214e4ef4ef
Split out a separate feature gate for impl trait in associated types in https://github.com/rust-lang/rust/issues/107645 it was decided that we'll take a new route for type alias impl trait. The exact route isn't clear yet, so while I'm working on implementing some of these proposed changes (e.g. in https://github.com/rust-lang/rust/pull/110010) to be able to experiment with them, I will also work on stabilizing another sugar version first: impl trait in associated types. Similarly I'll look into creating feature gates for impl trait in const/static types. This PR does nothing but split the feature gate, so that you need to enable a different feature gate for ```rust impl Trait for Type { type Assoc = impl SomeTrait; } ``` than what you need for `type Foo = impl SomeTrait;`
567 lines
30 KiB
Rust
567 lines
30 KiB
Rust
//! List of the active feature gates.
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use super::{to_nonzero, Feature, State};
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use rustc_data_structures::fx::FxHashSet;
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use rustc_span::edition::Edition;
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use rustc_span::symbol::{sym, Symbol};
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use rustc_span::Span;
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macro_rules! set {
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($field: ident) => {{
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fn f(features: &mut Features, _: Span) {
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features.$field = true;
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}
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f as fn(&mut Features, Span)
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}};
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}
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macro_rules! declare_features {
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(__status_to_bool active) => {
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false
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};
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(__status_to_bool incomplete) => {
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true
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};
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($(
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$(#[doc = $doc:tt])* ($status:ident, $feature:ident, $ver:expr, $issue:expr, $edition:expr),
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)+) => {
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/// Represents active features that are currently being implemented or
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/// currently being considered for addition/removal.
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pub const ACTIVE_FEATURES:
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&[Feature] =
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&[$(
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// (sym::$feature, $ver, $issue, $edition, set!($feature))
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Feature {
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state: State::Active { set: set!($feature) },
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name: sym::$feature,
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since: $ver,
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issue: to_nonzero($issue),
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edition: $edition,
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}
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),+];
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/// A set of features to be used by later passes.
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#[derive(Clone, Default, Debug)]
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pub struct Features {
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/// `#![feature]` attrs for language features, for error reporting.
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pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>,
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/// `#![feature]` attrs for non-language (library) features.
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pub declared_lib_features: Vec<(Symbol, Span)>,
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/// Features enabled for this crate.
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pub active_features: FxHashSet<Symbol>,
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$(
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$(#[doc = $doc])*
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pub $feature: bool
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),+
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}
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impl Features {
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pub fn walk_feature_fields(&self, mut f: impl FnMut(&str, bool)) {
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$(f(stringify!($feature), self.$feature);)+
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}
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/// Is the given feature active?
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pub fn active(&self, feature: Symbol) -> bool {
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self.active_features.contains(&feature)
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}
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/// Is the given feature enabled?
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///
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/// Panics if the symbol doesn't correspond to a declared feature.
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pub fn enabled(&self, feature: Symbol) -> bool {
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match feature {
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$( sym::$feature => self.$feature, )*
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_ => panic!("`{}` was not listed in `declare_features`", feature),
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}
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}
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/// Some features are known to be incomplete and using them is likely to have
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/// unanticipated results, such as compiler crashes. We warn the user about these
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/// to alert them.
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pub fn incomplete(&self, feature: Symbol) -> bool {
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match feature {
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$(
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sym::$feature => declare_features!(__status_to_bool $status),
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)*
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// accepted and removed features aren't in this file but are never incomplete
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_ if self.declared_lang_features.iter().any(|f| f.0 == feature) => false,
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_ if self.declared_lib_features.iter().any(|f| f.0 == feature) => false,
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_ => panic!("`{}` was not listed in `declare_features`", feature),
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}
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}
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}
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};
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}
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impl Feature {
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/// Sets this feature in `Features`. Panics if called on a non-active feature.
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pub fn set(&self, features: &mut Features, span: Span) {
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match self.state {
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State::Active { set } => set(features, span),
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_ => panic!("called `set` on feature `{}` which is not `active`", self.name),
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}
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}
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}
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// See https://rustc-dev-guide.rust-lang.org/feature-gates.html#feature-gates for more
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// documentation about handling feature gates.
