml
+++ b/compiler/rustc_feature/Cargo.toml
@@ -3,8 +3,8 @@ name = "rustc_feature"
 version = "0.0.0"
 edition = "2021"
 
-[lib]
-
 [dependencies]
+# tidy-alphabetical-start
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_span = { path = "../rustc_span" }
+# tidy-alphabetical-end
diff --git a/compiler/rustc_feature/src/accepted.rs b/compiler/rustc_feature/src/accepted.rs
index bcc64d48d..577657ff7 100644
--- a/compiler/rustc_feature/src/accepted.rs
+++ b/compiler/rustc_feature/src/accepted.rs
@@ -1,23 +1,20 @@
 //! List of the accepted feature gates.
 
-use super::{to_nonzero, Feature, State};
+use super::{to_nonzero, Feature};
 use rustc_span::symbol::sym;
 
 macro_rules! declare_features {
     ($(
         $(#[doc = $doc:tt])* (accepted, $feature:ident, $ver:expr, $issue:expr, None),
     )+) => {
-        /// Those language feature has since been Accepted (it was once Active)
+        /// Formerly unstable features that have now been accepted (stabilized).
         pub const ACCEPTED_FEATURES: &[Feature] = &[
-            $(
-                Feature {
-                    state: State::Accepted,
-                    name: sym::$feature,
-                    since: $ver,
-                    issue: to_nonzero($issue),
-                    edition: None,
-                }
-            ),+
+            $(Feature {
+                name: sym::$feature,
+                since: $ver,
+                issue: to_nonzero($issue),
+                edition: None,
+            }),+
         ];
     }
 }
@@ -67,6 +64,8 @@ declare_features! (
     (accepted, associated_types, "1.0.0", None, None),
     /// Allows free and inherent `async fn`s, `async` blocks, and `<expr>.await` expressions.
     (accepted, async_await, "1.39.0", Some(50547), None),
+    /// Allows async functions to be declared, implemented, and used in traits.
+    (accepted, async_fn_in_trait, "1.75.0", Some(91611), None),
     /// Allows all literals in attribute lists and values of key-value pairs.
     (accepted, attr_literals, "1.30.0", Some(34981), None),
     /// Allows overloading augmented assignment operations like `a += b`.
@@ -306,6 +305,8 @@ declare_features! (
     (accepted, repr_packed, "1.33.0", Some(33158), None),
     /// Allows `#[repr(transparent)]` attribute on newtype structs.
     (accepted, repr_transparent, "1.28.0", Some(43036), None),
+    /// Allows return-position `impl Trait` in traits.
+    (accepted, return_position_impl_trait_in_trait, "1.75.0", Some(91611), None),
     /// Allows code like `let x: &'static u32 = &42` to work (RFC 1414).
     (accepted, rvalue_static_promotion, "1.21.0", Some(38865), None),
     /// Allows `Self` in type definitions (RFC 2300).
diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs
index 18397af56..214de3ca4 100644
--- a/compiler/rustc_feature/src/builtin_attrs.rs
+++ b/compiler/rustc_feature/src/builtin_attrs.rs
@@ -417,24 +417,6 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         naked_functions, experimental!(naked)
     ),
 
-    // Plugins:
-    BuiltinAttribute {
-        name: sym::plugin,
-        only_local: false,
-        type_: CrateLevel,
-        template: template!(List: "name"),
-        duplicates: DuplicatesOk,
-        gate: Gated(
-            Stability::Deprecated(
-                "https://github.com/rust-lang/rust/pull/64675",
-                Some("may be removed in a future compiler version"),
-            ),
-            sym::plugin,
-            "compiler plugins are deprecated",
-            cfg_fn!(plugin)
-        ),
-    },
-
     // Testing:
     gated!(
         test_runner, CrateLevel, template!(List: "path"), ErrorFollowing, custom_test_frameworks,
@@ -666,6 +648,10 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     rustc_attr!(
         rustc_do_not_const_check, Normal, template!(Word), WarnFollowing, INTERNAL_UNSTABLE
     ),
+    // Ensure the argument to this function is &&str during const-check.
+    rustc_attr!(
+        rustc_const_panic_str, Normal, template!(Word), WarnFollowing, INTERNAL_UNSTABLE
+    ),
 
     // ==========================================================================
     // Internal attributes, Layout related:
@@ -821,6 +807,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     rustc_attr!(TEST, rustc_strict_coherence, Normal, template!(Word), WarnFollowing),
     rustc_attr!(TEST, rustc_variance, Normal, template!(Word), WarnFollowing),
     rustc_attr!(TEST, rustc_variance_of_opaques, Normal, template!(Word), WarnFollowing),
+    rustc_attr!(TEST, rustc_hidden_type_of_opaques, Normal, template!(Word), WarnFollowing),
     rustc_attr!(TEST, rustc_layout, Normal, template!(List: "field1, field2, ..."), WarnFollowing),
     rustc_attr!(TEST, rustc_abi, Normal, template!(List: "field1, field2, ..."), WarnFollowing),
     rustc_attr!(TEST, rustc_regions, Normal, template!(Word), WarnFollowing),
diff --git a/compiler/rustc_feature/src/lib.rs b/compiler/rustc_feature/src/lib.rs
index 69e331159..070234df9 100644
--- a/compiler/rustc_feature/src/lib.rs
+++ b/compiler/rustc_feature/src/lib.rs
@@ -11,44 +11,26 @@
 //! even if it is stabilized or removed, *do not remove it*. Instead, move the
 //! symbol to the `accepted` or `removed` modules respectively.
 
+#![cfg_attr(not(bootstrap), allow(internal_features))]
+#![cfg_attr(not(bootstrap), feature(rustdoc_internals))]
+#![cfg_attr(not(bootstrap), doc(rust_logo))]
 #![feature(lazy_cell)]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
 
 mod accepted;
-mod active;
 mod builtin_attrs;
 mod removed;
+mod unstable;
 
 #[cfg(test)]
 mod tests;
 
-use rustc_span::{edition::Edition, symbol::Symbol, Span};
-use std::fmt;
+use rustc_span::{edition::Edition, symbol::Symbol};
 use std::num::NonZeroU32;
 
-#[derive(Clone, Copy)]
-pub enum State {
-    Accepted,
-    Active { set: fn(&mut Features, Span) },
-    Removed { reason: Option<&'static str> },
-    Stabilized { reason: Option<&'static str> },
-}
-
-impl fmt::Debug for State {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            State::Accepted { .. } => write!(f, "accepted"),
-            State::Active { .. } => write!(f, "active"),
-            State::Removed { .. } => write!(f, "removed"),
-            State::Stabilized { .. } => write!(f, "stabilized"),
-        }
-    }
-}
-
 #[derive(Debug, Clone)]
 pub struct Feature {
-    pub state: State,
     pub name: Symbol,
     pub since: &'static str,
     issue: Option<NonZeroU32>,
@@ -65,9 +47,9 @@ pub enum Stability {
 
