"rustc_data_structures",
"rustc_error_codes",
"rustc_errors",
+ "rustc_feature",
"rustc_fs_util",
"rustc_index",
"rustc_macros",
"unicode-width",
]
+[[package]]
+name = "rustc_feature"
+version = "0.0.0"
+dependencies = [
+ "syntax_pos",
+]
+
[[package]]
name = "rustc_fs_util"
version = "0.0.0"
"rustc",
"rustc_data_structures",
"rustc_error_codes",
+ "rustc_feature",
"rustc_index",
"rustc_target",
"syntax",
"rustc_data_structures",
"rustc_error_codes",
"rustc_errors",
+ "rustc_feature",
"rustc_lexer",
"rustc_target",
"smallvec 1.0.0",
"rustc_data_structures",
"rustc_error_codes",
"rustc_errors",
+ "rustc_feature",
"rustc_index",
"rustc_parse",
"rustc_target",
"rustc_data_structures",
"rustc_error_codes",
"rustc_errors",
+ "rustc_feature",
"rustc_index",
"rustc_lexer",
"rustc_macros",
"log",
"rustc_data_structures",
"rustc_errors",
+ "rustc_feature",
"rustc_lexer",
"rustc_parse",
"serialize",
"rustc_data_structures",
"rustc_error_codes",
"rustc_errors",
+ "rustc_feature",
"rustc_parse",
"rustc_target",
"smallvec 1.0.0",
rustc-rayon-core = "0.3.0"
polonius-engine = "0.10.0"
rustc_apfloat = { path = "../librustc_apfloat" }
+rustc_feature = { path = "../librustc_feature" }
rustc_target = { path = "../librustc_target" }
rustc_macros = { path = "../librustc_macros" }
rustc_data_structures = { path = "../librustc_data_structures" }
[few] resolve_lifetimes: rustc::middle::resolve_lifetime::ResolveLifetimes,
[few] lint_levels: rustc::lint::LintLevelMap,
[few] stability_index: rustc::middle::stability::Index<'tcx>,
- [few] features: syntax::feature_gate::Features,
+ [few] features: rustc_feature::Features,
[few] all_traits: Vec<rustc::hir::def_id::DefId>,
[few] privacy_access_levels: rustc::middle::privacy::AccessLevels,
[few] target_features_whitelist: rustc_data_structures::fx::FxHashMap<
use crate::ich::StableHashingContext;
use syntax::ast;
-use syntax::feature_gate;
use syntax_pos::SourceFile;
use crate::hir::def_id::{DefId, CrateNum, CRATE_DEF_INDEX};
}
-impl<'tcx> HashStable<StableHashingContext<'tcx>> for feature_gate::Features {
+impl<'tcx> HashStable<StableHashingContext<'tcx>> for rustc_feature::Features {
fn hash_stable(&self, hcx: &mut StableHashingContext<'tcx>, hasher: &mut StableHasher) {
// Unfortunately we cannot exhaustively list fields here, since the
// struct is macro generated.
desc { |tcx| "estimating size for `{}`", tcx.def_path_str(def.def_id()) }
}
- query features_query(_: CrateNum) -> &'tcx feature_gate::Features {
+ query features_query(_: CrateNum) -> &'tcx rustc_feature::Features {
eval_always
desc { "looking up enabled feature gates" }
}
use errors::emitter::HumanReadableErrorType;
use errors::annotate_snippet_emitter_writer::{AnnotateSnippetEmitterWriter};
use syntax::edition::Edition;
-use syntax::feature_gate;
use errors::json::JsonEmitter;
use syntax::source_map;
use syntax::sess::ParseSess;
/// `rustc_codegen_llvm::back::symbol_names` module for more information.
pub crate_disambiguator: Once<CrateDisambiguator>,
- features: Once<feature_gate::Features>,
+ features: Once<rustc_feature::Features>,
/// The maximum recursion limit for potentially infinitely recursive
/// operations such as auto-dereference and monomorphization.
/// DO NOT USE THIS METHOD if there is a TyCtxt available, as it circumvents
/// dependency tracking. Use tcx.features() instead.
#[inline]
- pub fn features_untracked(&self) -> &feature_gate::Features {
+ pub fn features_untracked(&self) -> &rustc_feature::Features {
self.features.get()
}
- pub fn init_features(&self, features: feature_gate::Features) {
+ pub fn init_features(&self, features: rustc_feature::Features) {
self.features.set(features);
}
use syntax::ast;
use syntax::attr;
use syntax::source_map::MultiSpan;
-use syntax::feature_gate;
use syntax::symbol::{Symbol, kw, sym};
use syntax_pos::Span;
use syntax::expand::allocator::AllocatorKind;
self.cstore.allocator_kind()
}
- pub fn features(self) -> &'tcx feature_gate::Features {
+ pub fn features(self) -> &'tcx rustc_feature::Features {
self.features_query(LOCAL_CRATE)
}
use syntax_pos::{Span, DUMMY_SP};
use syntax::attr;
use syntax::ast;
-use syntax::feature_gate;
use syntax::symbol::Symbol;
#[macro_use]
--- /dev/null
+[package]
+authors = ["The Rust Project Developers"]
+name = "rustc_feature"
+version = "0.0.0"
+edition = "2018"
+
+[lib]
+name = "rustc_feature"
+path = "lib.rs"
+doctest = false
+
+[dependencies]
+syntax_pos = { path = "../libsyntax_pos" }
--- /dev/null
+//! List of the accepted feature gates.
+
+use super::{State, Feature};
+use syntax_pos::symbol::sym;
+
+macro_rules! declare_features {
+ ($(
+ $(#[doc = $doc:tt])* (accepted, $feature:ident, $ver:expr, $issue:expr, None),
+ )+) => {
+ /// Those language feature has since been Accepted (it was once Active)
+ pub const ACCEPTED_FEATURES: &[Feature] = &[
+ $(
+ Feature {
+ state: State::Accepted,
+ name: sym::$feature,
+ since: $ver,
+ issue: $issue,
+ edition: None,
+ description: concat!($($doc,)*),
+ }
+ ),+
+ ];
+ }
+}
+
+declare_features! (
+ // -------------------------------------------------------------------------
+ // feature-group-start: for testing purposes
+ // -------------------------------------------------------------------------
+
+ /// A temporary feature gate used to enable parser extensions needed
+ /// to bootstrap fix for #5723.
+ (accepted, issue_5723_bootstrap, "1.0.0", None, None),
+ /// These are used to test this portion of the compiler,
+ /// they don't actually mean anything.
+ (accepted, test_accepted_feature, "1.0.0", None, None),
+
+ // -------------------------------------------------------------------------
+ // feature-group-end: for testing purposes
+ // -------------------------------------------------------------------------
+
+ // -------------------------------------------------------------------------
+ // feature-group-start: accepted features
+ // -------------------------------------------------------------------------
+
+ /// Allows using associated `type`s in `trait`s.
+ (accepted, associated_types, "1.0.0", None, None),
+ /// Allows using assigning a default type to type parameters in algebraic data type definitions.
+ (accepted, default_type_params, "1.0.0", None, None),
+ // FIXME: explain `globs`.
+ (accepted, globs, "1.0.0", None, None),
+ /// Allows `macro_rules!` items.
+ (accepted, macro_rules, "1.0.0", None, None),
+ /// Allows use of `&foo[a..b]` as a slicing syntax.
+ (accepted, slicing_syntax, "1.0.0", None, None),
+ /// Allows struct variants `Foo { baz: u8, .. }` in enums (RFC 418).
+ (accepted, struct_variant, "1.0.0", None, None),
+ /// Allows indexing tuples.
+ (accepted, tuple_indexing, "1.0.0", None, None),
+ /// Allows the use of `if let` expressions.
+ (accepted, if_let, "1.0.0", None, None),
+ /// Allows the use of `while let` expressions.
+ (accepted, while_let, "1.0.0", None, None),
+ /// Allows using `#![no_std]`.
+ (accepted, no_std, "1.6.0", None, None),
+ /// Allows overloading augmented assignment operations like `a += b`.
+ (accepted, augmented_assignments, "1.8.0", Some(28235), None),
+ /// Allows empty structs and enum variants with braces.
+ (accepted, braced_empty_structs, "1.8.0", Some(29720), None),
+ /// Allows `#[deprecated]` attribute.
+ (accepted, deprecated, "1.9.0", Some(29935), None),
+ /// Allows macros to appear in the type position.
+ (accepted, type_macros, "1.13.0", Some(27245), None),
+ /// Allows use of the postfix `?` operator in expressions.
+ (accepted, question_mark, "1.13.0", Some(31436), None),
+ /// Allows `..` in tuple (struct) patterns.
+ (accepted, dotdot_in_tuple_patterns, "1.14.0", Some(33627), None),
+ /// Allows some increased flexibility in the name resolution rules,
+ /// especially around globs and shadowing (RFC 1560).
+ (accepted, item_like_imports, "1.15.0", Some(35120), None),
+ /// Allows using `Self` and associated types in struct expressions and patterns.
+ (accepted, more_struct_aliases, "1.16.0", Some(37544), None),
+ /// Allows elision of `'static` lifetimes in `static`s and `const`s.
+ (accepted, static_in_const, "1.17.0", Some(35897), None),
+ /// Allows field shorthands (`x` meaning `x: x`) in struct literal expressions.
+ (accepted, field_init_shorthand, "1.17.0", Some(37340), None),
+ /// Allows the definition recursive static items.
+ (accepted, static_recursion, "1.17.0", Some(29719), None),
+ /// Allows `pub(restricted)` visibilities (RFC 1422).
+ (accepted, pub_restricted, "1.18.0", Some(32409), None),
+ /// Allows `#![windows_subsystem]`.
+ (accepted, windows_subsystem, "1.18.0", Some(37499), None),
+ /// Allows `break {expr}` with a value inside `loop`s.
+ (accepted, loop_break_value, "1.19.0", Some(37339), None),
+ /// Allows numeric fields in struct expressions and patterns.
+ (accepted, relaxed_adts, "1.19.0", Some(35626), None),
+ /// Allows coercing non capturing closures to function pointers.
+ (accepted, closure_to_fn_coercion, "1.19.0", Some(39817), None),
+ /// Allows attributes on struct literal fields.
+ (accepted, struct_field_attributes, "1.20.0", Some(38814), None),
+ /// Allows the definition of associated constants in `trait` or `impl` blocks.
+ (accepted, associated_consts, "1.20.0", Some(29646), None),
+ /// Allows usage of the `compile_error!` macro.
+ (accepted, compile_error, "1.20.0", Some(40872), None),
+ /// Allows code like `let x: &'static u32 = &42` to work (RFC 1414).
+ (accepted, rvalue_static_promotion, "1.21.0", Some(38865), None),
+ /// Allows `Drop` types in constants (RFC 1440).
+ (accepted, drop_types_in_const, "1.22.0", Some(33156), None),
+ /// Allows the sysV64 ABI to be specified on all platforms
+ /// instead of just the platforms on which it is the C ABI.
+ (accepted, abi_sysv64, "1.24.0", Some(36167), None),
+ /// Allows `repr(align(16))` struct attribute (RFC 1358).
+ (accepted, repr_align, "1.25.0", Some(33626), None),
+ /// Allows '|' at beginning of match arms (RFC 1925).
+ (accepted, match_beginning_vert, "1.25.0", Some(44101), None),
+ /// Allows nested groups in `use` items (RFC 2128).
+ (accepted, use_nested_groups, "1.25.0", Some(44494), None),
+ /// Allows indexing into constant arrays.
+ (accepted, const_indexing, "1.26.0", Some(29947), None),
+ /// Allows using `a..=b` and `..=b` as inclusive range syntaxes.
+ (accepted, inclusive_range_syntax, "1.26.0", Some(28237), None),
+ /// Allows `..=` in patterns (RFC 1192).
+ (accepted, dotdoteq_in_patterns, "1.26.0", Some(28237), None),
+ /// Allows `fn main()` with return types which implements `Termination` (RFC 1937).