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//
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// If you change this, please modify `src/doc/unstable-book` as well.
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//
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// Don't ever remove anything from this list; move them to `accepted.rs` if
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// accepted or `removed.rs` if removed.
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//
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// The version numbers here correspond to the version in which the current status
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// was set. This is most important for knowing when a particular feature became
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// stable (active).
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//
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// Note that the features are grouped into internal/user-facing and then
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// sorted by version inside those groups. This is enforced with tidy.
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//
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// N.B., `tools/tidy/src/features.rs` parses this information directly out of the
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// source, so take care when modifying it.
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#[rustfmt::skip]
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declare_features! (
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// -------------------------------------------------------------------------
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// feature-group-start: internal feature gates (no tracking issue)
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// -------------------------------------------------------------------------
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// no-tracking-issue-start
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/// Allows using the `thiscall` ABI.
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(active, abi_thiscall, "1.19.0", None, None),
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/// Allows using the `unadjusted` ABI; perma-unstable.
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(active, abi_unadjusted, "1.16.0", None, None),
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/// Allows using the `vectorcall` ABI.
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(active, abi_vectorcall, "1.7.0", None, None),
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/// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`.
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(active, allocator_internals, "1.20.0", None, None),
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/// Allows using `#[allow_internal_unsafe]`. This is an
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/// attribute on `macro_rules!` and can't use the attribute handling
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/// below (it has to be checked before expansion possibly makes
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/// macros disappear).
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(active, allow_internal_unsafe, "1.0.0", None, None),
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/// Allows using `#[allow_internal_unstable]`. This is an
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/// attribute on `macro_rules!` and can't use the attribute handling
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/// below (it has to be checked before expansion possibly makes
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/// macros disappear).
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(active, allow_internal_unstable, "1.0.0", None, None),
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/// Allows using anonymous lifetimes in argument-position impl-trait.
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(active, anonymous_lifetime_in_impl_trait, "1.63.0", None, None),
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/// Allows identifying the `compiler_builtins` crate.
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(active, compiler_builtins, "1.13.0", None, None),
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/// Allows writing custom MIR
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(active, custom_mir, "1.65.0", None, None),
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/// Outputs useful `assert!` messages
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(active, generic_assert, "1.63.0", None, None),
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/// Allows using the `rust-intrinsic`'s "ABI".
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(active, intrinsics, "1.0.0", None, None),
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/// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic.
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(active, lang_items, "1.0.0", None, None),
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/// Allows `#[link(..., cfg(..))]`; perma-unstable per #37406
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(active, link_cfg, "1.14.0", None, None),
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/// Allows the `multiple_supertrait_upcastable` lint.
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(active, multiple_supertrait_upcastable, "1.69.0", None, None),
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/// Allows using `#[omit_gdb_pretty_printer_section]`.
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(active, omit_gdb_pretty_printer_section, "1.5.0", None, None),
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/// Allows using `#[prelude_import]` on glob `use` items.
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(active, prelude_import, "1.2.0", None, None),
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/// Used to identify crates that contain the profiler runtime.
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(active, profiler_runtime, "1.18.0", None, None),
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/// Allows using `rustc_*` attributes (RFC 572).
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(active, rustc_attrs, "1.0.0", None, None),
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/// Allows using the `#[stable]` and `#[unstable]` attributes.
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(active, staged_api, "1.0.0", None, None),
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/// Added for testing E0705; perma-unstable.
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(active, test_2018_feature, "1.31.0", None, Some(Edition::Edition2018)),
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/// Added for testing unstable lints; perma-unstable.
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(active, test_unstable_lint, "1.60.0", None, None),
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/// Allows non-`unsafe` —and thus, unsound— access to `Pin` constructions.
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/// Marked `incomplete` since perma-unstable and unsound.
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(incomplete, unsafe_pin_internals, "1.60.0", None, None),
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/// Use for stable + negative coherence and strict coherence depending on trait's
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/// rustc_strict_coherence value.
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(active, with_negative_coherence, "1.60.0", None, None),
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// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
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// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
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// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
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// no-tracking-issue-end
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// -------------------------------------------------------------------------
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// feature-group-end: internal feature gates (no tracking issue)
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// -------------------------------------------------------------------------
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// -------------------------------------------------------------------------
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// feature-group-start: internal feature gates
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// -------------------------------------------------------------------------
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/// Allows features specific to auto traits.