 #[derive(Clone, Copy, Debug, Hash)]
 pub enum UnstableFeatures {
-    /// Hard errors for unstable features are active, as on beta/stable channels.
+    /// Disallow use of unstable features, as on beta/stable channels.
     Disallow,
-    /// Allow features to be activated, as on nightly.
+    /// Allow use of unstable features, as on nightly.
     Allow,
     /// Errors are bypassed for bootstrapping. This is required any time
     /// during the build that feature-related lints are set to warn or above
@@ -79,8 +61,8 @@ pub enum UnstableFeatures {
 impl UnstableFeatures {
     /// This takes into account `RUSTC_BOOTSTRAP`.
     ///
-    /// If `krate` is [`Some`], then setting `RUSTC_BOOTSTRAP=krate` will enable the nightly features.
-    /// Otherwise, only `RUSTC_BOOTSTRAP=1` will work.
+    /// If `krate` is [`Some`], then setting `RUSTC_BOOTSTRAP=krate` will enable the nightly
+    /// features. Otherwise, only `RUSTC_BOOTSTRAP=1` will work.
     pub fn from_environment(krate: Option<&str>) -> Self {
         // `true` if this is a feature-staged build, i.e., on the beta or stable channel.
         let disable_unstable_features =
@@ -107,20 +89,17 @@ impl UnstableFeatures {
 }
 
 fn find_lang_feature_issue(feature: Symbol) -> Option<NonZeroU32> {
-    if let Some(info) = ACTIVE_FEATURES.iter().find(|t| t.name == feature) {
-        info.issue
-    } else {
-        // search in Accepted, Removed, or Stable Removed features
-        let found = ACCEPTED_FEATURES
-            .iter()
-            .chain(REMOVED_FEATURES)
-            .chain(STABLE_REMOVED_FEATURES)
-            .find(|t| t.name == feature);
-        match found {
-            Some(found) => found.issue,
-            None => panic!("feature `{feature}` is not declared anywhere"),
-        }
+    // Search in all the feature lists.
+    if let Some(f) = UNSTABLE_FEATURES.iter().find(|f| f.feature.name == feature) {
+        return f.feature.issue;
+    }
+    if let Some(f) = ACCEPTED_FEATURES.iter().find(|f| f.name == feature) {
+        return f.issue;
+    }
+    if let Some(f) = REMOVED_FEATURES.iter().find(|f| f.feature.name == feature) {
+        return f.feature.issue;
     }
+    panic!("feature `{feature}` is not declared anywhere");
 }
 
 const fn to_nonzero(n: Option<u32>) -> Option<NonZeroU32> {
@@ -145,11 +124,11 @@ pub fn find_feature_issue(feature: Symbol, issue: GateIssue) -> Option<NonZeroU3
 }
 
 pub use accepted::ACCEPTED_FEATURES;
-pub use active::{Features, ACTIVE_FEATURES, INCOMPATIBLE_FEATURES};
 pub use builtin_attrs::AttributeDuplicates;
 pub use builtin_attrs::{
     deprecated_attributes, find_gated_cfg, is_builtin_attr_name, is_builtin_only_local,
     is_valid_for_get_attr, AttributeGate, AttributeTemplate, AttributeType, BuiltinAttribute,
     GatedCfg, BUILTIN_ATTRIBUTES, BUILTIN_ATTRIBUTE_MAP,
 };
-pub use removed::{REMOVED_FEATURES, STABLE_REMOVED_FEATURES};
+pub use removed::REMOVED_FEATURES;
+pub use unstable::{Features, INCOMPATIBLE_FEATURES, UNSTABLE_FEATURES};
diff --git a/compiler/rustc_feature/src/removed.rs b/compiler/rustc_feature/src/removed.rs
index 699d8a34e..4385e745b 100644
--- a/compiler/rustc_feature/src/removed.rs
+++ b/compiler/rustc_feature/src/removed.rs
@@ -1,40 +1,28 @@
 //! List of the removed feature gates.
 
-use super::{to_nonzero, Feature, State};
+use super::{to_nonzero, Feature};
 use rustc_span::symbol::sym;
 
+pub struct RemovedFeature {
+    pub feature: Feature,
+    pub reason: Option<&'static str>,
+}
+
 macro_rules! declare_features {
     ($(
         $(#[doc = $doc:tt])* (removed, $feature:ident, $ver:expr, $issue:expr, None, $reason:expr),
     )+) => {
-        /// Represents unstable features which have since been removed (it was once Active)
-        pub const REMOVED_FEATURES: &[Feature] = &[
-            $(
-                Feature {
-                    state: State::Removed { reason: $reason },
+        /// Formerly unstable features that have now been removed.
+        pub const REMOVED_FEATURES: &[RemovedFeature] = &[
+            $(RemovedFeature {
+                feature: Feature {
                     name: sym::$feature,
                     since: $ver,
                     issue: to_nonzero($issue),
                     edition: None,
-                }
-            ),+
-        ];
-    };
-
-    ($(
-        $(#[doc = $doc:tt])* (stable_removed, $feature:ident, $ver:expr, $issue:expr, None),
-    )+) => {
-        /// Represents stable features which have since been removed (it was once Accepted)
-        pub const STABLE_REMOVED_FEATURES: &[Feature] = &[
-            $(
-                Feature {
-                    state: State::Stabilized { reason: None },
-                    name: sym::$feature,
-                    since: $ver,
-                    issue: to_nonzero($issue),
-                    edition: None,
-                }
-            ),+
+                },
+                reason: $reason
+            }),+
         ];
     };
 }
@@ -54,7 +42,7 @@ declare_features! (
      Some("subsumed by `.await` syntax")),
     /// Allows using the `box $expr` syntax.
     (removed, box_syntax, "1.70.0", Some(49733), None, Some("replaced with `#[rustc_box]`")),
-    /// Allows capturing disjoint fields in a closure/generator (RFC 2229).
+    /// Allows capturing disjoint fields in a closure/coroutine (RFC 2229).
     (removed, capture_disjoint_fields, "1.49.0", Some(53488), None, Some("stabilized in Rust 2021")),
     /// Allows comparing raw pointers during const eval.
     (removed, const_compare_raw_pointers, "1.46.0", Some(53020), None,
@@ -108,6 +96,10 @@ declare_features! (
     /// Allows `#[doc(include = "some-file")]`.
     (removed, external_doc, "1.54.0", Some(44732), None,
      Some("use #[doc = include_str!(\"filename\")] instead, which handles macro invocations")),
+    /// Allows generators to be cloned.
+    (removed, generator_clone, "1.65.0", Some(95360), None, Some("renamed to `coroutine_clone`")),
+    /// Allows defining generators.
+    (removed, generators, "1.21.0", Some(43122), None, Some("renamed to `coroutines`")),
     /// Allows `impl Trait` in bindings (`let`, `const`, `static`).
     (removed, impl_trait_in_bindings, "1.55.0", Some(63065), None,
      Some("the implementation was not maintainable, the feature may get reintroduced once the current refactorings are done")),
@@ -141,6 +133,11 @@ declare_features! (
     (removed, no_coverage, "1.74.0", Some(84605), None, Some("renamed to `coverage_attribute`")),
     /// Allows `#[no_debug]`.
     (removed, no_debug, "1.43.0", Some(29721), None, Some("removed due to lack of demand")),
+    /// Note: this feature was previously recorded in a separate
+    /// `STABLE_REMOVED` list because it, uniquely, was once stable but was
+    /// then removed. But there was no utility storing it separately, so now
+    /// it's in this list.
+    (removed, no_stack_check, "1.0.0", None, None, None),
     /// Allows using `#[on_unimplemented(..)]` on traits.
     /// (Moved to `rustc_attrs`.)
     (removed, on_unimplemented, "1.40.0", None, None, None),
@@ -155,9 +152,12 @@ declare_features! (
      Some("removed in favor of `#![feature(marker_trait_attr)]`")),
     (removed, panic_implementation, "1.28.0", Some(44489), None,
      Some("subsumed by `#[panic_handler]`")),
+    /// Allows using `#![plugin(myplugin)]`.
+    (removed, plugin, "1.75.0", Some(29597), None,
+     Some("plugins are no longer supported")),
     /// Allows using `#[plugin_registrar]` on functions.
     (removed, plugin_registrar, "1.54.0", Some(29597), None,
-     Some("a __rustc_plugin_registrar symbol must now be defined instead")),
+     Some("plugins are no longer supported")),
     (removed, proc_macro_expr, "1.27.0", Some(54727), None,
      Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
     (removed, proc_macro_gen, "1.27.0", Some(54727), None,
@@ -208,8 +208,3 @@ declare_features! (
     // feature-group-end: removed features
     // -------------------------------------------------------------------------
 );
-
-#[rustfmt::skip]
-declare_features! (
-    (stable_removed, no_stack_check, "1.0.0", None, None),
-);
diff --git a/compiler/rustc_feature/src/active.rs b/compiler/rustc_feature/src/unstable.rs
index 783f39fdf..b11b190bd 100644
--- a/compiler/rustc_feature/src/active.rs
+++ b/compiler/rustc_feature/src/unstable.rs
@@ -1,19 +1,15 @@
-//! List of the active feature gates.
+//! List of the unstable feature gates.
 