+ (accepted, termination_trait, "1.26.0", Some(43301), None),
+ /// Allows implementing `Clone` for closures where possible (RFC 2132).
+ (accepted, clone_closures, "1.26.0", Some(44490), None),
+ /// Allows implementing `Copy` for closures where possible (RFC 2132).
+ (accepted, copy_closures, "1.26.0", Some(44490), None),
+ /// Allows `impl Trait` in function arguments.
+ (accepted, universal_impl_trait, "1.26.0", Some(34511), None),
+ /// Allows `impl Trait` in function return types.
+ (accepted, conservative_impl_trait, "1.26.0", Some(34511), None),
+ /// Allows using the `u128` and `i128` types.
+ (accepted, i128_type, "1.26.0", Some(35118), None),
+ /// Allows default match binding modes (RFC 2005).
+ (accepted, match_default_bindings, "1.26.0", Some(42640), None),
+ /// Allows `'_` placeholder lifetimes.
+ (accepted, underscore_lifetimes, "1.26.0", Some(44524), None),
+ /// Allows attributes on lifetime/type formal parameters in generics (RFC 1327).
+ (accepted, generic_param_attrs, "1.27.0", Some(48848), None),
+ /// Allows `cfg(target_feature = "...")`.
+ (accepted, cfg_target_feature, "1.27.0", Some(29717), None),
+ /// Allows `#[target_feature(...)]`.
+ (accepted, target_feature, "1.27.0", None, None),
+ /// Allows using `dyn Trait` as a syntax for trait objects.
+ (accepted, dyn_trait, "1.27.0", Some(44662), None),
+ /// Allows `#[must_use]` on functions, and introduces must-use operators (RFC 1940).
+ (accepted, fn_must_use, "1.27.0", Some(43302), None),
+ /// Allows use of the `:lifetime` macro fragment specifier.
+ (accepted, macro_lifetime_matcher, "1.27.0", Some(34303), None),
+ /// Allows `#[test]` functions where the return type implements `Termination` (RFC 1937).
+ (accepted, termination_trait_test, "1.27.0", Some(48854), None),
+ /// Allows the `#[global_allocator]` attribute.
+ (accepted, global_allocator, "1.28.0", Some(27389), None),
+ /// Allows `#[repr(transparent)]` attribute on newtype structs.
+ (accepted, repr_transparent, "1.28.0", Some(43036), None),
+ /// Allows procedural macros in `proc-macro` crates.
+ (accepted, proc_macro, "1.29.0", Some(38356), None),
+ /// Allows `foo.rs` as an alternative to `foo/mod.rs`.
+ (accepted, non_modrs_mods, "1.30.0", Some(44660), None),
+ /// Allows use of the `:vis` macro fragment specifier
+ (accepted, macro_vis_matcher, "1.30.0", Some(41022), None),
+ /// Allows importing and reexporting macros with `use`,
+ /// enables macro modularization in general.
+ (accepted, use_extern_macros, "1.30.0", Some(35896), None),
+ /// Allows keywords to be escaped for use as identifiers.
+ (accepted, raw_identifiers, "1.30.0", Some(48589), None),
+ /// Allows attributes scoped to tools.
+ (accepted, tool_attributes, "1.30.0", Some(44690), None),
+ /// Allows multi-segment paths in attributes and derives.
+ (accepted, proc_macro_path_invoc, "1.30.0", Some(38356), None),
+ /// Allows all literals in attribute lists and values of key-value pairs.
+ (accepted, attr_literals, "1.30.0", Some(34981), None),
+ /// Allows inferring outlives requirements (RFC 2093).
+ (accepted, infer_outlives_requirements, "1.30.0", Some(44493), None),
+ /// Allows annotating functions conforming to `fn(&PanicInfo) -> !` with `#[panic_handler]`.
+ /// This defines the behavior of panics.
+ (accepted, panic_handler, "1.30.0", Some(44489), None),
+ /// Allows `#[used]` to preserve symbols (see llvm.used).
+ (accepted, used, "1.30.0", Some(40289), None),
+ /// Allows `crate` in paths.
+ (accepted, crate_in_paths, "1.30.0", Some(45477), None),
+ /// Allows resolving absolute paths as paths from other crates.
+ (accepted, extern_absolute_paths, "1.30.0", Some(44660), None),
+ /// Allows access to crate names passed via `--extern` through prelude.
+ (accepted, extern_prelude, "1.30.0", Some(44660), None),
+ /// Allows parentheses in patterns.
+ (accepted, pattern_parentheses, "1.31.0", Some(51087), None),
+ /// Allows the definition of `const fn` functions.
+ (accepted, min_const_fn, "1.31.0", Some(53555), None),
+ /// Allows scoped lints.
+ (accepted, tool_lints, "1.31.0", Some(44690), None),
+ /// Allows lifetime elision in `impl` headers. For example:
+ /// + `impl<I:Iterator> Iterator for &mut Iterator`
+ /// + `impl Debug for Foo<'_>`
+ (accepted, impl_header_lifetime_elision, "1.31.0", Some(15872), None),
+ /// Allows `extern crate foo as bar;`. This puts `bar` into extern prelude.
+ (accepted, extern_crate_item_prelude, "1.31.0", Some(55599), None),
+ /// Allows use of the `:literal` macro fragment specifier (RFC 1576).
+ (accepted, macro_literal_matcher, "1.32.0", Some(35625), None),
+ /// Allows use of `?` as the Kleene "at most one" operator in macros.
+ (accepted, macro_at_most_once_rep, "1.32.0", Some(48075), None),
+ /// Allows `Self` struct constructor (RFC 2302).
+ (accepted, self_struct_ctor, "1.32.0", Some(51994), None),
+ /// Allows `Self` in type definitions (RFC 2300).
+ (accepted, self_in_typedefs, "1.32.0", Some(49303), None),
+ /// Allows `use x::y;` to search `x` in the current scope.
+ (accepted, uniform_paths, "1.32.0", Some(53130), None),
+ /// Allows integer match exhaustiveness checking (RFC 2591).
+ (accepted, exhaustive_integer_patterns, "1.33.0", Some(50907), None),
+ /// Allows `use path as _;` and `extern crate c as _;`.
+ (accepted, underscore_imports, "1.33.0", Some(48216), None),
+ /// Allows `#[repr(packed(N))]` attribute on structs.
+ (accepted, repr_packed, "1.33.0", Some(33158), None),
+ /// Allows irrefutable patterns in `if let` and `while let` statements (RFC 2086).
+ (accepted, irrefutable_let_patterns, "1.33.0", Some(44495), None),
+ /// Allows calling `const unsafe fn` inside `unsafe` blocks in `const fn` functions.
+ (accepted, min_const_unsafe_fn, "1.33.0", Some(55607), None),
+ /// Allows let bindings, assignments and destructuring in `const` functions and constants.
+ /// As long as control flow is not implemented in const eval, `&&` and `||` may not be used
+ /// at the same time as let bindings.
+ (accepted, const_let, "1.33.0", Some(48821), None),
+ /// Allows `#[cfg_attr(predicate, multiple, attributes, here)]`.
+ (accepted, cfg_attr_multi, "1.33.0", Some(54881), None),
+ /// Allows top level or-patterns (`p | q`) in `if let` and `while let`.
+ (accepted, if_while_or_patterns, "1.33.0", Some(48215), None),
+ /// Allows `cfg(target_vendor = "...")`.
+ (accepted, cfg_target_vendor, "1.33.0", Some(29718), None),
+ /// Allows `extern crate self as foo;`.
+ /// This puts local crate root into extern prelude under name `foo`.
+ (accepted, extern_crate_self, "1.34.0", Some(56409), None),
+ /// Allows arbitrary delimited token streams in non-macro attributes.
+ (accepted, unrestricted_attribute_tokens, "1.34.0", Some(55208), None),
+ /// Allows paths to enum variants on type aliases including `Self`.
+ (accepted, type_alias_enum_variants, "1.37.0", Some(49683), None),
+ /// Allows using `#[repr(align(X))]` on enums with equivalent semantics
+ /// to wrapping an enum in a wrapper struct with `#[repr(align(X))]`.
+ (accepted, repr_align_enum, "1.37.0", Some(57996), None),
+ /// Allows `const _: TYPE = VALUE`.
+ (accepted, underscore_const_names, "1.37.0", Some(54912), None),
+ /// Allows free and inherent `async fn`s, `async` blocks, and `<expr>.await` expressions.
+ (accepted, async_await, "1.39.0", Some(50547), None),
+ /// Allows mixing bind-by-move in patterns and references to those identifiers in guards.
+ (accepted, bind_by_move_pattern_guards, "1.39.0", Some(15287), None),
+ /// Allows attributes in formal function parameters.
+ (accepted, param_attrs, "1.39.0", Some(60406), None),
+ /// Allows macro invocations in `extern {}` blocks.
+ (accepted, macros_in_extern, "1.40.0", Some(49476), None),
+ /// Allows future-proofing enums/structs with the `#[non_exhaustive]` attribute (RFC 2008).
+ (accepted, non_exhaustive, "1.40.0", Some(44109), None),
+ /// Allows calling constructor functions in `const fn`.
+ (accepted, const_constructor, "1.40.0", Some(61456), None),
+ /// Allows the use of `#[cfg(doctest)]`, set when rustdoc is collecting doctests.
+ (accepted, cfg_doctest, "1.40.0", Some(62210), None),
+ /// Allows the `!` type. Does not imply 'exhaustive_patterns' any more.
+ (accepted, never_type, "1.41.0", Some(35121), None),
+ /// Allows relaxing the coherence rules such that
+ /// `impl<T> ForeignTrait<LocalType> for ForeignType<T>` is permitted.
+ (accepted, re_rebalance_coherence, "1.41.0", Some(55437), None),
+
+ // -------------------------------------------------------------------------
+ // feature-group-end: accepted features
+ // -------------------------------------------------------------------------
+);
--- /dev/null
+//! List of the active feature gates.
+
+use super::{State, Feature};
+
+use syntax_pos::edition::Edition;
+use syntax_pos::Span;
+use syntax_pos::symbol::{Symbol, sym};
+
+macro_rules! set {
+ ($field: ident) => {{
+ fn f(features: &mut Features, _: Span) {
+ features.$field = true;
+ }
+ f as fn(&mut Features, Span)
+ }}
+}
+
+macro_rules! declare_features {
+ ($(
+ $(#[doc = $doc:tt])* (active, $feature:ident, $ver:expr, $issue:expr, $edition:expr),
+ )+) => {
+ /// Represents active features that are currently being implemented or
+ /// currently being considered for addition/removal.
+ pub const ACTIVE_FEATURES:
+ &[Feature] =
+ &[$(
+ // (sym::$feature, $ver, $issue, $edition, set!($feature))
+ Feature {
+ state: State::Active { set: set!($feature) },
+ name: sym::$feature,
+ since: $ver,
+ issue: $issue,
+ edition: $edition,
+ description: concat!($($doc,)*),
+ }
+ ),+];
+
+ /// A set of features to be used by later passes.
+ #[derive(Clone)]
+ pub struct Features {
+ /// `#![feature]` attrs for language features, for error reporting.
+ pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>,
+ /// `#![feature]` attrs for non-language (library) features.
+ pub declared_lib_features: Vec<(Symbol, Span)>,
+ $(
+ $(#[doc = $doc])*
+ pub $feature: bool
+ ),+
+ }
+
+ impl Features {
+ pub fn new() -> Features {
+ Features {
+ declared_lang_features: Vec::new(),
+ declared_lib_features: Vec::new(),
+ $($feature: false),+
+ }
+ }
+
+ pub fn walk_feature_fields<F>(&self, mut f: F)
+ where F: FnMut(&str, bool)
+ {
+ $(f(stringify!($feature), self.$feature);)+
+ }
+ }
+ };
+}
+
+impl Feature {
+ /// Sets this feature in `Features`. Panics if called on a non-active feature.
+ pub fn set(&self, features: &mut Features, span: Span) {
+ match self.state {
+ State::Active { set } => set(features, span),
+ _ => panic!("called `set` on feature `{}` which is not `active`", self.name)
+ }
+ }
+}
+
+// If you change this, please modify `src/doc/unstable-book` as well.