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/// Renamed from `optin_builtin_traits`.
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(active, auto_traits, "1.50.0", Some(13231), None),
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/// Allows using `box` in patterns (RFC 469).
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(active, box_patterns, "1.0.0", Some(29641), None),
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/// Allows `#[doc(notable_trait)]`.
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/// Renamed from `doc_spotlight`.
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(active, doc_notable_trait, "1.52.0", Some(45040), None),
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/// Allows using the `may_dangle` attribute (RFC 1327).
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(active, dropck_eyepatch, "1.10.0", Some(34761), None),
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/// Allows using the `#[fundamental]` attribute.
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(active, fundamental, "1.0.0", Some(29635), None),
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/// Allows using `#[link_name="llvm.*"]`.
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(active, link_llvm_intrinsics, "1.0.0", Some(29602), None),
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/// Allows using the `#[linkage = ".."]` attribute.
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(active, linkage, "1.0.0", Some(29603), None),
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/// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed.
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(active, needs_panic_runtime, "1.10.0", Some(32837), None),
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/// Allows using `+bundled,+whole-archive` native libs.
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(active, packed_bundled_libs, "1.69.0", Some(108081), None),
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/// Allows using the `#![panic_runtime]` attribute.
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(active, panic_runtime, "1.10.0", Some(32837), None),
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/// Allows using `#[rustc_allow_const_fn_unstable]`.
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/// This is an attribute on `const fn` for the same
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/// purpose as `#[allow_internal_unstable]`.
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(active, rustc_allow_const_fn_unstable, "1.49.0", Some(69399), None),
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/// Allows using compiler's own crates.
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(active, rustc_private, "1.0.0", Some(27812), None),
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/// Allows using internal rustdoc features like `doc(keyword)`.
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(active, rustdoc_internals, "1.58.0", Some(90418), None),
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/// Allows using the `rustdoc::missing_doc_code_examples` lint
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(active, rustdoc_missing_doc_code_examples, "1.31.0", Some(101730), None),
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/// Allows using `#[start]` on a function indicating that it is the program entrypoint.
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(active, start, "1.0.0", Some(29633), None),
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/// Allows using `#[structural_match]` which indicates that a type is structurally matchable.
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/// FIXME: Subsumed by trait `StructuralPartialEq`, cannot move to removed until a library
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/// feature with the same name exists.
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(active, structural_match, "1.8.0", Some(31434), None),
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/// Allows using the `rust-call` ABI.
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(active, unboxed_closures, "1.0.0", Some(29625), None),
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// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
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// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
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// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
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// -------------------------------------------------------------------------
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// feature-group-end: internal feature gates
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// -------------------------------------------------------------------------
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// -------------------------------------------------------------------------
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// feature-group-start: actual feature gates (target features)
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// -------------------------------------------------------------------------
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// FIXME: Document these and merge with the list below.
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// Unstable `#[target_feature]` directives.
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(active, aarch64_ver_target_feature, "1.27.0", Some(44839), None),
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(active, arm_target_feature, "1.27.0", Some(44839), None),
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(active, avx512_target_feature, "1.27.0", Some(44839), None),
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(active, bpf_target_feature, "1.54.0", Some(44839), None),
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(active, ermsb_target_feature, "1.49.0", Some(44839), None),
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(active, hexagon_target_feature, "1.27.0", Some(44839), None),
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(active, mips_target_feature, "1.27.0", Some(44839), None),
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(active, powerpc_target_feature, "1.27.0", Some(44839), None),
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(active, riscv_target_feature, "1.45.0", Some(44839), None),
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(active, rtm_target_feature, "1.35.0", Some(44839), None),
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(active, sse4a_target_feature, "1.27.0", Some(44839), None),
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(active, tbm_target_feature, "1.27.0", Some(44839), None),
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(active, wasm_target_feature, "1.30.0", Some(44839), None),
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// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
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// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
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// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
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// -------------------------------------------------------------------------
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// feature-group-end: actual feature gates (target features)
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// -------------------------------------------------------------------------
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// -------------------------------------------------------------------------
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// feature-group-start: actual feature gates
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// -------------------------------------------------------------------------
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/// Allows using the `amdgpu-kernel` ABI.