-use super::{to_nonzero, Feature, State};
+use super::{to_nonzero, Feature};
 
 use rustc_data_structures::fx::FxHashSet;
 use rustc_span::edition::Edition;
 use rustc_span::symbol::{sym, Symbol};
 use rustc_span::Span;
 
-macro_rules! set {
-    ($field: ident) => {{
-        fn f(features: &mut Features, _: Span) {
-            features.$field = true;
-        }
-        f as fn(&mut Features, Span)
-    }};
+pub struct UnstableFeature {
+    pub feature: Feature,
+    pub set_enabled: fn(&mut Features),
 }
 
 #[derive(PartialEq)]
@@ -23,33 +19,36 @@ enum FeatureStatus {
     Internal,
 }
 
-macro_rules! declare_features {
-    (__status_to_enum active) => {
+macro_rules! status_to_enum {
+    (unstable) => {
         FeatureStatus::Default
     };
-    (__status_to_enum incomplete) => {
+    (incomplete) => {
         FeatureStatus::Incomplete
     };
-    (__status_to_enum internal) => {
+    (internal) => {
         FeatureStatus::Internal
     };
+}
+
+macro_rules! declare_features {
     ($(
         $(#[doc = $doc:tt])* ($status:ident, $feature:ident, $ver:expr, $issue:expr, $edition:expr),
     )+) => {
-        /// Represents active features that are currently being implemented or
-        /// currently being considered for addition/removal.
-        pub const ACTIVE_FEATURES:
-            &[Feature] =
-            &[$(
-                // (sym::$feature, $ver, $issue, $edition, set!($feature))
-                Feature {
-                    state: State::Active { set: set!($feature) },
+        /// Unstable language features that are being implemented or being
+        /// considered for acceptance (stabilization) or removal.
+        pub const UNSTABLE_FEATURES: &[UnstableFeature] = &[
+            $(UnstableFeature {
+                feature: Feature {
                     name: sym::$feature,
                     since: $ver,
                     issue: to_nonzero($issue),
                     edition: $edition,
-                }
-            ),+];
+                },
+                // Sets this feature's corresponding bool within `features`.
+                set_enabled: |features| features.$feature = true,
+            }),+
+        ];
 
         /// A set of features to be used by later passes.
         #[derive(Clone, Default, Debug)]
@@ -58,8 +57,9 @@ macro_rules! declare_features {
             pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>,
             /// `#![feature]` attrs for non-language (library) features.
             pub declared_lib_features: Vec<(Symbol, Span)>,
-            /// Features enabled for this crate.
-            pub active_features: FxHashSet<Symbol>,
+            /// `declared_lang_features` + `declared_lib_features`.
+            pub declared_features: FxHashSet<Symbol>,
+            /// Active state of individual features (unstable only).
             $(
                 $(#[doc = $doc])*
                 pub $feature: bool
@@ -67,19 +67,36 @@ macro_rules! declare_features {
         }
 
         impl Features {
+            pub fn set_declared_lang_feature(
+                &mut self,
+                symbol: Symbol,
+                span: Span,
+                since: Option<Symbol>
+            ) {
+                self.declared_lang_features.push((symbol, span, since));
+                self.declared_features.insert(symbol);
+            }
+
+            pub fn set_declared_lib_feature(&mut self, symbol: Symbol, span: Span) {
+                self.declared_lib_features.push((symbol, span));
+                self.declared_features.insert(symbol);
+            }
+
             pub fn walk_feature_fields(&self, mut f: impl FnMut(&str, bool)) {
                 $(f(stringify!($feature), self.$feature);)+
             }
 
-            /// Is the given feature active?
-            pub fn active(&self, feature: Symbol) -> bool {
-                self.active_features.contains(&feature)
+            /// Is the given feature explicitly declared, i.e. named in a
+            /// `#![feature(...)]` within the code?
+            pub fn declared(&self, feature: Symbol) -> bool {
+                self.declared_features.contains(&feature)
             }
 
-            /// Is the given feature enabled?
+            /// Is the given feature active, i.e. declared or automatically
+            /// enabled due to the edition?
             ///
             /// Panics if the symbol doesn't correspond to a declared feature.
-            pub fn enabled(&self, feature: Symbol) -> bool {
+            pub fn active(&self, feature: Symbol) -> bool {
                 match feature {
                     $( sym::$feature => self.$feature, )*
 
@@ -93,27 +110,24 @@ macro_rules! declare_features {
             pub fn incomplete(&self, feature: Symbol) -> bool {
                 match feature {
                     $(
-                        sym::$feature => declare_features!(__status_to_enum $status) == FeatureStatus::Incomplete,
+                        sym::$feature => status_to_enum!($status) == FeatureStatus::Incomplete,
                     )*
-                    // accepted and removed features aren't in this file but are never incomplete
-                    _ if self.declared_lang_features.iter().any(|f| f.0 == feature) => false,
-                    _ if self.declared_lib_features.iter().any(|f| f.0 == feature) => false,
+                    // Accepted/removed features aren't in this file but are never incomplete.
+                    _ if self.declared_features.contains(&feature) => false,
                     _ => panic!("`{}` was not listed in `declare_features`", feature),
                 }
             }
 
             /// Some features are internal to the compiler and standard library and should not
-            /// be used in normal projects. We warn the user about these
-            /// to alert them.
+            /// be used in normal projects. We warn the user about these to alert them.
             pub fn internal(&self, feature: Symbol) -> bool {
                 match feature {
                     $(
-                        sym::$feature => declare_features!(__status_to_enum $status) == FeatureStatus::Internal,
+                        sym::$feature => status_to_enum!($status) == FeatureStatus::Internal,
                     )*
-                    // accepted and removed features aren't in this file but are never internal
-                    // (a removed feature might have been internal, but it doesn't matter anymore)
-                    _ if self.declared_lang_features.iter().any(|f| f.0 == feature) => false,
-                    _ if self.declared_lib_features.iter().any(|f| f.0 == feature) => false,
+                    // Accepted/removed features aren't in this file but are never internal
+                    // (a removed feature might have been internal, but that's now irrelevant).
+                    _ if self.declared_features.contains(&feature) => false,
                     _ => panic!("`{}` was not listed in `declare_features`", feature),
                 }
             }
@@ -121,16 +135,6 @@ macro_rules! declare_features {
     };
 }
 
-impl Feature {
-    /// Sets this feature in `Features`. Panics if called on a non-active feature.
-    pub fn set(&self, features: &mut Features, span: Span) {
-        match self.state {
-            State::Active { set } => set(features, span),
-            _ => panic!("called `set` on feature `{}` which is not `active`", self.name),
-        }
-    }
-}
-
 // See https://rustc-dev-guide.rust-lang.org/feature-gates.html#feature-gates for more
 // documentation about handling feature gates.
 //
@@ -140,8 +144,7 @@ impl Feature {
 // accepted or `removed.rs` if removed.
 //
 // The version numbers here correspond to the version in which the current status
-// was set. This is most important for knowing when a particular feature became
-// stable (active).
+// was set.
 //
 // Note that the features are grouped into internal/user-facing and then
 // sorted by version inside those groups. This is enforced with tidy.
@@ -157,9 +160,9 @@ declare_features! (
     // no-tracking-issue-start
 