+//
+// Don't ever remove anything from this list; move them to `removed.rs`.
+//
+// The version numbers here correspond to the version in which the current status
+// was set. This is most important for knowing when a particular feature became
+// stable (active).
+//
+// Note that the features are grouped into internal/user-facing and then
+// sorted by version inside those groups. This is enforced with tidy.
+//
+// N.B., `tools/tidy/src/features.rs` parses this information directly out of the
+// source, so take care when modifying it.
+
+declare_features! (
+ // -------------------------------------------------------------------------
+ // feature-group-start: internal feature gates
+ // -------------------------------------------------------------------------
+
+ // no-tracking-issue-start
+
+ /// Allows using compiler's own crates.
+ (active, rustc_private, "1.0.0", Some(27812), None),
+
+ /// Allows using the `rust-intrinsic`'s "ABI".
+ (active, intrinsics, "1.0.0", None, None),
+
+ /// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic.
+ (active, lang_items, "1.0.0", None, None),
+
+ /// Allows using the `#[stable]` and `#[unstable]` attributes.
+ (active, staged_api, "1.0.0", None, None),
+
+ /// Allows using `#[allow_internal_unstable]`. This is an
+ /// attribute on `macro_rules!` and can't use the attribute handling
+ /// below (it has to be checked before expansion possibly makes
+ /// macros disappear).
+ (active, allow_internal_unstable, "1.0.0", None, None),
+
+ /// Allows using `#[allow_internal_unsafe]`. This is an
+ /// attribute on `macro_rules!` and can't use the attribute handling
+ /// below (it has to be checked before expansion possibly makes
+ /// macros disappear).
+ (active, allow_internal_unsafe, "1.0.0", None, None),
+
+ /// Allows using `#[rustc_const_unstable(feature = "foo", ..)]` which
+ /// lets a function to be `const` when opted into with `#![feature(foo)]`.
+ (active, rustc_const_unstable, "1.0.0", None, None),
+
+ /// no-tracking-issue-end
+
+ /// Allows using `#[link_name="llvm.*"]`.
+ (active, link_llvm_intrinsics, "1.0.0", Some(29602), None),
+
+ /// Allows using `rustc_*` attributes (RFC 572).
+ (active, rustc_attrs, "1.0.0", Some(29642), None),
+
+ /// Allows using the `box $expr` syntax.
+ (active, box_syntax, "1.0.0", Some(49733), None),
+
+ /// Allows using `#[main]` to replace the entrypoint `#[lang = "start"]` calls.
+ (active, main, "1.0.0", Some(29634), None),
+
+ /// Allows using `#[start]` on a function indicating that it is the program entrypoint.
+ (active, start, "1.0.0", Some(29633), None),
+
+ /// Allows using the `#[fundamental]` attribute.
+ (active, fundamental, "1.0.0", Some(29635), None),
+
+ /// Allows using the `rust-call` ABI.
+ (active, unboxed_closures, "1.0.0", Some(29625), None),
+
+ /// Allows using the `#[linkage = ".."]` attribute.
+ (active, linkage, "1.0.0", Some(29603), None),
+
+ /// Allows features specific to OIBIT (auto traits).
+ (active, optin_builtin_traits, "1.0.0", Some(13231), None),
+
+ /// Allows using `box` in patterns (RFC 469).
+ (active, box_patterns, "1.0.0", Some(29641), None),
+
+ // no-tracking-issue-start
+
+ /// Allows using `#[prelude_import]` on glob `use` items.
+ (active, prelude_import, "1.2.0", None, None),
+
+ // no-tracking-issue-end
+
+ // no-tracking-issue-start
+
+ /// Allows using `#[omit_gdb_pretty_printer_section]`.
+ (active, omit_gdb_pretty_printer_section, "1.5.0", None, None),
+
+ /// Allows using the `vectorcall` ABI.
+ (active, abi_vectorcall, "1.7.0", None, None),
+
+ // no-tracking-issue-end
+
+ /// Allows using `#[structural_match]` which indicates that a type is structurally matchable.
+ (active, structural_match, "1.8.0", Some(31434), None),
+
+ /// Allows using the `may_dangle` attribute (RFC 1327).
+ (active, dropck_eyepatch, "1.10.0", Some(34761), None),
+
+ /// Allows using the `#![panic_runtime]` attribute.
+ (active, panic_runtime, "1.10.0", Some(32837), None),
+
+ /// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed.
+ (active, needs_panic_runtime, "1.10.0", Some(32837), None),
+
+ // no-tracking-issue-start
+
+ /// Allows identifying the `compiler_builtins` crate.
+ (active, compiler_builtins, "1.13.0", None, None),
+
+ /// Allows using the `unadjusted` ABI; perma-unstable.
+ (active, abi_unadjusted, "1.16.0", None, None),
+
+ /// Allows identifying crates that contain sanitizer runtimes.
+ (active, sanitizer_runtime, "1.17.0", None, None),
+
+ /// Used to identify crates that contain the profiler runtime.
+ (active, profiler_runtime, "1.18.0", None, None),
+
+ /// Allows using the `thiscall` ABI.
+ (active, abi_thiscall, "1.19.0", None, None),
+
+ /// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`.
+ (active, allocator_internals, "1.20.0", None, None),
+
+ /// Added for testing E0705; perma-unstable.
+ (active, test_2018_feature, "1.31.0", None, Some(Edition::Edition2018)),
+
+ // no-tracking-issue-end
+
+ // -------------------------------------------------------------------------
+ // feature-group-end: internal feature gates
+ // -------------------------------------------------------------------------
+
+ // -------------------------------------------------------------------------
+ // feature-group-start: actual feature gates (target features)
+ // -------------------------------------------------------------------------
+
+ // FIXME: Document these and merge with the list below.
+
+ // Unstable `#[target_feature]` directives.
+ (active, arm_target_feature, "1.27.0", Some(44839), None),
+ (active, aarch64_target_feature, "1.27.0", Some(44839), None),
+ (active, hexagon_target_feature, "1.27.0", Some(44839), None),
+ (active, powerpc_target_feature, "1.27.0", Some(44839), None),
+ (active, mips_target_feature, "1.27.0", Some(44839), None),
+ (active, avx512_target_feature, "1.27.0", Some(44839), None),
+ (active, mmx_target_feature, "1.27.0", Some(44839), None),
+ (active, sse4a_target_feature, "1.27.0", Some(44839), None),
+ (active, tbm_target_feature, "1.27.0", Some(44839), None),
+ (active, wasm_target_feature, "1.30.0", Some(44839), None),
+ (active, adx_target_feature, "1.32.0", Some(44839), None),
+ (active, cmpxchg16b_target_feature, "1.32.0", Some(44839), None),
+ (active, movbe_target_feature, "1.34.0", Some(44839), None),
+ (active, rtm_target_feature, "1.35.0", Some(44839), None),
+ (active, f16c_target_feature, "1.36.0", Some(44839), None),
+
+ // -------------------------------------------------------------------------
+ // feature-group-end: actual feature gates (target features)
+ // -------------------------------------------------------------------------
+
+ // -------------------------------------------------------------------------
+ // feature-group-start: actual feature gates
+ // -------------------------------------------------------------------------
+
+ /// Allows using the `#[link_args]` attribute.
+ (active, link_args, "1.0.0", Some(29596), None),
+
+ /// Allows defining identifiers beyond ASCII.
+ (active, non_ascii_idents, "1.0.0", Some(55467), None),
+
+ /// Allows using `#[plugin_registrar]` on functions.
+ (active, plugin_registrar, "1.0.0", Some(29597), None),
+
+ /// Allows using `#![plugin(myplugin)]`.
+ (active, plugin, "1.0.0", Some(29597), None),
+
+ /// Allows using `#[thread_local]` on `static` items.
+ (active, thread_local, "1.0.0", Some(29594), None),
+
+ /// Allows the use of SIMD types in functions declared in `extern` blocks.
+ (active, simd_ffi, "1.0.0", Some(27731), None),
+
+ /// Allows using non lexical lifetimes (RFC 2094).
+ (active, nll, "1.0.0", Some(43234), None),
+
+ /// Allows using slice patterns.
+ (active, slice_patterns, "1.0.0", Some(62254), None),
+
+ /// Allows the definition of `const` functions with some advanced features.
+ (active, const_fn, "1.2.0", Some(57563), None),
+
+ /// Allows associated type defaults.
+ (active, associated_type_defaults, "1.2.0", Some(29661), None),
+
+ /// Allows `#![no_core]`.
+ (active, no_core, "1.3.0", Some(29639), None),
+
+ /// Allows default type parameters to influence type inference.
+ (active, default_type_parameter_fallback, "1.3.0", Some(27336), None),
+
+ /// Allows `repr(simd)` and importing the various simd intrinsics.
+ (active, repr_simd, "1.4.0", Some(27731), None),
+
+ /// Allows `extern "platform-intrinsic" { ... }`.
+ (active, platform_intrinsics, "1.4.0", Some(27731), None),
+
+ /// Allows `#[unwind(..)]`.
+ ///
+ /// Permits specifying whether a function should permit unwinding or abort on unwind.
+ (active, unwind_attributes, "1.4.0", Some(58760), None),
+
+ /// Allows `#[no_debug]`.
+ (active, no_debug, "1.5.0", Some(29721), None),
+
+ /// Allows attributes on expressions and non-item statements.
+ (active, stmt_expr_attributes, "1.6.0", Some(15701), None),
+
+ /// Allows the use of type ascription in expressions.
+ (active, type_ascription, "1.6.0", Some(23416), None),
+
+ /// Allows `cfg(target_thread_local)`.
+ (active, cfg_target_thread_local, "1.7.0", Some(29594), None),
+
+ /// Allows specialization of implementations (RFC 1210).
+ (active, specialization, "1.7.0", Some(31844), None),
+
+ /// Allows using `#[naked]` on functions.
+ (active, naked_functions, "1.9.0", Some(32408), None),
+
+ /// Allows `cfg(target_has_atomic = "...")`.
+ (active, cfg_target_has_atomic, "1.9.0", Some(32976), 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 `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 `#[link(..., cfg(..))]`.
+ (active, link_cfg, "1.14.0", Some(37406), None),
+
+ /// Allows `extern "ptx-*" fn()`.
+ (active, abi_ptx, "1.15.0", Some(38788), None),
+
+ /// Allows the `#[repr(i128)]` attribute for enums.
+ (active, repr128, "1.16.0", Some(35118), None),
+
+ /// Allows `#[link(kind="static-nobundle"...)]`.
+ (active, static_nobundle, "1.16.0", Some(37403), None),
+
+ /// Allows `extern "msp430-interrupt" fn()`.
+ (active, abi_msp430_interrupt, "1.16.0", Some(38487), None),
+
+ /// Allows declarative macros 2.0 (`macro`).
+ (active, decl_macro, "1.17.0", Some(39412), None),
+
+ /// Allows `extern "x86-interrupt" fn()`.
+ (active, abi_x86_interrupt, "1.17.0", Some(40180), None),
+
+ /// Allows overlapping impls of marker traits.
+ (active, overlapping_marker_traits, "1.18.0", Some(29864), None),
+
+ /// Allows a test to fail without failing the whole suite.
+ (active, allow_fail, "1.19.0", Some(46488), None),
+
+ /// Allows unsized tuple coercion.
+ (active, unsized_tuple_coercion, "1.20.0", Some(42877), None),
+
+ /// Allows defining generators.
+ (active, generators, "1.21.0", Some(43122), None),
+
+ /// Allows `#[doc(cfg(...))]`.
+ (active, doc_cfg, "1.21.0", Some(43781), None),
+
+ /// Allows `#[doc(masked)]`.
+ (active, doc_masked, "1.21.0", Some(44027), None),
+
+ /// Allows `#[doc(spotlight)]`.
+ (active, doc_spotlight, "1.22.0", Some(45040), None),
+
+ /// Allows `#[doc(include = "some-file")]`.
