e094ee5f10
Using an obviously-placeholder syntax. An RFC would still be needed before this could have any chance at stabilization, and it might be removed at any point. But I'd really like to have it in nightly at least to ensure it works well with try_trait_v2, especially as we refactor the traits.
564 lines
30 KiB
Rust
564 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 identifying the `compiler_builtins` crate.
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(active, compiler_builtins, "1.13.0", 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 `#[repr(no_niche)]` (an implementation detail of `rustc`,
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/// it is not on path for eventual stabilization).
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(active, no_niche, "1.42.0", 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 using the `box $expr` syntax.
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(active, box_syntax, "1.0.0", Some(49733), 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 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(primitive)` or `doc(keyword)`.
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(active, rustdoc_internals, "1.58.0", Some(90418), 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, adx_target_feature, "1.32.0", 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, cmpxchg16b_target_feature, "1.32.0", Some(44839), None),
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(active, ermsb_target_feature, "1.49.0", Some(44839), None),
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(active, f16c_target_feature, "1.36.0", 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, movbe_target_feature, "1.34.0", 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 using the `efiapi` ABI.
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(active, abi_efiapi, "1.40.0", Some(65815), 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 explicit discriminants on non-unit enum variants.
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(active, arbitrary_enum_discriminant, "1.37.0", Some(60553), 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 using `sym` operands in inline assembly.
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(active, asm_sym, "1.58.0", Some(93333), 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 `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 capturing disjoint fields in a closure/generator (RFC 2229).
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(incomplete, capture_disjoint_fields, "1.49.0", Some(53488), 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_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),
|
|
/// Allows `cfg(target_thread_local)`.
|
|
(active, 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),
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|
/// Allows `#[track_caller]` on closures and generators.
|
|
(active, 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),
|
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/// Allows `async {}` expressions in const contexts.
|
|
(active, const_async_blocks, "1.53.0", Some(85368), None),
|
|
// Allows limiting the evaluation steps of const expressions
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|
(active, const_eval_limit, "1.43.0", Some(67217), None),
|
|
/// 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),
|
|
/// Allows `for _ in _` loops in const contexts.
|
|
(active, const_for, "1.56.0", Some(87575), None),
|
|
/// 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.
|
|
(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 using `crate` as visibility modifier, synonymous with `pub(crate)`.
|
|
(active, crate_visibility_modifier, "1.23.0", Some(53120), 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),
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/// Allows declarative macros 2.0 (`macro`).
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|
(active, decl_macro, "1.17.0", Some(39412), None),
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|
/// Allows rustc to inject a default alloc_error_handler
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|
(active, default_alloc_error_handler, "1.48.0", Some(66741), None),
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/// Allows default type parameters to influence type inference.
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|
(active, default_type_parameter_fallback, "1.3.0", Some(27336), None),
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/// 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),
|
|
/// 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 `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 explicit generic arguments specification with `impl Trait` present.
|
|
(active, explicit_generic_args_with_impl_trait, "1.56.0", Some(83701), 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 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),
|
|
/// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598).
|
|
(active, generic_associated_types, "1.23.0", Some(44265), 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`, `..=X`, `...X`, and `X..` as a pattern.
|
|
(active, half_open_range_patterns, "1.41.0", Some(67264), None),
|
|
/// Allows `if let` guard in match arms.
|
|
(active, if_let_guard, "1.47.0", Some(51114), None),
|
|
/// Allows using imported `main` function
|
|
(active, imported_main, "1.53.0", Some(28937), None),
|
|
/// Allows inferring `'static` outlives requirements (RFC 2093).
|
|
(active, infer_static_outlives_requirements, "1.26.0", Some(54185), 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 `#[instruction_set(_)]` attribute
|
|
(active, isa_attribute, "1.48.0", Some(74727), None),
|
|
/// Allows `'a: { break 'a; }`.
|
|
(active, label_break_value, "1.28.0", Some(48594), 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 `let...else` statements.
|
|
(active, let_else, "1.56.0", Some(87335), None),
|
|
/// Allows `#[link(..., cfg(..))]`.
|
|
(active, link_cfg, "1.14.0", Some(37406), 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),
|
|
/// Allows specifying the bundle link modifier
|
|
(active, native_link_modifiers_bundle, "1.53.0", Some(81490), None),
|
|
/// Allows specifying the verbatim link modifier
|
|
(active, native_link_modifiers_verbatim, "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 using non lexical lifetimes (RFC 2094).
|
|
(active, nll, "1.0.0", Some(43234), 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 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).
|
|
(incomplete, raw_dylib, "1.40.0", 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_attr]` attribute.
|
|
(active, register_attr, "1.41.0", Some(66080), 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 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 `#[link(kind="static-nobundle"...)]`.
|
|
(active, static_nobundle, "1.16.0", Some(37403), 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 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 upcasting trait objects via supertraits.
|
|
/// Trait upcasting is casting, e.g., `dyn Foo -> dyn Bar` where `Foo: Bar`.
|
|
(incomplete, trait_upcasting, "1.56.0", Some(65991), 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)
|
|
(incomplete, type_changing_struct_update, "1.58.0", Some(86555), 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 `union`s to implement `Drop`. Moreover, `union`s may now include fields
|
|
/// that don't implement `Copy` as long as they don't have any drop glue.
|
|
/// This is checked recursively. On encountering type variable where no progress can be made,
|
|
/// `T: Copy` is used as a substitute for "no drop glue".
|
|
///
|
|
/// NOTE: A limited form of `union U { ... }` was accepted in 1.19.0.
|
|
(active, untagged_unions, "1.13.0", Some(55149), 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)] = &[];
|