     /// Allows using the `unadjusted` ABI; perma-unstable.
-    (active, abi_unadjusted, "1.16.0", None, None),
+    (unstable, abi_unadjusted, "1.16.0", None, None),
     /// Allows using the `vectorcall` ABI.
-    (active, abi_vectorcall, "1.7.0", None, None),
+    (unstable, abi_vectorcall, "1.7.0", None, None),
     /// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`.
     (internal, allocator_internals, "1.20.0", None, None),
     /// Allows using `#[allow_internal_unsafe]`. This is an
@@ -173,21 +176,21 @@ declare_features! (
     /// macros disappear).
     (internal, allow_internal_unstable, "1.0.0", None, None),
     /// Allows using anonymous lifetimes in argument-position impl-trait.
-    (active, anonymous_lifetime_in_impl_trait, "1.63.0", None, None),
+    (unstable, anonymous_lifetime_in_impl_trait, "1.63.0", None, None),
     /// Allows identifying the `compiler_builtins` crate.
     (internal, compiler_builtins, "1.13.0", None, None),
     /// Allows writing custom MIR
     (internal, custom_mir, "1.65.0", None, None),
     /// Outputs useful `assert!` messages
-    (active, generic_assert, "1.63.0", None, None),
+    (unstable, generic_assert, "1.63.0", None, None),
     /// Allows using the `rust-intrinsic`'s "ABI".
     (internal, intrinsics, "1.0.0", None, None),
     /// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic.
     (internal, lang_items, "1.0.0", None, None),
     /// Allows `#[link(..., cfg(..))]`; perma-unstable per #37406
-    (active, link_cfg, "1.14.0", None, None),
+    (unstable, link_cfg, "1.14.0", None, None),
     /// Allows the `multiple_supertrait_upcastable` lint.
-    (active, multiple_supertrait_upcastable, "1.69.0", None, None),
+    (unstable, multiple_supertrait_upcastable, "1.69.0", None, None),
     /// Allow negative trait bounds. This is an internal-only feature for testing the trait solver!
     (incomplete, negative_bounds, "1.71.0", None, None),
     /// Allows using `#[omit_gdb_pretty_printer_section]`.
@@ -209,7 +212,7 @@ declare_features! (
     (internal, unsafe_pin_internals, "1.60.0", None, None),
     /// Use for stable + negative coherence and strict coherence depending on trait's
     /// rustc_strict_coherence value.
-    (active, with_negative_coherence, "1.60.0", None, None),
+    (unstable, with_negative_coherence, "1.60.0", None, None),
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
     // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
@@ -225,20 +228,20 @@ declare_features! (
 
     /// Allows features specific to auto traits.
     /// Renamed from `optin_builtin_traits`.
-    (active, auto_traits, "1.50.0", Some(13231), None),
+    (unstable, auto_traits, "1.50.0", Some(13231), None),
     /// Allows using `box` in patterns (RFC 469).
-    (active, box_patterns, "1.0.0", Some(29641), None),
+    (unstable, box_patterns, "1.0.0", Some(29641), None),
     /// Allows `#[doc(notable_trait)]`.
     /// Renamed from `doc_spotlight`.
-    (active, doc_notable_trait, "1.52.0", Some(45040), None),
+    (unstable, doc_notable_trait, "1.52.0", Some(45040), None),
     /// Allows using the `may_dangle` attribute (RFC 1327).
-    (active, dropck_eyepatch, "1.10.0", Some(34761), None),
+    (unstable, dropck_eyepatch, "1.10.0", Some(34761), None),
     /// Allows using the `#[fundamental]` attribute.
-    (active, fundamental, "1.0.0", Some(29635), None),
+    (unstable, fundamental, "1.0.0", Some(29635), None),
     /// Allows using `#[link_name="llvm.*"]`.
     (internal, link_llvm_intrinsics, "1.0.0", Some(29602), None),
     /// Allows using the `#[linkage = ".."]` attribute.
-    (active, linkage, "1.0.0", Some(29603), None),
+    (unstable, linkage, "1.0.0", Some(29603), None),
     /// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed.
     (internal, needs_panic_runtime, "1.10.0", Some(32837), None),
     /// Allows using the `#![panic_runtime]` attribute.
@@ -250,19 +253,19 @@ declare_features! (
     /// purpose as `#[allow_internal_unstable]`.
     (internal, rustc_allow_const_fn_unstable, "1.49.0", Some(69399), None),
     /// Allows using compiler's own crates.
-    (active, rustc_private, "1.0.0", Some(27812), None),
+    (unstable, rustc_private, "1.0.0", Some(27812), None),
     /// Allows using internal rustdoc features like `doc(keyword)`.
     (internal, rustdoc_internals, "1.58.0", Some(90418), None),
     /// Allows using the `rustdoc::missing_doc_code_examples` lint
-    (active, rustdoc_missing_doc_code_examples, "1.31.0", Some(101730), None),
+    (unstable, rustdoc_missing_doc_code_examples, "1.31.0", Some(101730), None),
     /// Allows using `#[start]` on a function indicating that it is the program entrypoint.
-    (active, start, "1.0.0", Some(29633), None),
+    (unstable, start, "1.0.0", Some(29633), None),
     /// Allows using `#[structural_match]` which indicates that a type is structurally matchable.
     /// FIXME: Subsumed by trait `StructuralPartialEq`, cannot move to removed until a library
     /// feature with the same name exists.
-    (active, structural_match, "1.8.0", Some(31434), None),
+    (unstable, structural_match, "1.8.0", Some(31434), None),
     /// Allows using the `rust-call` ABI.
-    (active, unboxed_closures, "1.0.0", Some(29625), None),
+    (unstable, unboxed_closures, "1.0.0", Some(29625), None),
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
     // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
@@ -278,20 +281,21 @@ declare_features! (
     // FIXME: Document these and merge with the list below.
 
     // Unstable `#[target_feature]` directives.
-    (active, aarch64_ver_target_feature, "1.27.0", Some(44839), None),
-    (active, arm_target_feature, "1.27.0", Some(44839), None),
-    (active, avx512_target_feature, "1.27.0", Some(44839), None),
-    (active, bpf_target_feature, "1.54.0", Some(44839), None),
-    (active, csky_target_feature, "1.73.0", Some(44839), None),
-    (active, ermsb_target_feature, "1.49.0", Some(44839), None),
-    (active, hexagon_target_feature, "1.27.0", Some(44839), None),
-    (active, mips_target_feature, "1.27.0", Some(44839), None),
-    (active, powerpc_target_feature, "1.27.0", Some(44839), None),
-    (active, riscv_target_feature, "1.45.0", Some(44839), None),
-    (active, rtm_target_feature, "1.35.0", Some(44839), None),
-    (active, sse4a_target_feature, "1.27.0", Some(44839), None),
-    (active, tbm_target_feature, "1.27.0", Some(44839), None),
-    (active, wasm_target_feature, "1.30.0", Some(44839), None),
+    (unstable, aarch64_ver_target_feature, "1.27.0", Some(44839), None),
+    (unstable, arm_target_feature, "1.27.0", Some(44839), None),
+    (unstable, avx512_target_feature, "1.27.0", Some(44839), None),
+    (unstable, bpf_target_feature, "1.54.0", Some(44839), None),
+    (unstable, csky_target_feature, "1.73.0", Some(44839), None),
+    (unstable, ermsb_target_feature, "1.49.0", Some(44839), None),
+    (unstable, hexagon_target_feature, "1.27.0", Some(44839), None),
+    (unstable, loongarch_target_feature, "1.73.0", Some(44839), None),
+    (unstable, mips_target_feature, "1.27.0", Some(44839), None),
+    (unstable, powerpc_target_feature, "1.27.0", Some(44839), None),
+    (unstable, riscv_target_feature, "1.45.0", Some(44839), None),
+    (unstable, rtm_target_feature, "1.35.0", Some(44839), None),
+    (unstable, sse4a_target_feature, "1.27.0", Some(44839), None),
+    (unstable, tbm_target_feature, "1.27.0", Some(44839), None),
+    (unstable, wasm_target_feature, "1.30.0", Some(44839), None),
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
     // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
@@ -305,157 +309,157 @@ declare_features! (
     // -------------------------------------------------------------------------
 