+ (active, external_doc, "1.22.0", Some(44732), None),
+
+ /// Allows using `crate` as visibility modifier, synonymous with `pub(crate)`.
+ (active, crate_visibility_modifier, "1.23.0", Some(53120), None),
+
+ /// Allows defining `extern type`s.
+ (active, extern_types, "1.23.0", Some(43467), None),
+
+ /// Allows trait methods with arbitrary self types.
+ (active, arbitrary_self_types, "1.23.0", Some(44874), None),
+
+ /// Allows in-band quantification of lifetime bindings (e.g., `fn foo(x: &'a u8) -> &'a u8`).
+ (active, in_band_lifetimes, "1.23.0", Some(44524), None),
+
+ /// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598).
+ (active, generic_associated_types, "1.23.0", Some(44265), None),
+
+ /// Allows defining `trait X = A + B;` alias items.
+ (active, trait_alias, "1.24.0", Some(41517), None),
+
+ /// Allows infering `'static` outlives requirements (RFC 2093).
+ (active, infer_static_outlives_requirements, "1.26.0", Some(54185), None),
+
+ /// Allows accessing fields of unions inside `const` functions.
+ (active, const_fn_union, "1.27.0", Some(51909), None),
+
+ /// Allows casting raw pointers to `usize` during const eval.
+ (active, const_raw_ptr_to_usize_cast, "1.27.0", Some(51910), None),
+
+ /// Allows dereferencing raw pointers during const eval.
+ (active, const_raw_ptr_deref, "1.27.0", Some(51911), None),
+
+ /// Allows comparing raw pointers during const eval.
+ (active, const_compare_raw_pointers, "1.27.0", Some(53020), None),
+
+ /// Allows `#[doc(alias = "...")]`.
+ (active, doc_alias, "1.27.0", Some(50146), None),
+
+ /// Allows inconsistent bounds in where clauses.
+ (active, trivial_bounds, "1.28.0", Some(48214), None),
+
+ /// Allows `'a: { break 'a; }`.
+ (active, label_break_value, "1.28.0", Some(48594), None),
+
+ /// Allows using `#[doc(keyword = "...")]`.
+ (active, doc_keyword, "1.28.0", Some(51315), None),
+
+ /// Allows reinterpretation of the bits of a value of one type as another
+ /// type during const eval.
+ (active, const_transmute, "1.29.0", Some(53605), None),
+
+ /// Allows using `try {...}` expressions.
+ (active, try_blocks, "1.29.0", Some(31436), None),
+
+ /// Allows defining an `#[alloc_error_handler]`.
+ (active, alloc_error_handler, "1.29.0", Some(51540), None),
+
+ /// Allows using the `amdgpu-kernel` ABI.
+ (active, abi_amdgpu_kernel, "1.29.0", Some(51575), None),
+
+ /// Allows panicking during const eval (producing compile-time errors).
+ (active, const_panic, "1.30.0", Some(51999), None),
+
+ /// Allows `#[marker]` on certain traits allowing overlapping implementations.
+ (active, marker_trait_attr, "1.30.0", Some(29864), None),
+
+ /// Allows macro invocations on modules expressions and statements and
+ /// procedural macros to expand to non-items.
+ (active, proc_macro_hygiene, "1.30.0", Some(54727), None),
+
+ /// Allows unsized rvalues at arguments and parameters.
+ (active, unsized_locals, "1.30.0", Some(48055), None),
+
+ /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.
+ (active, custom_test_frameworks, "1.30.0", Some(50297), None),
+
+ /// Allows non-builtin attributes in inner attribute position.
+ (active, custom_inner_attributes, "1.30.0", Some(54726), None),
+
+ /// Allows `impl Trait` in bindings (`let`, `const`, `static`).
+ (active, impl_trait_in_bindings, "1.30.0", Some(63065), None),
+
+ /// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check.
+ (active, lint_reasons, "1.31.0", Some(54503), None),
+
+ /// Allows exhaustive integer pattern matching on `usize` and `isize`.
+ (active, precise_pointer_size_matching, "1.32.0", Some(56354), None),
+
+ /// Allows using `#[ffi_returns_twice]` on foreign functions.
+ (active, ffi_returns_twice, "1.34.0", Some(58314), None),
+
+ /// Allows const generic types (e.g. `struct Foo<const N: usize>(...);`).
+ (active, const_generics, "1.34.0", Some(44580), None),
+
+ /// Allows using `#[optimize(X)]`.
+ (active, optimize_attribute, "1.34.0", Some(54882), None),
+
+ /// Allows using C-variadics.
+ (active, c_variadic, "1.34.0", Some(44930), None),
+
+ /// Allows the user of associated type bounds.
+ (active, associated_type_bounds, "1.34.0", Some(52662), None),
+
+ /// Allows `if/while p && let q = r && ...` chains.
+ (active, let_chains, "1.37.0", Some(53667), None),
+
+ /// Allows #[repr(transparent)] on enums (RFC 2645).
+ (active, transparent_enums, "1.37.0", Some(60405), None),
+
+ /// Allows #[repr(transparent)] on unions (RFC 2645).
+ (active, transparent_unions, "1.37.0", Some(60405), None),
+
+ /// Allows explicit discriminants on non-unit enum variants.
+ (active, arbitrary_enum_discriminant, "1.37.0", Some(60553), None),
+
+ /// Allows `impl Trait` with multiple unrelated lifetimes.
+ (active, member_constraints, "1.37.0", Some(61977), None),
+
+ /// Allows `async || body` closures.
+ (active, async_closure, "1.37.0", Some(62290), None),
+
+ /// Allows `[x; N]` where `x` is a constant (RFC 2203).
+ (active, const_in_array_repeat_expressions, "1.37.0", Some(49147), 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 or-patterns (e.g., `0 | 1`).
+ (active, or_patterns, "1.38.0", Some(54883), None),
+
+ /// Allows the definition of `const extern fn` and `const unsafe extern fn`.
+ (active, const_extern_fn, "1.40.0", Some(64926), None),
+
+ /// Allows the use of raw-dylibs (RFC 2627).
+ (active, raw_dylib, "1.40.0", Some(58713), None),
+
+ /// Allows `#[track_caller]` to be used which provides
+ /// accurate caller location reporting during panic (RFC 2091).
+ (active, track_caller, "1.40.0", Some(47809), 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 the `efiapi` ABI.
+ (active, abi_efiapi, "1.40.0", Some(65815), None),
+
+ /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.
+ (active, raw_ref_op, "1.41.0", Some(64490), None),
+
+ /// Allows diverging expressions to fall back to `!` rather than `()`.
+ (active, never_type_fallback, "1.41.0", Some(65992), 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 use of `if` and `match` in constants.
+ (active, const_if_match, "1.41.0", Some(49146), None),
+
+ // -------------------------------------------------------------------------
+ // feature-group-end: actual feature gates
+ // -------------------------------------------------------------------------
+);
+
+/// Some features are known to be incomplete and using them is likely to have
+/// unanticipated results, such as compiler crashes. We warn the user about these
+/// to alert them.
+pub const INCOMPLETE_FEATURES: &[Symbol] = &[
+ sym::impl_trait_in_bindings,
+ sym::generic_associated_types,
+ sym::const_generics,
+ sym::or_patterns,
+ sym::let_chains,
+ sym::raw_dylib,
+ sym::track_caller,
+];
--- /dev/null
+//! # Feature gating
+//!
+//! This module implements the gating necessary for preventing certain compiler
+//! features from being used by default. This module will crawl a pre-expanded
+//! AST to ensure that there are no features which are used that are not
+//! enabled.
+//!
+//! Features are enabled in programs via the crate-level attributes of
+//! `#![feature(...)]` with a comma-separated list of features.
+//!
+//! For the purpose of future feature-tracking, once code for detection of feature
+//! gate usage is added, *do not remove it again* even once the feature
+//! becomes stable.
+
+mod accepted;
+mod removed;
+mod active;
+
+use std::fmt;
+use std::num::NonZeroU32;
+use syntax_pos::{Span, edition::Edition, symbol::Symbol};
+
+#[derive(Clone, Copy)]
+pub enum State {
+ Accepted,
+ Active { set: fn(&mut Features, Span) },
+ Removed { reason: Option<&'static str> },
+ Stabilized { reason: Option<&'static str> },
+}
+
+impl fmt::Debug for State {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ State::Accepted { .. } => write!(f, "accepted"),
+ State::Active { .. } => write!(f, "active"),
+ State::Removed { .. } => write!(f, "removed"),
+ State::Stabilized { .. } => write!(f, "stabilized"),
+ }
+ }
+}
+
+#[derive(Debug, Clone)]
+pub struct Feature {
+ pub state: State,
+ pub name: Symbol,
+ pub since: &'static str,
+ issue: Option<u32>, // FIXME: once #58732 is done make this an Option<NonZeroU32>
+ pub edition: Option<Edition>,
+ description: &'static str,
+}
+
+impl Feature {
+ // FIXME(Centril): privatize again.
+ pub fn issue(&self) -> Option<NonZeroU32> {
+ self.issue.and_then(|i| NonZeroU32::new(i))
+ }
+}
+
+pub use accepted::ACCEPTED_FEATURES;
+pub use active::{ACTIVE_FEATURES, Features, INCOMPLETE_FEATURES};
+pub use removed::{REMOVED_FEATURES, STABLE_REMOVED_FEATURES};
--- /dev/null
+//! List of the removed feature gates.
+
+use super::{State, Feature};
+use syntax_pos::symbol::sym;
+
+macro_rules! declare_features {
+ ($(
+ $(#[doc = $doc:tt])* (removed, $feature:ident, $ver:expr, $issue:expr, None, $reason:expr),
+ )+) => {
+ /// Represents unstable features which have since been removed (it was once Active)
+ pub const REMOVED_FEATURES: &[Feature] = &[
+ $(
+ Feature {
+ state: State::Removed { reason: $reason },
+ name: sym::$feature,
+ since: $ver,
+ issue: $issue,
+ edition: None,
+ description: concat!($($doc,)*),
+ }
+ ),+
+ ];
+ };
+
+ ($(
+ $(#[doc = $doc:tt])* (stable_removed, $feature:ident, $ver:expr, $issue:expr, None),
+ )+) => {
+ /// Represents stable features which have since been removed (it was once Accepted)
+ pub const STABLE_REMOVED_FEATURES: &[Feature] = &[
+ $(
+ Feature {
+ state: State::Stabilized { reason: None },
+ name: sym::$feature,
+ since: $ver,
+ issue: $issue,
+ edition: None,
+ description: concat!($($doc,)*),
+ }
+ ),+
+ ];
+ };
+}
+
+declare_features! (
+ // -------------------------------------------------------------------------
+ // feature-group-start: removed features
+ // -------------------------------------------------------------------------
+
+ (removed, import_shadowing, "1.0.0", None, None, None),
+ (removed, managed_boxes, "1.0.0", None, None, None),
+ /// Allows use of unary negate on unsigned integers, e.g., -e for e: u8
+ (removed, negate_unsigned, "1.0.0", Some(29645), None, None),
+ (removed, reflect, "1.0.0", Some(27749), None, None),
+ /// A way to temporarily opt out of opt in copy. This will *never* be accepted.
+ (removed, opt_out_copy, "1.0.0", None, None, None),
+ (removed, quad_precision_float, "1.0.0", None, None, None),
+ (removed, struct_inherit, "1.0.0", None, None, None),
+ (removed, test_removed_feature, "1.0.0", None, None, None),
+ (removed, visible_private_types, "1.0.0", None, None, None),
+ (removed, unsafe_no_drop_flag, "1.0.0", None, None, None),
+ /// Allows using items which are missing stability attributes
+ (removed, unmarked_api, "1.0.0", None, None, None),
+ (removed, allocator, "1.0.0", None, None, None),
+ (removed, simd, "1.0.0", Some(27731), None,
+ Some("removed in favor of `#[repr(simd)]`")),
+ (removed, advanced_slice_patterns, "1.0.0", Some(62254), None,
+ Some("merged into `#![feature(slice_patterns)]`")),
+ (removed, macro_reexport, "1.0.0", Some(29638), None,
+ Some("subsumed by `pub use`")),
+ /// Allows using custom attributes (RFC 572).