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(active, abi_amdgpu_kernel, "1.29.0", Some(51575), None),
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/// Allows `extern "avr-interrupt" fn()` and `extern "avr-non-blocking-interrupt" fn()`.
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(active, abi_avr_interrupt, "1.45.0", Some(69664), None),
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/// Allows `extern "C-cmse-nonsecure-call" fn()`.
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(active, abi_c_cmse_nonsecure_call, "1.51.0", Some(81391), None),
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/// Allows `extern "msp430-interrupt" fn()`.
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(active, abi_msp430_interrupt, "1.16.0", Some(38487), None),
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/// Allows `extern "ptx-*" fn()`.
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(active, abi_ptx, "1.15.0", Some(38788), None),
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/// Allows `extern "x86-interrupt" fn()`.
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(active, abi_x86_interrupt, "1.17.0", Some(40180), None),
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/// Allows additional const parameter types, such as `&'static str` or user defined types
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(incomplete, adt_const_params, "1.56.0", Some(95174), None),
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/// Allows defining an `#[alloc_error_handler]`.
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(active, alloc_error_handler, "1.29.0", Some(51540), None),
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/// Allows trait methods with arbitrary self types.
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(active, arbitrary_self_types, "1.23.0", Some(44874), None),
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/// Allows using `const` operands in inline assembly.
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(active, asm_const, "1.58.0", Some(93332), None),
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/// Enables experimental inline assembly support for additional architectures.
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(active, asm_experimental_arch, "1.58.0", Some(93335), None),
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/// Allows the `may_unwind` option in inline assembly.
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(active, asm_unwind, "1.58.0", Some(93334), None),
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/// Allows users to enforce equality of associated constants `TraitImpl<AssocConst=3>`.
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(active, associated_const_equality, "1.58.0", Some(92827), None),
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/// Allows the user of associated type bounds.
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(active, associated_type_bounds, "1.34.0", Some(52662), None),
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/// Allows associated type defaults.
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(active, associated_type_defaults, "1.2.0", Some(29661), None),
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/// Allows `async || body` closures.
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(active, async_closure, "1.37.0", Some(62290), None),
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/// Allows async functions to be declared, implemented, and used in traits.
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(incomplete, async_fn_in_trait, "1.66.0", Some(91611), None),
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/// Allows `extern "C-unwind" fn` to enable unwinding across ABI boundaries.
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(active, c_unwind, "1.52.0", Some(74990), None),
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/// Allows using C-variadics.
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(active, c_variadic, "1.34.0", Some(44930), None),
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/// Allows the use of `#[cfg(sanitize = "option")]`; set when -Zsanitizer is used.
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(active, cfg_sanitize, "1.41.0", Some(39699), None),
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/// Allows `cfg(target_abi = "...")`.
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(active, cfg_target_abi, "1.55.0", Some(80970), None),
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/// Allows `cfg(target(abi = "..."))`.
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(active, cfg_target_compact, "1.63.0", Some(96901), None),
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/// Allows `cfg(target_has_atomic_load_store = "...")`.
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(active, cfg_target_has_atomic, "1.60.0", Some(94039), None),
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/// Allows `cfg(target_has_atomic_equal_alignment = "...")`.
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(active, cfg_target_has_atomic_equal_alignment, "1.60.0", Some(93822), None),
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/// Allows `cfg(target_thread_local)`.
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(active, cfg_target_thread_local, "1.7.0", Some(29594), None),
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/// Allow conditional compilation depending on rust version
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(active, cfg_version, "1.45.0", Some(64796), None),
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/// Allows `for<...>` on closures and generators.
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(active, closure_lifetime_binder, "1.64.0", Some(97362), None),
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/// Allows `#[track_caller]` on closures and generators.
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(active, closure_track_caller, "1.57.0", Some(87417), None),
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/// Allows to use the `#[cmse_nonsecure_entry]` attribute.
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(active, cmse_nonsecure_entry, "1.48.0", Some(75835), None),
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/// Allows use of the `#[collapse_debuginfo]` attribute.