     /// Allows using the `amdgpu-kernel` ABI.
-    (active, abi_amdgpu_kernel, "1.29.0", Some(51575), None),
+    (unstable, abi_amdgpu_kernel, "1.29.0", Some(51575), None),
     /// Allows `extern "avr-interrupt" fn()` and `extern "avr-non-blocking-interrupt" fn()`.
-    (active, abi_avr_interrupt, "1.45.0", Some(69664), None),
+    (unstable, abi_avr_interrupt, "1.45.0", Some(69664), None),
     /// Allows `extern "C-cmse-nonsecure-call" fn()`.
-    (active, abi_c_cmse_nonsecure_call, "1.51.0", Some(81391), None),
+    (unstable, abi_c_cmse_nonsecure_call, "1.51.0", Some(81391), None),
     /// Allows `extern "msp430-interrupt" fn()`.
-    (active, abi_msp430_interrupt, "1.16.0", Some(38487), None),
+    (unstable, abi_msp430_interrupt, "1.16.0", Some(38487), None),
     /// Allows `extern "ptx-*" fn()`.
-    (active, abi_ptx, "1.15.0", Some(38788), None),
+    (unstable, abi_ptx, "1.15.0", Some(38788), None),
     /// Allows `extern "riscv-interrupt-m" fn()` and `extern "riscv-interrupt-s" fn()`.
-    (active, abi_riscv_interrupt, "1.73.0", Some(111889), None),
+    (unstable, abi_riscv_interrupt, "1.73.0", Some(111889), None),
     /// Allows `extern "x86-interrupt" fn()`.
-    (active, abi_x86_interrupt, "1.17.0", Some(40180), None),
+    (unstable, abi_x86_interrupt, "1.17.0", Some(40180), None),
     /// Allows additional const parameter types, such as `&'static str` or user defined types
     (incomplete, adt_const_params, "1.56.0", Some(95174), None),
     /// Allows defining an `#[alloc_error_handler]`.
-    (active, alloc_error_handler, "1.29.0", Some(51540), None),
+    (unstable, alloc_error_handler, "1.29.0", Some(51540), None),
     /// Allows trait methods with arbitrary self types.
-    (active, arbitrary_self_types, "1.23.0", Some(44874), None),
+    (unstable, arbitrary_self_types, "1.23.0", Some(44874), None),
     /// Allows using `const` operands in inline assembly.
-    (active, asm_const, "1.58.0", Some(93332), None),
+    (unstable, asm_const, "1.58.0", Some(93332), None),
     /// Enables experimental inline assembly support for additional architectures.
-    (active, asm_experimental_arch, "1.58.0", Some(93335), None),
+    (unstable, asm_experimental_arch, "1.58.0", Some(93335), None),
     /// Allows the `may_unwind` option in inline assembly.
-    (active, asm_unwind, "1.58.0", Some(93334), None),
+    (unstable, asm_unwind, "1.58.0", Some(93334), None),
     /// Allows users to enforce equality of associated constants `TraitImpl<AssocConst=3>`.
-    (active, associated_const_equality, "1.58.0", Some(92827), None),
+    (unstable, associated_const_equality, "1.58.0", Some(92827), None),
     /// Allows the user of associated type bounds.
-    (active, associated_type_bounds, "1.34.0", Some(52662), None),
+    (unstable, associated_type_bounds, "1.34.0", Some(52662), None),
     /// Allows associated type defaults.
-    (active, associated_type_defaults, "1.2.0", Some(29661), None),
+    (unstable, associated_type_defaults, "1.2.0", Some(29661), None),
     /// Allows `async || body` closures.
-    (active, async_closure, "1.37.0", Some(62290), None),
-    /// Allows async functions to be declared, implemented, and used in traits.
-    (active, async_fn_in_trait, "1.66.0", Some(91611), None),
+    (unstable, async_closure, "1.37.0", Some(62290), None),
     /// Allows `#[track_caller]` on async functions.
-    (active, async_fn_track_caller, "1.73.0", Some(110011), None),
+    (unstable, async_fn_track_caller, "1.73.0", Some(110011), None),
     /// Allows builtin # foo() syntax
-    (active, builtin_syntax, "1.71.0", Some(110680), None),
+    (unstable, builtin_syntax, "1.71.0", Some(110680), None),
     /// Allows `c"foo"` literals.
-    (active, c_str_literals, "1.71.0", Some(105723), None),
+    (unstable, c_str_literals, "1.71.0", Some(105723), None),
     /// Treat `extern "C"` function as nounwind.
-    (active, c_unwind, "1.52.0", Some(74990), None),
+    (unstable, c_unwind, "1.52.0", Some(74990), None),
     /// Allows using C-variadics.
-    (active, c_variadic, "1.34.0", Some(44930), None),
+    (unstable, c_variadic, "1.34.0", Some(44930), None),
     /// Allows the use of `#[cfg(overflow_checks)` to check if integer overflow behaviour.
-    (active, cfg_overflow_checks, "1.71.0", Some(111466), None),
+    (unstable, cfg_overflow_checks, "1.71.0", Some(111466), None),
     /// Provides the relocation model information as cfg entry
-    (active, cfg_relocation_model, "1.73.0", Some(114929), None),
+    (unstable, cfg_relocation_model, "1.73.0", Some(114929), None),
     /// Allows the use of `#[cfg(sanitize = "option")]`; set when -Zsanitizer is used.
-    (active, cfg_sanitize, "1.41.0", Some(39699), None),
+    (unstable, cfg_sanitize, "1.41.0", Some(39699), None),
     /// Allows `cfg(target_abi = "...")`.
-    (active, cfg_target_abi, "1.55.0", Some(80970), None),
+    (unstable, cfg_target_abi, "1.55.0", Some(80970), None),
     /// Allows `cfg(target(abi = "..."))`.
-    (active, cfg_target_compact, "1.63.0", Some(96901), None),
+    (unstable, cfg_target_compact, "1.63.0", Some(96901), None),
     /// Allows `cfg(target_has_atomic_load_store = "...")`.
-    (active, cfg_target_has_atomic, "1.60.0", Some(94039), None),
+    (unstable, cfg_target_has_atomic, "1.60.0", Some(94039), None),
     /// Allows `cfg(target_has_atomic_equal_alignment = "...")`.
-    (active, cfg_target_has_atomic_equal_alignment, "1.60.0", Some(93822), None),
+    (unstable, cfg_target_has_atomic_equal_alignment, "1.60.0", Some(93822), None),
     /// Allows `cfg(target_thread_local)`.
-    (active, cfg_target_thread_local, "1.7.0", Some(29594), None),
+    (unstable, cfg_target_thread_local, "1.7.0", Some(29594), None),
     /// Allow conditional compilation depending on rust version
-    (active, cfg_version, "1.45.0", Some(64796), None),
+    (unstable, cfg_version, "1.45.0", Some(64796), None),
     /// Allows to use the `#[cfi_encoding = ""]` attribute.
-    (active, cfi_encoding, "1.71.0", Some(89653), None),
-    /// Allows `for<...>` on closures and generators.
-    (active, closure_lifetime_binder, "1.64.0", Some(97362), None),
-    /// Allows `#[track_caller]` on closures and generators.
-    (active, closure_track_caller, "1.57.0", Some(87417), None),
+    (unstable, cfi_encoding, "1.71.0", Some(89653), None),
+    /// Allows `for<...>` on closures and coroutines.
+    (unstable, closure_lifetime_binder, "1.64.0", Some(97362), None),
+    /// Allows `#[track_caller]` on closures and coroutines.
+    (unstable, closure_track_caller, "1.57.0", Some(87417), None),
     /// Allows to use the `#[cmse_nonsecure_entry]` attribute.
-    (active, cmse_nonsecure_entry, "1.48.0", Some(75835), None),