+ (removed, custom_attribute, "1.0.0", Some(29642), None,
+ Some("removed in favor of `#![register_tool]` and `#![register_attr]`")),
+ (removed, pushpop_unsafe, "1.2.0", None, None, None),
+ (removed, needs_allocator, "1.4.0", Some(27389), None,
+ Some("subsumed by `#![feature(allocator_internals)]`")),
+ (removed, proc_macro_mod, "1.27.0", Some(54727), None,
+ Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
+ (removed, proc_macro_expr, "1.27.0", Some(54727), None,
+ Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
+ (removed, proc_macro_non_items, "1.27.0", Some(54727), None,
+ Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
+ (removed, proc_macro_gen, "1.27.0", Some(54727), None,
+ Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
+ (removed, panic_implementation, "1.28.0", Some(44489), None,
+ Some("subsumed by `#[panic_handler]`")),
+ /// Allows the use of `#[derive(Anything)]` as sugar for `#[derive_Anything]`.
+ (removed, custom_derive, "1.32.0", Some(29644), None,
+ Some("subsumed by `#[proc_macro_derive]`")),
+ /// Paths of the form: `extern::foo::bar`
+ (removed, extern_in_paths, "1.33.0", Some(55600), None,
+ Some("subsumed by `::foo::bar` paths")),
+ (removed, quote, "1.33.0", Some(29601), None, None),
+ /// Allows using `#[unsafe_destructor_blind_to_params]` (RFC 1238).
+ (removed, dropck_parametricity, "1.38.0", Some(28498), None, None),
+ (removed, await_macro, "1.38.0", Some(50547), None,
+ Some("subsumed by `.await` syntax")),
+ /// Allows defining `existential type`s.
+ (removed, existential_type, "1.38.0", Some(63063), None,
+ Some("removed in favor of `#![feature(type_alias_impl_trait)]`")),
+ /// Allows using the macros:
+ /// + `__diagnostic_used`
+ /// + `__register_diagnostic`
+ /// +`__build_diagnostic_array`
+ (removed, rustc_diagnostic_macros, "1.38.0", None, None, None),
+ /// Allows using `#[on_unimplemented(..)]` on traits.
+ /// (Moved to `rustc_attrs`.)
+ (removed, on_unimplemented, "1.40.0", None, None, None),
+
+ // -------------------------------------------------------------------------
+ // feature-group-end: removed features
+ // -------------------------------------------------------------------------
+);
+
+declare_features! (
+ (stable_removed, no_stack_check, "1.0.0", None, None),
+);
syntax = { path = "../libsyntax" }
syntax_pos = { path = "../libsyntax_pos" }
rustc_data_structures = { path = "../librustc_data_structures" }
+rustc_feature = { path = "../librustc_feature" }
rustc_index = { path = "../librustc_index" }
rustc_error_codes = { path = "../librustc_error_codes" }
use syntax::attr::{self, HasAttrs, AttributeTemplate};
use syntax::source_map::Spanned;
use syntax::edition::Edition;
-use syntax::feature_gate::{self, AttributeGate, AttributeType};
+use syntax::feature_gate::{AttributeGate, AttributeType};
use syntax::feature_gate::{Stability, deprecated_attributes};
use syntax_pos::{BytePos, Span};
use syntax::symbol::{Symbol, kw, sym};
features.declared_lang_features
.iter().map(|(name, span, _)| (name, span))
.chain(features.declared_lib_features.iter().map(|(name, span)| (name, span)))
- .filter(|(name, _)| feature_gate::INCOMPLETE_FEATURES.iter().any(|f| name == &f))
+ .filter(|(name, _)| rustc_feature::INCOMPLETE_FEATURES.iter().any(|f| name == &f))
.for_each(|(name, &span)| {
cx.struct_span_lint(
INCOMPLETE_FEATURES,
syntax = { path = "../libsyntax" }
errors = { path = "../librustc_errors", package = "rustc_errors" }
rustc_data_structures = { path = "../librustc_data_structures" }
+rustc_feature = { path = "../librustc_feature" }
rustc_lexer = { path = "../librustc_lexer" }
rustc_target = { path = "../librustc_target" }
smallvec = { version = "1.0", features = ["union", "may_dangle"] }
//! [#64197]: https://github.com/rust-lang/rust/issues/64197
use crate::validate_attr;
+use rustc_feature::Features;
use syntax::attr::HasAttrs;
use syntax::feature_gate::{
feature_err,
EXPLAIN_STMT_ATTR_SYNTAX,
- Features,
get_features,
GateIssue,
};
log = "0.4"
rustc = { path = "../librustc" }
rustc_data_structures = { path = "../librustc_data_structures" }
+rustc_feature = { path = "../librustc_feature" }
rustc_index = { path = "../librustc_index" }
rustc_parse = { path = "../librustc_parse" }
rustc_target = { path = "../librustc_target" }
use rustc::hir;
use rustc::ty::TyCtxt;
use rustc::ty::query::Providers;
+use rustc_feature::Features;
use syntax::ast::Mutability;
-use syntax::feature_gate::{emit_feature_err, Features, GateIssue};
+use syntax::feature_gate::{emit_feature_err, GateIssue};
use syntax::span_err;
use syntax_pos::{sym, Span};
use rustc_error_codes::*;
use std::fmt::{self, Write};
use std::ops;
+use rustc_feature::Features;
use syntax::symbol::{Symbol, sym};
use syntax::ast::{MetaItem, MetaItemKind, NestedMetaItem, LitKind};
use syntax::sess::ParseSess;
-use syntax::feature_gate::Features;
use syntax_pos::Span;
extern crate rustc;
extern crate rustc_data_structures;
extern crate rustc_driver;
+extern crate rustc_feature;
extern crate rustc_error_codes;
extern crate rustc_index;
extern crate rustc_resolve;
syntax_pos = { path = "../libsyntax_pos" }
errors = { path = "../librustc_errors", package = "rustc_errors" }
rustc_data_structures = { path = "../librustc_data_structures" }
+rustc_feature = { path = "../librustc_feature" }
rustc_index = { path = "../librustc_index" }
rustc_lexer = { path = "../librustc_lexer" }
rustc_macros = { path = "../librustc_macros" }
//! Parsing and validation of builtin attributes
use crate::ast::{self, Attribute, MetaItem, NestedMetaItem};
-use crate::feature_gate::{Features, GatedCfg};
use crate::print::pprust;
+use crate::feature_gate::GatedCfg;
use crate::sess::ParseSess;
use errors::{Applicability, Handler};
use std::num::NonZeroU32;
use syntax_pos::hygiene::Transparency;
use syntax_pos::{symbol::Symbol, symbol::sym, Span};
+use rustc_feature::Features;
use rustc_macros::HashStable_Generic;
use super::{mark_used, MetaItemKind};
+++ /dev/null
-//! List of the accepted feature gates.
-
-use crate::symbol::sym;
-use super::{State, Feature};
-
-macro_rules! declare_features {
- ($(
- $(#[doc = $doc:tt])* (accepted, $feature:ident, $ver:expr, $issue:expr, None),
- )+) => {
- /// Those language feature has since been Accepted (it was once Active)
- pub const ACCEPTED_FEATURES: &[Feature] = &[
- $(
- Feature {
- state: State::Accepted,
- name: sym::$feature,
- since: $ver,
- issue: $issue,
- edition: None,
- description: concat!($($doc,)*),
- }
- ),+
- ];
- }
-}
-
-declare_features! (
- // -------------------------------------------------------------------------
- // feature-group-start: for testing purposes
- // -------------------------------------------------------------------------
-
- /// A temporary feature gate used to enable parser extensions needed
- /// to bootstrap fix for #5723.
- (accepted, issue_5723_bootstrap, "1.0.0", None, None),
- /// These are used to test this portion of the compiler,
- /// they don't actually mean anything.
- (accepted, test_accepted_feature, "1.0.0", None, None),
-
- // -------------------------------------------------------------------------
- // feature-group-end: for testing purposes
- // -------------------------------------------------------------------------
-
- // -------------------------------------------------------------------------
- // feature-group-start: accepted features
- // -------------------------------------------------------------------------
-
- /// Allows using associated `type`s in `trait`s.
- (accepted, associated_types, "1.0.0", None, None),
- /// Allows using assigning a default type to type parameters in algebraic data type definitions.
- (accepted, default_type_params, "1.0.0", None, None),
- // FIXME: explain `globs`.
- (accepted, globs, "1.0.0", None, None),
- /// Allows `macro_rules!` items.
- (accepted, macro_rules, "1.0.0", None, None),
- /// Allows use of `&foo[a..b]` as a slicing syntax.
- (accepted, slicing_syntax, "1.0.0", None, None),
- /// Allows struct variants `Foo { baz: u8, .. }` in enums (RFC 418).
- (accepted, struct_variant, "1.0.0", None, None),
- /// Allows indexing tuples.
- (accepted, tuple_indexing, "1.0.0", None, None),
- /// Allows the use of `if let` expressions.
- (accepted, if_let, "1.0.0", None, None),
- /// Allows the use of `while let` expressions.
- (accepted, while_let, "1.0.0", None, None),
- /// Allows using `#![no_std]`.
- (accepted, no_std, "1.6.0", None, None),
- /// Allows overloading augmented assignment operations like `a += b`.
- (accepted, augmented_assignments, "1.8.0", Some(28235), None),
- /// Allows empty structs and enum variants with braces.
- (accepted, braced_empty_structs, "1.8.0", Some(29720), None),
- /// Allows `#[deprecated]` attribute.
- (accepted, deprecated, "1.9.0", Some(29935), None),
- /// Allows macros to appear in the type position.
- (accepted, type_macros, "1.13.0", Some(27245), None),
- /// Allows use of the postfix `?` operator in expressions.
- (accepted, question_mark, "1.13.0", Some(31436), None),
- /// Allows `..` in tuple (struct) patterns.
- (accepted, dotdot_in_tuple_patterns, "1.14.0", Some(33627), None),
- /// Allows some increased flexibility in the name resolution rules,
- /// especially around globs and shadowing (RFC 1560).
- (accepted, item_like_imports, "1.15.0", Some(35120), None),
- /// Allows using `Self` and associated types in struct expressions and patterns.
- (accepted, more_struct_aliases, "1.16.0", Some(37544), None),
- /// Allows elision of `'static` lifetimes in `static`s and `const`s.
- (accepted, static_in_const, "1.17.0", Some(35897), None),
- /// Allows field shorthands (`x` meaning `x: x`) in struct literal expressions.
- (accepted, field_init_shorthand, "1.17.0", Some(37340), None),
- /// Allows the definition recursive static items.
- (accepted, static_recursion, "1.17.0", Some(29719), None),
- /// Allows `pub(restricted)` visibilities (RFC 1422).
- (accepted, pub_restricted, "1.18.0", Some(32409), None),
- /// Allows `#![windows_subsystem]`.
- (accepted, windows_subsystem, "1.18.0", Some(37499), None),
- /// Allows `break {expr}` with a value inside `loop`s.
- (accepted, loop_break_value, "1.19.0", Some(37339), None),
- /// Allows numeric fields in struct expressions and patterns.
- (accepted, relaxed_adts, "1.19.0", Some(35626), None),
- /// Allows coercing non capturing closures to function pointers.
- (accepted, closure_to_fn_coercion, "1.19.0", Some(39817), None),
- /// Allows attributes on struct literal fields.
- (accepted, struct_field_attributes, "1.20.0", Some(38814), None),
- /// Allows the definition of associated constants in `trait` or `impl` blocks.
- (accepted, associated_consts, "1.20.0", Some(29646), None),
- /// Allows usage of the `compile_error!` macro.
- (accepted, compile_error, "1.20.0", Some(40872), None),
- /// Allows code like `let x: &'static u32 = &42` to work (RFC 1414).
- (accepted, rvalue_static_promotion, "1.21.0", Some(38865), None),
- /// Allows `Drop` types in constants (RFC 1440).