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(active, collapse_debuginfo, "1.65.0", Some(100758), None),
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/// Allows `async {}` expressions in const contexts.
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(active, const_async_blocks, "1.53.0", Some(85368), None),
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/// Allows `const || {}` closures in const contexts.
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(incomplete, const_closures, "1.68.0", Some(106003), None),
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/// Allows limiting the evaluation steps of const expressions
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(active, const_eval_limit, "1.43.0", Some(67217), None),
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/// Allows the definition of `const extern fn` and `const unsafe extern fn`.
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(active, const_extern_fn, "1.40.0", Some(64926), None),
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/// Allows basic arithmetic on floating point types in a `const fn`.
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(active, const_fn_floating_point_arithmetic, "1.48.0", Some(57241), None),
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/// Allows `for _ in _` loops in const contexts.
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(active, const_for, "1.56.0", Some(87575), None),
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/// Allows using `&mut` in constant functions.
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(active, const_mut_refs, "1.41.0", Some(57349), None),
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/// Be more precise when looking for live drops in a const context.
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(active, const_precise_live_drops, "1.46.0", Some(73255), None),
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/// Allows references to types with interior mutability within constants
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(active, const_refs_to_cell, "1.51.0", Some(80384), None),
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/// Allows `impl const Trait for T` syntax.
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(active, const_trait_impl, "1.42.0", Some(67792), None),
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/// Allows the `?` operator in const contexts.
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(active, const_try, "1.56.0", Some(74935), None),
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/// Allows non-builtin attributes in inner attribute position.
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(active, custom_inner_attributes, "1.30.0", Some(54726), None),
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/// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.
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(active, custom_test_frameworks, "1.30.0", Some(50297), None),
|
|
/// Allows using `#[debugger_visualizer]`.
|
|
(active, debugger_visualizer, "1.62.0", Some(95939), None),
|
|
/// Allows declarative macros 2.0 (`macro`).
|
|
(active, 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),
|
|
/// Allows using `#[deprecated_safe]` to deprecate the safeness of a function or trait
|
|
(active, 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),
|
|
/// Controls errors in trait implementations.
|
|
(active, 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),
|
|
/// Allows `#[doc(cfg(...))]`.
|
|
(active, doc_cfg, "1.21.0", Some(43781), None),
|
|
/// Allows `#[doc(cfg_hide(...))]`.
|
|
(active, doc_cfg_hide, "1.57.0", Some(43781), None),
|
|
/// Allows `#[doc(masked)]`.
|
|
(active, doc_masked, "1.21.0", Some(44027), None),
|
|
/// Allows `dyn* Trait` objects.
|
|
(incomplete, dyn_star, "1.65.0", Some(102425), None),
|
|
/// Allows `X..Y` patterns.
|
|
(active, 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),
|
|
/// Allows using `efiapi`, `sysv64` and `win64` as calling convention
|
|
/// for functions with varargs.
|
|
(active, extended_varargs_abi_support, "1.65.0", Some(100189), None),
|
|
/// Allows defining `extern type`s.
|
|
(active, 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),
|
|
/// Allows the use of `#[ffi_pure]` on foreign functions.
|
|
(active, 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),
|
|
/// 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),
|
|
/// Infer generic args for both consts and types.
|
|
(active, 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
|
|
(incomplete, generic_const_exprs, "1.56.0", Some(76560), None),
|
|
/// Allows using `..=X` as a patterns in slices.
|
|
(active, 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),
|
|
/// Allows `impl Trait` to be used inside associated types (RFC 2515).
|
|
(active, impl_trait_in_assoc_type, "CURRENT_RUSTC_VERSION", 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),
|
|
/// Allows referencing `Self` and projections in impl-trait.
|
|
(active, impl_trait_projections, "1.67.0", Some(103532), None),
|
|
/// Allows using imported `main` function
|
|
(active, 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),
|
|
/// 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),
|
|
// Allows setting the threshold for the `large_assignments` lint.
|
|
(active, large_assignments, "1.52.0", Some(83518), None),
|
|
/// Allows `if/while p && let q = r && ...` chains.
|
|
(active, 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),
|
|
/// Give access to additional metadata about declarative macro meta-variables.