+    (unstable, cmse_nonsecure_entry, "1.48.0", Some(75835), None),
     /// Allows use of the `#[collapse_debuginfo]` attribute.
-    (active, collapse_debuginfo, "1.65.0", Some(100758), None),
+    (unstable, collapse_debuginfo, "1.65.0", Some(100758), None),
     /// Allows `async {}` expressions in const contexts.
-    (active, const_async_blocks, "1.53.0", Some(85368), None),
+    (unstable, const_async_blocks, "1.53.0", Some(85368), None),
     /// Allows `const || {}` closures in const contexts.
     (incomplete, const_closures, "1.68.0", Some(106003), None),
     /// Allows the definition of `const extern fn` and `const unsafe extern fn`.
-    (active, const_extern_fn, "1.40.0", Some(64926), None),
+    (unstable, const_extern_fn, "1.40.0", Some(64926), None),
     /// Allows basic arithmetic on floating point types in a `const fn`.
-    (active, const_fn_floating_point_arithmetic, "1.48.0", Some(57241), None),
+    (unstable, const_fn_floating_point_arithmetic, "1.48.0", Some(57241), None),
     /// Allows `for _ in _` loops in const contexts.
-    (active, const_for, "1.56.0", Some(87575), None),
+    (unstable, const_for, "1.56.0", Some(87575), None),
     /// Allows using `&mut` in constant functions.
-    (active, const_mut_refs, "1.41.0", Some(57349), None),
+    (unstable, const_mut_refs, "1.41.0", Some(57349), None),
     /// Be more precise when looking for live drops in a const context.
-    (active, const_precise_live_drops, "1.46.0", Some(73255), None),
+    (unstable, const_precise_live_drops, "1.46.0", Some(73255), None),
     /// Allows references to types with interior mutability within constants
-    (active, const_refs_to_cell, "1.51.0", Some(80384), None),
+    (unstable, const_refs_to_cell, "1.51.0", Some(80384), None),
     /// Allows `impl const Trait for T` syntax.
-    (active, const_trait_impl, "1.42.0", Some(67792), None),
+    (unstable, const_trait_impl, "1.42.0", Some(67792), None),
     /// Allows the `?` operator in const contexts.
-    (active, const_try, "1.56.0", Some(74935), None),
+    (unstable, const_try, "1.56.0", Some(74935), None),
+    /// Allows coroutines to be cloned.
+    (unstable, coroutine_clone, "1.65.0", Some(95360), None),
+    /// Allows defining coroutines.
+    (unstable, coroutines, "1.21.0", Some(43122), None),
     /// Allows function attribute `#[coverage(on/off)]`, to control coverage
     /// instrumentation of that function.
-    (active, coverage_attribute, "1.74.0", Some(84605), None),
+    (unstable, coverage_attribute, "1.74.0", Some(84605), None),
     /// Allows users to provide classes for fenced code block using `class:classname`.
-    (active, custom_code_classes_in_docs, "1.74.0", Some(79483), None),
+    (unstable, custom_code_classes_in_docs, "1.74.0", Some(79483), None),
     /// Allows non-builtin attributes in inner attribute position.
-    (active, custom_inner_attributes, "1.30.0", Some(54726), None),
+    (unstable, custom_inner_attributes, "1.30.0", Some(54726), None),
     /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.
-    (active, custom_test_frameworks, "1.30.0", Some(50297), None),
+    (unstable, custom_test_frameworks, "1.30.0", Some(50297), None),
     /// Allows declarative macros 2.0 (`macro`).
-    (active, decl_macro, "1.17.0", Some(39412), None),
+    (unstable, decl_macro, "1.17.0", Some(39412), None),
     /// Allows default type parameters to influence type inference.
-    (active, default_type_parameter_fallback, "1.3.0", Some(27336), None),
+    (unstable, default_type_parameter_fallback, "1.3.0", Some(27336), None),
     /// Allows using `#[deprecated_safe]` to deprecate the safeness of a function or trait
-    (active, deprecated_safe, "1.61.0", Some(94978), None),
+    (unstable, deprecated_safe, "1.61.0", Some(94978), None),
     /// Allows having using `suggestion` in the `#[deprecated]` attribute.
-    (active, deprecated_suggestion, "1.61.0", Some(94785), None),
+    (unstable, deprecated_suggestion, "1.61.0", Some(94785), None),
     /// Allows using the `#[diagnostic]` attribute tool namespace
-    (active, diagnostic_namespace, "1.73.0", Some(111996), None),
+    (unstable, diagnostic_namespace, "1.73.0", Some(111996), None),
     /// Controls errors in trait implementations.
-    (active, do_not_recommend, "1.67.0", Some(51992), None),
+    (unstable, do_not_recommend, "1.67.0", Some(51992), None),
     /// Tells rustdoc to automatically generate `#[doc(cfg(...))]`.
-    (active, doc_auto_cfg, "1.58.0", Some(43781), None),
+    (unstable, doc_auto_cfg, "1.58.0", Some(43781), None),
     /// Allows `#[doc(cfg(...))]`.
-    (active, doc_cfg, "1.21.0", Some(43781), None),
+    (unstable, doc_cfg, "1.21.0", Some(43781), None),
     /// Allows `#[doc(cfg_hide(...))]`.
-    (active, doc_cfg_hide, "1.57.0", Some(43781), None),
+    (unstable, doc_cfg_hide, "1.57.0", Some(43781), None),
     /// Allows `#[doc(masked)]`.
-    (active, doc_masked, "1.21.0", Some(44027), None),
+    (unstable, doc_masked, "1.21.0", Some(44027), None),
     /// Allows `dyn* Trait` objects.
     (incomplete, dyn_star, "1.65.0", Some(102425), None),
     // Uses generic effect parameters for ~const bounds
-    (active, effects, "1.72.0", Some(102090), None),
+    (unstable, effects, "1.72.0", Some(102090), None),
     /// Allows `X..Y` patterns.
-    (active, exclusive_range_pattern, "1.11.0", Some(37854), None),
+    (unstable, exclusive_range_pattern, "1.11.0", Some(37854), None),
     /// Allows exhaustive pattern matching on types that contain uninhabited types.
-    (active, exhaustive_patterns, "1.13.0", Some(51085), None),
+    (unstable, exhaustive_patterns, "1.13.0", Some(51085), None),
     /// Allows explicit tail calls via `become` expression.
     (incomplete, explicit_tail_calls, "1.72.0", Some(112788), None),
     /// Allows using `efiapi`, `sysv64` and `win64` as calling convention
     /// for functions with varargs.
-    (active, extended_varargs_abi_support, "1.65.0", Some(100189), None),
+    (unstable, extended_varargs_abi_support, "1.65.0", Some(100189), None),
     /// Allows defining `extern type`s.
-    (active, extern_types, "1.23.0", Some(43467), None),
+    (unstable, extern_types, "1.23.0", Some(43467), None),
     /// Allows the use of `#[ffi_const]` on foreign functions.
-    (active, ffi_const, "1.45.0", Some(58328), None),
+    (unstable, ffi_const, "1.45.0", Some(58328), None),
     /// Allows the use of `#[ffi_pure]` on foreign functions.
-    (active, ffi_pure, "1.45.0", Some(58329), None),
+    (unstable, ffi_pure, "1.45.0", Some(58329), None),
     /// Allows using `#[ffi_returns_twice]` on foreign functions.
-    (active, ffi_returns_twice, "1.34.0", Some(58314), None),