- (accepted, drop_types_in_const, "1.22.0", Some(33156), None),
- /// Allows the sysV64 ABI to be specified on all platforms
- /// instead of just the platforms on which it is the C ABI.
- (accepted, abi_sysv64, "1.24.0", Some(36167), None),
- /// Allows `repr(align(16))` struct attribute (RFC 1358).
- (accepted, repr_align, "1.25.0", Some(33626), None),
- /// Allows '|' at beginning of match arms (RFC 1925).
- (accepted, match_beginning_vert, "1.25.0", Some(44101), None),
- /// Allows nested groups in `use` items (RFC 2128).
- (accepted, use_nested_groups, "1.25.0", Some(44494), None),
- /// Allows indexing into constant arrays.
- (accepted, const_indexing, "1.26.0", Some(29947), None),
- /// Allows using `a..=b` and `..=b` as inclusive range syntaxes.
- (accepted, inclusive_range_syntax, "1.26.0", Some(28237), None),
- /// Allows `..=` in patterns (RFC 1192).
- (accepted, dotdoteq_in_patterns, "1.26.0", Some(28237), None),
- /// Allows `fn main()` with return types which implements `Termination` (RFC 1937).
- (accepted, termination_trait, "1.26.0", Some(43301), None),
- /// Allows implementing `Clone` for closures where possible (RFC 2132).
- (accepted, clone_closures, "1.26.0", Some(44490), None),
- /// Allows implementing `Copy` for closures where possible (RFC 2132).
- (accepted, copy_closures, "1.26.0", Some(44490), None),
- /// Allows `impl Trait` in function arguments.
- (accepted, universal_impl_trait, "1.26.0", Some(34511), None),
- /// Allows `impl Trait` in function return types.
- (accepted, conservative_impl_trait, "1.26.0", Some(34511), None),
- /// Allows using the `u128` and `i128` types.
- (accepted, i128_type, "1.26.0", Some(35118), None),
- /// Allows default match binding modes (RFC 2005).
- (accepted, match_default_bindings, "1.26.0", Some(42640), None),
- /// Allows `'_` placeholder lifetimes.
- (accepted, underscore_lifetimes, "1.26.0", Some(44524), None),
- /// Allows attributes on lifetime/type formal parameters in generics (RFC 1327).
- (accepted, generic_param_attrs, "1.27.0", Some(48848), None),
- /// Allows `cfg(target_feature = "...")`.
- (accepted, cfg_target_feature, "1.27.0", Some(29717), None),
- /// Allows `#[target_feature(...)]`.
- (accepted, target_feature, "1.27.0", None, None),
- /// Allows using `dyn Trait` as a syntax for trait objects.
- (accepted, dyn_trait, "1.27.0", Some(44662), None),
- /// Allows `#[must_use]` on functions, and introduces must-use operators (RFC 1940).
- (accepted, fn_must_use, "1.27.0", Some(43302), None),
- /// Allows use of the `:lifetime` macro fragment specifier.
- (accepted, macro_lifetime_matcher, "1.27.0", Some(34303), None),
- /// Allows `#[test]` functions where the return type implements `Termination` (RFC 1937).
- (accepted, termination_trait_test, "1.27.0", Some(48854), None),
- /// Allows the `#[global_allocator]` attribute.
- (accepted, global_allocator, "1.28.0", Some(27389), None),
- /// Allows `#[repr(transparent)]` attribute on newtype structs.
- (accepted, repr_transparent, "1.28.0", Some(43036), None),
- /// Allows procedural macros in `proc-macro` crates.
- (accepted, proc_macro, "1.29.0", Some(38356), None),
- /// Allows `foo.rs` as an alternative to `foo/mod.rs`.
- (accepted, non_modrs_mods, "1.30.0", Some(44660), None),
- /// Allows use of the `:vis` macro fragment specifier
- (accepted, macro_vis_matcher, "1.30.0", Some(41022), None),
- /// Allows importing and reexporting macros with `use`,
- /// enables macro modularization in general.
- (accepted, use_extern_macros, "1.30.0", Some(35896), None),
- /// Allows keywords to be escaped for use as identifiers.
- (accepted, raw_identifiers, "1.30.0", Some(48589), None),
- /// Allows attributes scoped to tools.
- (accepted, tool_attributes, "1.30.0", Some(44690), None),
- /// Allows multi-segment paths in attributes and derives.
- (accepted, proc_macro_path_invoc, "1.30.0", Some(38356), None),
- /// Allows all literals in attribute lists and values of key-value pairs.
- (accepted, attr_literals, "1.30.0", Some(34981), None),
- /// Allows inferring outlives requirements (RFC 2093).
- (accepted, infer_outlives_requirements, "1.30.0", Some(44493), None),
- /// Allows annotating functions conforming to `fn(&PanicInfo) -> !` with `#[panic_handler]`.
- /// This defines the behavior of panics.
- (accepted, panic_handler, "1.30.0", Some(44489), None),
- /// Allows `#[used]` to preserve symbols (see llvm.used).
- (accepted, used, "1.30.0", Some(40289), None),
- /// Allows `crate` in paths.
- (accepted, crate_in_paths, "1.30.0", Some(45477), None),
- /// Allows resolving absolute paths as paths from other crates.
- (accepted, extern_absolute_paths, "1.30.0", Some(44660), None),
- /// Allows access to crate names passed via `--extern` through prelude.
- (accepted, extern_prelude, "1.30.0", Some(44660), None),
- /// Allows parentheses in patterns.
- (accepted, pattern_parentheses, "1.31.0", Some(51087), None),
- /// Allows the definition of `const fn` functions.
- (accepted, min_const_fn, "1.31.0", Some(53555), None),
- /// Allows scoped lints.
- (accepted, tool_lints, "1.31.0", Some(44690), None),
- /// Allows lifetime elision in `impl` headers. For example:
- /// + `impl<I:Iterator> Iterator for &mut Iterator`
- /// + `impl Debug for Foo<'_>`
- (accepted, impl_header_lifetime_elision, "1.31.0", Some(15872), None),
- /// Allows `extern crate foo as bar;`. This puts `bar` into extern prelude.
- (accepted, extern_crate_item_prelude, "1.31.0", Some(55599), None),
- /// Allows use of the `:literal` macro fragment specifier (RFC 1576).
- (accepted, macro_literal_matcher, "1.32.0", Some(35625), None),
- /// Allows use of `?` as the Kleene "at most one" operator in macros.
- (accepted, macro_at_most_once_rep, "1.32.0", Some(48075), None),
- /// Allows `Self` struct constructor (RFC 2302).
- (accepted, self_struct_ctor, "1.32.0", Some(51994), None),
- /// Allows `Self` in type definitions (RFC 2300).
- (accepted, self_in_typedefs, "1.32.0", Some(49303), None),
- /// Allows `use x::y;` to search `x` in the current scope.
- (accepted, uniform_paths, "1.32.0", Some(53130), None),
- /// Allows integer match exhaustiveness checking (RFC 2591).
- (accepted, exhaustive_integer_patterns, "1.33.0", Some(50907), None),
- /// Allows `use path as _;` and `extern crate c as _;`.
- (accepted, underscore_imports, "1.33.0", Some(48216), None),
- /// Allows `#[repr(packed(N))]` attribute on structs.
- (accepted, repr_packed, "1.33.0", Some(33158), None),
- /// Allows irrefutable patterns in `if let` and `while let` statements (RFC 2086).
- (accepted, irrefutable_let_patterns, "1.33.0", Some(44495), None),
- /// Allows calling `const unsafe fn` inside `unsafe` blocks in `const fn` functions.
- (accepted, min_const_unsafe_fn, "1.33.0", Some(55607), None),
- /// Allows let bindings, assignments and destructuring in `const` functions and constants.
- /// As long as control flow is not implemented in const eval, `&&` and `||` may not be used
- /// at the same time as let bindings.
- (accepted, const_let, "1.33.0", Some(48821), None),
- /// Allows `#[cfg_attr(predicate, multiple, attributes, here)]`.
- (accepted, cfg_attr_multi, "1.33.0", Some(54881), None),
- /// Allows top level or-patterns (`p | q`) in `if let` and `while let`.
- (accepted, if_while_or_patterns, "1.33.0", Some(48215), None),
- /// Allows `cfg(target_vendor = "...")`.
- (accepted, cfg_target_vendor, "1.33.0", Some(29718), None),
- /// Allows `extern crate self as foo;`.
- /// This puts local crate root into extern prelude under name `foo`.
- (accepted, extern_crate_self, "1.34.0", Some(56409), None),
- /// Allows arbitrary delimited token streams in non-macro attributes.
- (accepted, unrestricted_attribute_tokens, "1.34.0", Some(55208), None),
- /// Allows paths to enum variants on type aliases including `Self`.
- (accepted, type_alias_enum_variants, "1.37.0", Some(49683), None),
- /// Allows using `#[repr(align(X))]` on enums with equivalent semantics
- /// to wrapping an enum in a wrapper struct with `#[repr(align(X))]`.
- (accepted, repr_align_enum, "1.37.0", Some(57996), None),
- /// Allows `const _: TYPE = VALUE`.
- (accepted, underscore_const_names, "1.37.0", Some(54912), None),
- /// Allows free and inherent `async fn`s, `async` blocks, and `<expr>.await` expressions.
- (accepted, async_await, "1.39.0", Some(50547), None),
- /// Allows mixing bind-by-move in patterns and references to those identifiers in guards.
- (accepted, bind_by_move_pattern_guards, "1.39.0", Some(15287), None),
- /// Allows attributes in formal function parameters.
- (accepted, param_attrs, "1.39.0", Some(60406), None),
- /// Allows macro invocations in `extern {}` blocks.
- (accepted, macros_in_extern, "1.40.0", Some(49476), None),
- /// Allows future-proofing enums/structs with the `#[non_exhaustive]` attribute (RFC 2008).
- (accepted, non_exhaustive, "1.40.0", Some(44109), None),
- /// Allows calling constructor functions in `const fn`.
- (accepted, const_constructor, "1.40.0", Some(61456), None),
- /// Allows the use of `#[cfg(doctest)]`, set when rustdoc is collecting doctests.
- (accepted, cfg_doctest, "1.40.0", Some(62210), None),
- /// Allows the `!` type. Does not imply 'exhaustive_patterns' any more.
- (accepted, never_type, "1.41.0", Some(35121), None),
- /// Allows relaxing the coherence rules such that
- /// `impl<T> ForeignTrait<LocalType> for ForeignType<T>` is permitted.
- (accepted, re_rebalance_coherence, "1.41.0", Some(55437), None),
-
- // -------------------------------------------------------------------------
- // feature-group-end: accepted features
- // -------------------------------------------------------------------------
-);
+++ /dev/null
-//! List of the active feature gates.
-
-use super::{State, Feature};
-
-use crate::edition::Edition;
-use crate::symbol::{Symbol, sym};
-
-use syntax_pos::Span;
-
-macro_rules! set {
- ($field: ident) => {{
- fn f(features: &mut Features, _: Span) {
- features.$field = true;
- }
- f as fn(&mut Features, Span)
- }}
-}
-
-macro_rules! declare_features {
- ($(
- $(#[doc = $doc:tt])* (active, $feature:ident, $ver:expr, $issue:expr, $edition:expr),
- )+) => {
- /// Represents active features that are currently being implemented or
- /// currently being considered for addition/removal.
- pub const ACTIVE_FEATURES:
- &[Feature] =
- &[$(
- // (sym::$feature, $ver, $issue, $edition, set!($feature))
- Feature {
- state: State::Active { set: set!($feature) },
- name: sym::$feature,
- since: $ver,
- issue: $issue,
- edition: $edition,
- description: concat!($($doc,)*),
- }
- ),+];
-
- /// A set of features to be used by later passes.
- #[derive(Clone)]
- pub struct Features {
- /// `#![feature]` attrs for language features, for error reporting.
- pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>,
- /// `#![feature]` attrs for non-language (library) features.