|
|
(active, 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),
|
|
/// 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),
|
|
/// Allows qualified paths in struct expressions, struct patterns and tuple struct patterns.
|
|
(active, 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),
|
|
/// Allows using `#[naked]` on functions.
|
|
(active, 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),
|
|
/// Allow negative trait implementations.
|
|
(active, 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),
|
|
/// Allows diverging expressions to fall back to `!` rather than `()`.
|
|
(active, never_type_fallback, "1.41.0", Some(65992), None),
|
|
/// Allows `#![no_core]`.
|
|
(active, no_core, "1.3.0", Some(29639), None),
|
|
/// Allows function attribute `#[no_coverage]`, to bypass coverage
|
|
/// instrumentation of that function.
|
|
(active, no_coverage, "1.53.0", Some(84605), None),
|
|
/// Allows the use of `no_sanitize` attribute.
|
|
(active, 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),
|
|
/// 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),
|
|
/// Allows using `#[optimize(X)]`.
|
|
(active, optimize_attribute, "1.34.0", Some(54882), None),
|
|
/// Allows `extern "platform-intrinsic" { ... }`.
|
|
(active, platform_intrinsics, "1.4.0", Some(27731), None),
|
|
/// Allows using `#![plugin(myplugin)]`.
|
|
(active, plugin, "1.0.0", Some(29597), None),
|
|
/// Allows exhaustive integer pattern matching on `usize` and `isize`.
|
|
(active, 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),
|
|
/// Allows the use of raw-dylibs (RFC 2627).
|
|
(active, raw_dylib, "1.65.0", Some(58713), None),
|
|
/// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.
|
|
(active, raw_ref_op, "1.41.0", Some(64490), None),
|
|
/// Allows using the `#[register_tool]` attribute.
|
|
(active, 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.
|
|
(incomplete, return_position_impl_trait_in_trait, "1.65.0", Some(91611), None),
|
|
/// Allows bounding the return type of AFIT/RPITIT.
|
|
(incomplete, return_type_notation, "CURRENT_RUSTC_VERSION", Some(109417), None),
|
|
/// Allows `extern "rust-cold"`.
|
|
(active, 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),
|
|
/// 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),
|
|
/// Allows lints part of the strict provenance effort.
|
|
(active, 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),
|
|
/// Allows the use of `#[target_feature]` on safe functions.
|
|
(active, 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),
|
|
/// Allows defining `trait X = A + B;` alias items.
|
|
(active, 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),
|
|
/// Allows for transmuting between arrays with sizes that contain generic consts.
|
|
(active, transmute_generic_consts, "CURRENT_RUSTC_VERSION", Some(109929), None),
|
|
/// Allows #[repr(transparent)] on unions (RFC 2645).
|
|
(active, transparent_unions, "1.37.0", Some(60405), None),
|
|
/// Allows inconsistent bounds in where clauses.
|
|
(active, trivial_bounds, "1.28.0", Some(48214), None),
|
|
/// Allows using `try {...}` expressions.
|
|
(active, 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),
|
|
/// Allows the use of type ascription in expressions.
|
|
(active, 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),
|
|
/// Enables rustc to generate code that instructs libstd to NOT ignore SIGPIPE.
|
|
(active, unix_sigpipe, "1.65.0", Some(97889), None),
|
|
/// Allows unsized fn parameters.
|
|
(active, 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),
|
|
/// Allows using the `#[used(linker)]` (or `#[used(compiler)]`) attribute.
|
|
(active, used_with_arg, "1.60.0", Some(93798), None),
|
|
/// Allows `extern "wasm" fn`
|
|
(active, wasm_abi, "1.53.0", Some(83788), None),
|
|
/// Allows `do yeet` expressions
|
|
(active, 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.
|
|
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
|
|
|
|
// -------------------------------------------------------------------------
|
|
// feature-group-end: actual feature gates
|
|
// -------------------------------------------------------------------------
|
|
);
|
|
|
|
/// Some features are not allowed to be used together at the same time, if
|
|
/// the two are present, produce an error.
|
|
///
|
|
/// Currently empty, but we will probably need this again in the future,
|
|
/// so let's keep it in for now.
|
|
pub const INCOMPATIBLE_FEATURES: &[(Symbol, Symbol)] = &[];
|