+    (unstable, ffi_returns_twice, "1.34.0", Some(58314), None),
     /// Allows using `#[repr(align(...))]` on function items
-    (active, fn_align, "1.53.0", Some(82232), None),
-    /// Allows generators to be cloned.
-    (active, generator_clone, "1.65.0", Some(95360), None),
-    /// Allows defining generators.
-    (active, generators, "1.21.0", Some(43122), None),
+    (unstable, fn_align, "1.53.0", Some(82232), None),
+    /// Allows defining gen blocks and `gen fn`.
+    (unstable, gen_blocks, "1.75.0", Some(117078), None),
     /// Infer generic args for both consts and types.
-    (active, generic_arg_infer, "1.55.0", Some(85077), None),
+    (unstable, generic_arg_infer, "1.55.0", Some(85077), None),
     /// An extension to the `generic_associated_types` feature, allowing incomplete features.
     (incomplete, generic_associated_types_extended, "1.61.0", Some(95451), None),
     /// Allows non-trivial generic constants which have to have wfness manually propagated to callers
@@ -463,139 +467,137 @@ declare_features! (
     /// Allows generic parameters and where-clauses on free & associated const items.
     (incomplete, generic_const_items, "1.73.0", Some(113521), None),
     /// Allows using `..=X` as a patterns in slices.
-    (active, half_open_range_patterns_in_slices, "1.66.0", Some(67264), None),
+    (unstable, half_open_range_patterns_in_slices, "1.66.0", Some(67264), None),
     /// Allows `if let` guard in match arms.
-    (active, if_let_guard, "1.47.0", Some(51114), None),
+    (unstable, if_let_guard, "1.47.0", Some(51114), None),
     /// Allows `impl Trait` to be used inside associated types (RFC 2515).
-    (active, impl_trait_in_assoc_type, "1.70.0", Some(63063), None),
+    (unstable, impl_trait_in_assoc_type, "1.70.0", Some(63063), None),
     /// Allows `impl Trait` as output type in `Fn` traits in return position of functions.
-    (active, impl_trait_in_fn_trait_return, "1.64.0", Some(99697), None),
+    (unstable, impl_trait_in_fn_trait_return, "1.64.0", Some(99697), None),
     /// Allows using imported `main` function
-    (active, imported_main, "1.53.0", Some(28937), None),
+    (unstable, imported_main, "1.53.0", Some(28937), None),
     /// Allows associated types in inherent impls.
     (incomplete, inherent_associated_types, "1.52.0", Some(8995), None),
     /// Allow anonymous constants from an inline `const` block
-    (active, inline_const, "1.49.0", Some(76001), None),
+    (unstable, inline_const, "1.49.0", Some(76001), None),
     /// Allow anonymous constants from an inline `const` block in pattern position
     (incomplete, inline_const_pat, "1.58.0", Some(76001), None),
     /// Allows using `pointer` and `reference` in intra-doc links
-    (active, intra_doc_pointers, "1.51.0", Some(80896), None),
+    (unstable, intra_doc_pointers, "1.51.0", Some(80896), None),
     // Allows setting the threshold for the `large_assignments` lint.
-    (active, large_assignments, "1.52.0", Some(83518), None),
+    (unstable, large_assignments, "1.52.0", Some(83518), None),
     /// Allow to have type alias types for inter-crate use.
     (incomplete, lazy_type_alias, "1.72.0", Some(112792), None),
     /// Allows `if/while p && let q = r && ...` chains.
-    (active, let_chains, "1.37.0", Some(53667), None),
+    (unstable, let_chains, "1.37.0", Some(53667), None),
     /// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check.
-    (active, lint_reasons, "1.31.0", Some(54503), None),
+    (unstable, lint_reasons, "1.31.0", Some(54503), None),
     /// Give access to additional metadata about declarative macro meta-variables.
-    (active, macro_metavar_expr, "1.61.0", Some(83527), None),
+    (unstable, macro_metavar_expr, "1.61.0", Some(83527), None),
     /// Allows `#[marker]` on certain traits allowing overlapping implementations.
-    (active, marker_trait_attr, "1.30.0", Some(29864), None),
+    (unstable, marker_trait_attr, "1.30.0", Some(29864), None),
     /// A minimal, sound subset of specialization intended to be used by the
     /// standard library until the soundness issues with specialization
     /// are fixed.
-    (active, min_specialization, "1.7.0", Some(31844), None),
+    (unstable, min_specialization, "1.7.0", Some(31844), None),
     /// Allows qualified paths in struct expressions, struct patterns and tuple struct patterns.
-    (active, more_qualified_paths, "1.54.0", Some(86935), None),
+    (unstable, more_qualified_paths, "1.54.0", Some(86935), None),
     /// Allows the `#[must_not_suspend]` attribute.
-    (active, must_not_suspend, "1.57.0", Some(83310), None),
+    (unstable, must_not_suspend, "1.57.0", Some(83310), None),
     /// Allows using `#[naked]` on functions.
-    (active, naked_functions, "1.9.0", Some(32408), None),
+    (unstable, naked_functions, "1.9.0", Some(32408), None),
     /// Allows specifying the as-needed link modifier
-    (active, native_link_modifiers_as_needed, "1.53.0", Some(81490), None),
+    (unstable, native_link_modifiers_as_needed, "1.53.0", Some(81490), None),
     /// Allow negative trait implementations.
-    (active, negative_impls, "1.44.0", Some(68318), None),
+    (unstable, negative_impls, "1.44.0", Some(68318), None),
     /// Allows the `!` type. Does not imply 'exhaustive_patterns' (below) any more.
-    (active, never_type, "1.13.0", Some(35121), None),
+    (unstable, never_type, "1.13.0", Some(35121), None),
     /// Allows diverging expressions to fall back to `!` rather than `()`.
-    (active, never_type_fallback, "1.41.0", Some(65992), None),
+    (unstable, never_type_fallback, "1.41.0", Some(65992), None),
     /// Allows `#![no_core]`.
-    (active, no_core, "1.3.0", Some(29639), None),
+    (unstable, no_core, "1.3.0", Some(29639), None),
     /// Allows the use of `no_sanitize` attribute.
-    (active, no_sanitize, "1.42.0", Some(39699), None),
+    (unstable, no_sanitize, "1.42.0", Some(39699), None),
     /// Allows using the `non_exhaustive_omitted_patterns` lint.
-    (active, non_exhaustive_omitted_patterns_lint, "1.57.0", Some(89554), None),
+    (unstable, non_exhaustive_omitted_patterns_lint, "1.57.0", Some(89554), None),
     /// Allows `for<T>` binders in where-clauses
     (incomplete, non_lifetime_binders, "1.69.0", Some(108185), None),
     /// Allows making `dyn Trait` well-formed even if `Trait` is not object safe.
     /// In that case, `dyn Trait: Trait` does not hold. Moreover, coercions and
     /// casts in safe Rust to `dyn Trait` for such a `Trait` is also forbidden.
-    (active, object_safe_for_dispatch, "1.40.0", Some(43561), None),
+    (unstable, object_safe_for_dispatch, "1.40.0", Some(43561), None),
+    /// Allows using enums in offset_of!