- pub declared_lib_features: Vec<(Symbol, Span)>,
- $(
- $(#[doc = $doc])*
- pub $feature: bool
- ),+
- }
-
- impl Features {
- pub fn new() -> Features {
- Features {
- declared_lang_features: Vec::new(),
- declared_lib_features: Vec::new(),
- $($feature: false),+
- }
- }
-
- pub fn walk_feature_fields<F>(&self, mut f: F)
- where F: FnMut(&str, bool)
- {
- $(f(stringify!($feature), self.$feature);)+
- }
- }
- };
-}
-
-impl Feature {
- /// Sets this feature in `Features`. Panics if called on a non-active feature.
- pub fn set(&self, features: &mut Features, span: Span) {
- match self.state {
- State::Active { set } => set(features, span),
- _ => panic!("called `set` on feature `{}` which is not `active`", self.name)
- }
- }
-}
-
-// If you change this, please modify `src/doc/unstable-book` as well.
-//
-// Don't ever remove anything from this list; move them to `removed.rs`.
-//
-// The version numbers here correspond to the version in which the current status
-// was set. This is most important for knowing when a particular feature became
-// stable (active).
-//
-// Note that the features are grouped into internal/user-facing and then
-// sorted by version inside those groups. This is enforced with tidy.
-//
-// N.B., `tools/tidy/src/features.rs` parses this information directly out of the
-// source, so take care when modifying it.
-
-declare_features! (
- // -------------------------------------------------------------------------
- // feature-group-start: internal feature gates
- // -------------------------------------------------------------------------
-
- // no-tracking-issue-start
-
- /// Allows using compiler's own crates.
- (active, rustc_private, "1.0.0", Some(27812), None),
-
- /// Allows using the `rust-intrinsic`'s "ABI".
- (active, intrinsics, "1.0.0", None, None),
-
- /// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic.
- (active, lang_items, "1.0.0", None, None),
-
- /// Allows using the `#[stable]` and `#[unstable]` attributes.
- (active, staged_api, "1.0.0", None, None),
-
- /// Allows using `#[allow_internal_unstable]`. This is an
- /// attribute on `macro_rules!` and can't use the attribute handling
- /// below (it has to be checked before expansion possibly makes
- /// macros disappear).
- (active, allow_internal_unstable, "1.0.0", None, None),
-
- /// Allows using `#[allow_internal_unsafe]`. This is an
- /// attribute on `macro_rules!` and can't use the attribute handling
- /// below (it has to be checked before expansion possibly makes
- /// macros disappear).
- (active, allow_internal_unsafe, "1.0.0", None, None),
-
- /// Allows using `#[rustc_const_unstable(feature = "foo", ..)]` which
- /// lets a function to be `const` when opted into with `#![feature(foo)]`.
- (active, rustc_const_unstable, "1.0.0", None, None),
-
- /// no-tracking-issue-end
-
- /// Allows using `#[link_name="llvm.*"]`.
- (active, link_llvm_intrinsics, "1.0.0", Some(29602), None),
-
- /// Allows using `rustc_*` attributes (RFC 572).
- (active, rustc_attrs, "1.0.0", Some(29642), None),
-
- /// Allows using the `box $expr` syntax.
- (active, box_syntax, "1.0.0", Some(49733), None),
-
- /// Allows using `#[main]` to replace the entrypoint `#[lang = "start"]` calls.
- (active, main, "1.0.0", Some(29634), None),
-
- /// Allows using `#[start]` on a function indicating that it is the program entrypoint.
- (active, start, "1.0.0", Some(29633), None),
-
- /// Allows using the `#[fundamental]` attribute.
- (active, fundamental, "1.0.0", Some(29635), None),
-
- /// Allows using the `rust-call` ABI.
- (active, unboxed_closures, "1.0.0", Some(29625), None),
-
- /// Allows using the `#[linkage = ".."]` attribute.
- (active, linkage, "1.0.0", Some(29603), None),
-
- /// Allows features specific to OIBIT (auto traits).
- (active, optin_builtin_traits, "1.0.0", Some(13231), None),
-
- /// Allows using `box` in patterns (RFC 469).
- (active, box_patterns, "1.0.0", Some(29641), None),
-
- // no-tracking-issue-start
-
- /// Allows using `#[prelude_import]` on glob `use` items.
- (active, prelude_import, "1.2.0", None, None),
-
- // no-tracking-issue-end
-
- // no-tracking-issue-start
-
- /// Allows using `#[omit_gdb_pretty_printer_section]`.
- (active, omit_gdb_pretty_printer_section, "1.5.0", None, None),
-
- /// Allows using the `vectorcall` ABI.
- (active, abi_vectorcall, "1.7.0", None, None),
-
- // no-tracking-issue-end
-
- /// Allows using `#[structural_match]` which indicates that a type is structurally matchable.
- (active, structural_match, "1.8.0", Some(31434), None),
-
- /// Allows using the `may_dangle` attribute (RFC 1327).
- (active, dropck_eyepatch, "1.10.0", Some(34761), None),
-
- /// Allows using the `#![panic_runtime]` attribute.
- (active, panic_runtime, "1.10.0", Some(32837), None),
-
- /// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed.
- (active, needs_panic_runtime, "1.10.0", Some(32837), None),
-
- // no-tracking-issue-start
-
- /// Allows identifying the `compiler_builtins` crate.
- (active, compiler_builtins, "1.13.0", None, None),
-
- /// Allows using the `unadjusted` ABI; perma-unstable.
- (active, abi_unadjusted, "1.16.0", None, None),
-
- /// Allows identifying crates that contain sanitizer runtimes.
- (active, sanitizer_runtime, "1.17.0", None, None),
-
- /// Used to identify crates that contain the profiler runtime.
- (active, profiler_runtime, "1.18.0", None, None),
-
- /// Allows using the `thiscall` ABI.
- (active, abi_thiscall, "1.19.0", None, None),
-
- /// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`.
- (active, allocator_internals, "1.20.0", None, None),
-
- /// Added for testing E0705; perma-unstable.
- (active, test_2018_feature, "1.31.0", None, Some(Edition::Edition2018)),
-
- // no-tracking-issue-end
-
- // -------------------------------------------------------------------------
- // feature-group-end: internal feature gates
- // -------------------------------------------------------------------------
-
- // -------------------------------------------------------------------------
- // feature-group-start: actual feature gates (target features)
- // -------------------------------------------------------------------------
-
- // FIXME: Document these and merge with the list below.
-
- // Unstable `#[target_feature]` directives.
- (active, arm_target_feature, "1.27.0", Some(44839), None),
- (active, aarch64_target_feature, "1.27.0", Some(44839), None),
- (active, hexagon_target_feature, "1.27.0", Some(44839), None),
- (active, powerpc_target_feature, "1.27.0", Some(44839), None),
- (active, mips_target_feature, "1.27.0", Some(44839), None),
- (active, avx512_target_feature, "1.27.0", Some(44839), None),
- (active, mmx_target_feature, "1.27.0", Some(44839), None),
- (active, sse4a_target_feature, "1.27.0", Some(44839), None),
- (active, tbm_target_feature, "1.27.0", Some(44839), None),
- (active, wasm_target_feature, "1.30.0", Some(44839), None),
- (active, adx_target_feature, "1.32.0", Some(44839), None),
- (active, cmpxchg16b_target_feature, "1.32.0", Some(44839), None),
- (active, movbe_target_feature, "1.34.0", Some(44839), None),
- (active, rtm_target_feature, "1.35.0", Some(44839), None),
- (active, f16c_target_feature, "1.36.0", Some(44839), None),
-
- // -------------------------------------------------------------------------
- // feature-group-end: actual feature gates (target features)
- // -------------------------------------------------------------------------
-
- // -------------------------------------------------------------------------
- // feature-group-start: actual feature gates
- // -------------------------------------------------------------------------
-
- /// Allows using the `#[link_args]` attribute.
- (active, link_args, "1.0.0", Some(29596), None),
-
- /// Allows defining identifiers beyond ASCII.
- (active, non_ascii_idents, "1.0.0", Some(55467), None),
-
- /// Allows using `#[plugin_registrar]` on functions.
- (active, plugin_registrar, "1.0.0", Some(29597), None),
-
- /// Allows using `#![plugin(myplugin)]`.
- (active, plugin, "1.0.0", Some(29597), None),
-
- /// Allows using `#[thread_local]` on `static` items.
- (active, thread_local, "1.0.0", Some(29594), None),
-
- /// Allows the use of SIMD types in functions declared in `extern` blocks.
- (active, simd_ffi, "1.0.0", Some(27731), None),
-
- /// Allows using non lexical lifetimes (RFC 2094).
- (active, nll, "1.0.0", Some(43234), None),
-
- /// Allows using slice patterns.
- (active, slice_patterns, "1.0.0", Some(62254), None),
-
- /// Allows the definition of `const` functions with some advanced features.
- (active, const_fn, "1.2.0", Some(57563), None),
-
- /// Allows associated type defaults.
- (active, associated_type_defaults, "1.2.0", Some(29661), None),
-
- /// Allows `#![no_core]`.
- (active, no_core, "1.3.0", Some(29639), None),
-
- /// Allows default type parameters to influence type inference.
- (active, default_type_parameter_fallback, "1.3.0", Some(27336), None),
-
- /// Allows `repr(simd)` and importing the various simd intrinsics.
- (active, repr_simd, "1.4.0", Some(27731), None),
-
- /// Allows `extern "platform-intrinsic" { ... }`.
- (active, platform_intrinsics, "1.4.0", Some(27731), None),
-
- /// Allows `#[unwind(..)]`.
- ///
- /// Permits specifying whether a function should permit unwinding or abort on unwind.
- (active, unwind_attributes, "1.4.0", Some(58760), None),
-
- /// Allows `#[no_debug]`.
- (active, no_debug, "1.5.0", Some(29721), None),
-
- /// Allows attributes on expressions and non-item statements.
- (active, stmt_expr_attributes, "1.6.0", Some(15701), None),
-
- /// Allows the use of type ascription in expressions.
- (active, type_ascription, "1.6.0", Some(23416), None),
-
- /// Allows `cfg(target_thread_local)`.
- (active, cfg_target_thread_local, "1.7.0", Some(29594), None),
-
- /// Allows specialization of implementations (RFC 1210).
- (active, specialization, "1.7.0", Some(31844), None),
-
- /// Allows using `#[naked]` on functions.
- (active, naked_functions, "1.9.0", Some(32408), None),
-
- /// Allows `cfg(target_has_atomic = "...")`.
- (active, cfg_target_has_atomic, "1.9.0", Some(32976), 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 `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 `#[link(..., cfg(..))]`.
- (active, link_cfg, "1.14.0", Some(37406), None),
-
- /// Allows `extern "ptx-*" fn()`.
- (active, abi_ptx, "1.15.0", Some(38788), None),
-
- /// Allows the `#[repr(i128)]` attribute for enums.
- (active, repr128, "1.16.0", Some(35118), None),
-
- /// Allows `#[link(kind="static-nobundle"...)]`.
- (active, static_nobundle, "1.16.0", Some(37403), None),
-
- /// Allows `extern "msp430-interrupt" fn()`.
- (active, abi_msp430_interrupt, "1.16.0", Some(38487), None),
-
- /// Allows declarative macros 2.0 (`macro`).
- (active, decl_macro, "1.17.0", Some(39412), None),
-
- /// Allows `extern "x86-interrupt" fn()`.
- (active, abi_x86_interrupt, "1.17.0", Some(40180), None),
-
- /// Allows overlapping impls of marker traits.
- (active, overlapping_marker_traits, "1.18.0", Some(29864), None),
-
- /// Allows a test to fail without failing the whole suite.
- (active, allow_fail, "1.19.0", Some(46488), None),
-
- /// Allows unsized tuple coercion.
- (active, unsized_tuple_coercion, "1.20.0", Some(42877), None),
-
- /// Allows defining generators.
- (active, generators, "1.21.0", Some(43122), None),
-
- /// Allows `#[doc(cfg(...))]`.
- (active, doc_cfg, "1.21.0", Some(43781), None),
-
- /// Allows `#[doc(masked)]`.