+    (unstable, offset_of_enum, "1.75.0", Some(106655), None),
     /// Allows using `#[optimize(X)]`.
-    (active, optimize_attribute, "1.34.0", Some(54882), None),
-    /// Allows using `#![plugin(myplugin)]`.
-    (active, plugin, "1.0.0", Some(29597), None),
+    (unstable, optimize_attribute, "1.34.0", Some(54882), None),
     /// Allows exhaustive integer pattern matching on `usize` and `isize`.
-    (active, precise_pointer_size_matching, "1.32.0", Some(56354), None),
+    (unstable, precise_pointer_size_matching, "1.32.0", Some(56354), None),
     /// Allows macro attributes on expressions, statements and non-inline modules.
-    (active, proc_macro_hygiene, "1.30.0", Some(54727), None),
+    (unstable, proc_macro_hygiene, "1.30.0", Some(54727), None),
     /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.
-    (active, raw_ref_op, "1.41.0", Some(64490), None),
+    (unstable, raw_ref_op, "1.41.0", Some(64490), None),
     /// Allows using the `#[register_tool]` attribute.
-    (active, register_tool, "1.41.0", Some(66079), None),
+    (unstable, register_tool, "1.41.0", Some(66079), None),
     /// Allows the `#[repr(i128)]` attribute for enums.
     (incomplete, repr128, "1.16.0", Some(56071), None),
     /// Allows `repr(simd)` and importing the various simd intrinsics.
-    (active, repr_simd, "1.4.0", Some(27731), None),
-    /// Allows return-position `impl Trait` in traits.
-    (active, return_position_impl_trait_in_trait, "1.65.0", Some(91611), None),
+    (unstable, repr_simd, "1.4.0", Some(27731), None),
     /// Allows bounding the return type of AFIT/RPITIT.
     (incomplete, return_type_notation, "1.70.0", Some(109417), None),
     /// Allows `extern "rust-cold"`.
-    (active, rust_cold_cc, "1.63.0", Some(97544), None),
+    (unstable, rust_cold_cc, "1.63.0", Some(97544), None),
     /// Allows the use of SIMD types in functions declared in `extern` blocks.
-    (active, simd_ffi, "1.0.0", Some(27731), None),
+    (unstable, simd_ffi, "1.0.0", Some(27731), None),
     /// Allows specialization of implementations (RFC 1210).
     (incomplete, specialization, "1.7.0", Some(31844), None),
     /// Allows attributes on expressions and non-item statements.
-    (active, stmt_expr_attributes, "1.6.0", Some(15701), None),
+    (unstable, stmt_expr_attributes, "1.6.0", Some(15701), None),
     /// Allows lints part of the strict provenance effort.
-    (active, strict_provenance, "1.61.0", Some(95228), None),
+    (unstable, strict_provenance, "1.61.0", Some(95228), None),
     /// Allows string patterns to dereference values to match them.
-    (active, string_deref_patterns, "1.67.0", Some(87121), None),
+    (unstable, string_deref_patterns, "1.67.0", Some(87121), None),
     /// Allows the use of `#[target_feature]` on safe functions.
-    (active, target_feature_11, "1.45.0", Some(69098), None),
+    (unstable, target_feature_11, "1.45.0", Some(69098), None),
     /// Allows using `#[thread_local]` on `static` items.
-    (active, thread_local, "1.0.0", Some(29594), None),
+    (unstable, thread_local, "1.0.0", Some(29594), None),
     /// Allows defining `trait X = A + B;` alias items.
-    (active, trait_alias, "1.24.0", Some(41517), None),
+    (unstable, trait_alias, "1.24.0", Some(41517), None),
     /// Allows dyn upcasting trait objects via supertraits.
     /// Dyn upcasting is casting, e.g., `dyn Foo -> dyn Bar` where `Foo: Bar`.
-    (active, trait_upcasting, "1.56.0", Some(65991), None),
+    (unstable, trait_upcasting, "1.56.0", Some(65991), None),
     /// Allows for transmuting between arrays with sizes that contain generic consts.
-    (active, transmute_generic_consts, "1.70.0", Some(109929), None),
+    (unstable, transmute_generic_consts, "1.70.0", Some(109929), None),
     /// Allows #[repr(transparent)] on unions (RFC 2645).
-    (active, transparent_unions, "1.37.0", Some(60405), None),
+    (unstable, transparent_unions, "1.37.0", Some(60405), None),
     /// Allows inconsistent bounds in where clauses.
-    (active, trivial_bounds, "1.28.0", Some(48214), None),
+    (unstable, trivial_bounds, "1.28.0", Some(48214), None),
     /// Allows using `try {...}` expressions.
-    (active, try_blocks, "1.29.0", Some(31436), None),
+    (unstable, try_blocks, "1.29.0", Some(31436), None),
     /// Allows `impl Trait` to be used inside type aliases (RFC 2515).
-    (active, type_alias_impl_trait, "1.38.0", Some(63063), None),
+    (unstable, type_alias_impl_trait, "1.38.0", Some(63063), None),
     /// Allows the use of type ascription in expressions.
-    (active, type_ascription, "1.6.0", Some(23416), None),
+    (unstable, type_ascription, "1.6.0", Some(23416), None),
     /// Allows creation of instances of a struct by moving fields that have
     /// not changed from prior instances of the same struct (RFC #2528)
-    (active, type_changing_struct_update, "1.58.0", Some(86555), None),
+    (unstable, type_changing_struct_update, "1.58.0", Some(86555), None),
     /// Allows using type privacy lints (`private_interfaces`, `private_bounds`, `unnameable_types`).
-    (active, type_privacy_lints, "1.72.0", Some(48054), None),
+    (unstable, type_privacy_lints, "1.72.0", Some(48054), None),
     /// Enables rustc to generate code that instructs libstd to NOT ignore SIGPIPE.
-    (active, unix_sigpipe, "1.65.0", Some(97889), None),
+    (unstable, unix_sigpipe, "1.65.0", Some(97889), None),
     /// Allows unnamed fields of struct and union type
     (incomplete, unnamed_fields, "1.74.0", Some(49804), None),
     /// Allows unsized fn parameters.
-    (active, unsized_fn_params, "1.49.0", Some(48055), None),
+    (unstable, unsized_fn_params, "1.49.0", Some(48055), None),
     /// Allows unsized rvalues at arguments and parameters.
     (incomplete, unsized_locals, "1.30.0", Some(48055), None),
     /// Allows unsized tuple coercion.
-    (active, unsized_tuple_coercion, "1.20.0", Some(42877), None),
+    (unstable, unsized_tuple_coercion, "1.20.0", Some(42877), None),
     /// Allows using the `#[used(linker)]` (or `#[used(compiler)]`) attribute.
-    (active, used_with_arg, "1.60.0", Some(93798), None),
+    (unstable, used_with_arg, "1.60.0", Some(93798), None),
     /// Allows `extern "wasm" fn`
-    (active, wasm_abi, "1.53.0", Some(83788), None),
+    (unstable, wasm_abi, "1.53.0", Some(83788), None),
     /// Allows `do yeet` expressions
-    (active, yeet_expr, "1.62.0", Some(96373), None),
+    (unstable, yeet_expr, "1.62.0", Some(96373), None),
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!
     // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
     // !!!!    !!!!    !!!!    !!!!   !!!!    !!!!    !!!!    !!!!    !!!!    !!!!    !!!!