- (active, doc_masked, "1.21.0", Some(44027), None),
-
- /// Allows `#[doc(spotlight)]`.
- (active, doc_spotlight, "1.22.0", Some(45040), None),
-
- /// Allows `#[doc(include = "some-file")]`.
- (active, external_doc, "1.22.0", Some(44732), None),
-
- /// Allows using `crate` as visibility modifier, synonymous with `pub(crate)`.
- (active, crate_visibility_modifier, "1.23.0", Some(53120), None),
-
- /// Allows defining `extern type`s.
- (active, extern_types, "1.23.0", Some(43467), None),
-
- /// Allows trait methods with arbitrary self types.
- (active, arbitrary_self_types, "1.23.0", Some(44874), None),
-
- /// Allows in-band quantification of lifetime bindings (e.g., `fn foo(x: &'a u8) -> &'a u8`).
- (active, in_band_lifetimes, "1.23.0", Some(44524), None),
-
- /// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598).
- (active, generic_associated_types, "1.23.0", Some(44265), None),
-
- /// Allows defining `trait X = A + B;` alias items.
- (active, trait_alias, "1.24.0", Some(41517), None),
-
- /// Allows infering `'static` outlives requirements (RFC 2093).
- (active, infer_static_outlives_requirements, "1.26.0", Some(54185), None),
-
- /// Allows accessing fields of unions inside `const` functions.
- (active, const_fn_union, "1.27.0", Some(51909), None),
-
- /// Allows casting raw pointers to `usize` during const eval.
- (active, const_raw_ptr_to_usize_cast, "1.27.0", Some(51910), None),
-
- /// Allows dereferencing raw pointers during const eval.
- (active, const_raw_ptr_deref, "1.27.0", Some(51911), None),
-
- /// Allows comparing raw pointers during const eval.
- (active, const_compare_raw_pointers, "1.27.0", Some(53020), None),
-
- /// Allows `#[doc(alias = "...")]`.
- (active, doc_alias, "1.27.0", Some(50146), None),
-
- /// Allows inconsistent bounds in where clauses.
- (active, trivial_bounds, "1.28.0", Some(48214), None),
-
- /// Allows `'a: { break 'a; }`.
- (active, label_break_value, "1.28.0", Some(48594), None),
-
- /// Allows using `#[doc(keyword = "...")]`.
- (active, doc_keyword, "1.28.0", Some(51315), None),
-
- /// Allows reinterpretation of the bits of a value of one type as another
- /// type during const eval.
- (active, const_transmute, "1.29.0", Some(53605), None),
-
- /// Allows using `try {...}` expressions.
- (active, try_blocks, "1.29.0", Some(31436), None),
-
- /// Allows defining an `#[alloc_error_handler]`.
- (active, alloc_error_handler, "1.29.0", Some(51540), None),
-
- /// Allows using the `amdgpu-kernel` ABI.
- (active, abi_amdgpu_kernel, "1.29.0", Some(51575), None),
-
- /// Allows panicking during const eval (producing compile-time errors).
- (active, const_panic, "1.30.0", Some(51999), None),
-
- /// Allows `#[marker]` on certain traits allowing overlapping implementations.
- (active, marker_trait_attr, "1.30.0", Some(29864), None),
-
- /// Allows macro invocations on modules expressions and statements and
- /// procedural macros to expand to non-items.
- (active, proc_macro_hygiene, "1.30.0", Some(54727), None),
-
- /// Allows unsized rvalues at arguments and parameters.
- (active, unsized_locals, "1.30.0", Some(48055), None),
-
- /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.
- (active, custom_test_frameworks, "1.30.0", Some(50297), None),
-
- /// Allows non-builtin attributes in inner attribute position.
- (active, custom_inner_attributes, "1.30.0", Some(54726), None),
-
- /// Allows `impl Trait` in bindings (`let`, `const`, `static`).
- (active, impl_trait_in_bindings, "1.30.0", Some(63065), None),
-
- /// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check.
- (active, lint_reasons, "1.31.0", Some(54503), None),
-
- /// Allows exhaustive integer pattern matching on `usize` and `isize`.
- (active, precise_pointer_size_matching, "1.32.0", Some(56354), None),
-
- /// Allows using `#[ffi_returns_twice]` on foreign functions.
- (active, ffi_returns_twice, "1.34.0", Some(58314), None),
-
- /// Allows const generic types (e.g. `struct Foo<const N: usize>(...);`).
- (active, const_generics, "1.34.0", Some(44580), None),
-
- /// Allows using `#[optimize(X)]`.
- (active, optimize_attribute, "1.34.0", Some(54882), None),
-
- /// Allows using C-variadics.
- (active, c_variadic, "1.34.0", Some(44930), None),
-
- /// Allows the user of associated type bounds.
- (active, associated_type_bounds, "1.34.0", Some(52662), None),
-
- /// Allows `if/while p && let q = r && ...` chains.
- (active, let_chains, "1.37.0", Some(53667), None),
-
- /// Allows #[repr(transparent)] on enums (RFC 2645).
- (active, transparent_enums, "1.37.0", Some(60405), None),
-
- /// Allows #[repr(transparent)] on unions (RFC 2645).
- (active, transparent_unions, "1.37.0", Some(60405), None),
-
- /// Allows explicit discriminants on non-unit enum variants.
- (active, arbitrary_enum_discriminant, "1.37.0", Some(60553), None),
-
- /// Allows `impl Trait` with multiple unrelated lifetimes.
- (active, member_constraints, "1.37.0", Some(61977), None),
-
- /// Allows `async || body` closures.
- (active, async_closure, "1.37.0", Some(62290), None),
-
- /// Allows `[x; N]` where `x` is a constant (RFC 2203).
- (active, const_in_array_repeat_expressions, "1.37.0", Some(49147), 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 or-patterns (e.g., `0 | 1`).
- (active, or_patterns, "1.38.0", Some(54883), None),
-
- /// Allows the definition of `const extern fn` and `const unsafe extern fn`.
- (active, const_extern_fn, "1.40.0", Some(64926), None),
-
- /// Allows the use of raw-dylibs (RFC 2627).
- (active, raw_dylib, "1.40.0", Some(58713), None),
-
- /// Allows `#[track_caller]` to be used which provides
- /// accurate caller location reporting during panic (RFC 2091).
- (active, track_caller, "1.40.0", Some(47809), 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 the `efiapi` ABI.
- (active, abi_efiapi, "1.40.0", Some(65815), None),
-
- /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.
- (active, raw_ref_op, "1.41.0", Some(64490), None),
-
- /// Allows diverging expressions to fall back to `!` rather than `()`.
- (active, never_type_fallback, "1.41.0", Some(65992), 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 use of `if` and `match` in constants.
- (active, const_if_match, "1.41.0", Some(49146), None),
-
- // -------------------------------------------------------------------------
- // feature-group-end: actual feature gates
- // -------------------------------------------------------------------------
-);
-
-/// Some features are known to be incomplete and using them is likely to have
-/// unanticipated results, such as compiler crashes. We warn the user about these
-/// to alert them.
-pub const INCOMPLETE_FEATURES: &[Symbol] = &[
- sym::impl_trait_in_bindings,
- sym::generic_associated_types,
- sym::const_generics,
- sym::or_patterns,
- sym::let_chains,
- sym::raw_dylib,
- sym::track_caller,
-];
use super::check::{emit_feature_err, GateIssue};
use super::check::{Stability, EXPLAIN_ALLOW_INTERNAL_UNSAFE, EXPLAIN_ALLOW_INTERNAL_UNSTABLE};
-use super::active::Features;
+use rustc_feature::Features;
use crate::ast;
use crate::attr::AttributeTemplate;
use crate::sess::ParseSess;
-use crate::symbol::{Symbol, sym};
+use syntax_pos::symbol::{Symbol, sym};
use syntax_pos::Span;
use rustc_data_structures::fx::FxHashMap;
use lazy_static::lazy_static;
-use super::{active::{ACTIVE_FEATURES, Features}, Feature, State as FeatureState};
-use super::accepted::ACCEPTED_FEATURES;
-use super::removed::{REMOVED_FEATURES, STABLE_REMOVED_FEATURES};
+use rustc_feature::{ACCEPTED_FEATURES, ACTIVE_FEATURES, Features, Feature, State as FeatureState};
+use rustc_feature::{REMOVED_FEATURES, STABLE_REMOVED_FEATURES};
use super::builtin_attrs::{AttributeGate, BUILTIN_ATTRIBUTE_MAP};
use crate::ast::{self, AssocTyConstraint, AssocTyConstraintKind, NodeId};
+++ /dev/null
-//! # Feature gating
-//!
-//! This module implements the gating necessary for preventing certain compiler
-//! features from being used by default. This module will crawl a pre-expanded
-//! AST to ensure that there are no features which are used that are not
-//! enabled.
-//!
-//! Features are enabled in programs via the crate-level attributes of
-//! `#![feature(...)]` with a comma-separated list of features.
-//!
-//! For the purpose of future feature-tracking, once code for detection of feature
-//! gate usage is added, *do not remove it again* even once the feature
-//! becomes stable.
-
-mod accepted;
-mod removed;
-mod active;
-mod builtin_attrs;
-mod check;
-
-use crate::{edition::Edition, symbol::Symbol};
-use std::fmt;
-use std::num::NonZeroU32;
-use syntax_pos::Span;
-
-#[derive(Clone, Copy)]
-pub enum State {
- Accepted,
- Active { set: fn(&mut Features, Span) },
- Removed { reason: Option<&'static str> },
- Stabilized { reason: Option<&'static str> },
-}
-
-impl fmt::Debug for State {
- fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
- match self {
- State::Accepted { .. } => write!(f, "accepted"),
- State::Active { .. } => write!(f, "active"),
- State::Removed { .. } => write!(f, "removed"),
- State::Stabilized { .. } => write!(f, "stabilized"),
- }
- }
-}
-
-#[derive(Debug, Clone)]
-pub struct Feature {
- state: State,
- name: Symbol,
- since: &'static str,
- issue: Option<u32>, // FIXME: once #58732 is done make this an Option<NonZeroU32>
- edition: Option<Edition>,
- description: &'static str,
-}
-
-impl Feature {
- fn issue(&self) -> Option<NonZeroU32> {
- self.issue.and_then(|i| NonZeroU32::new(i))
- }
-}
-
-pub use active::{Features, INCOMPLETE_FEATURES};
-pub use builtin_attrs::{
- AttributeGate, AttributeType, GatedCfg,
- BuiltinAttribute, BUILTIN_ATTRIBUTES, BUILTIN_ATTRIBUTE_MAP,
- deprecated_attributes, is_builtin_attr, is_builtin_attr_name,
-};
-pub use check::{
- check_crate, check_attribute, get_features, feature_err, emit_feature_err,
- Stability, GateIssue, UnstableFeatures,
- EXPLAIN_STMT_ATTR_SYNTAX, EXPLAIN_UNSIZED_TUPLE_COERCION,
-};
+++ /dev/null
-//! List of the removed feature gates.
-
-use crate::symbol::sym;
-use super::{State, Feature};
-
-macro_rules! declare_features {
- ($(
- $(#[doc = $doc:tt])* (removed, $feature:ident, $ver:expr, $issue:expr, None, $reason:expr),
- )+) => {
- /// Represents unstable features which have since been removed (it was once Active)
- pub const REMOVED_FEATURES: &[Feature] = &[
- $(
- Feature {
- state: State::Removed { reason: $reason },
- name: sym::$feature,
- since: $ver,
- issue: $issue,
- edition: None,
- description: concat!($($doc,)*),
- }
- ),+
- ];
- };
-
- ($(
- $(#[doc = $doc:tt])* (stable_removed, $feature:ident, $ver:expr, $issue:expr, None),
- )+) => {
- /// Represents stable features which have since been removed (it was once Accepted)
- pub const STABLE_REMOVED_FEATURES: &[Feature] = &[
- $(
- Feature {
- state: State::Stabilized { reason: None },
- name: sym::$feature,
- since: $ver,
- issue: $issue,
- edition: None,
- description: concat!($($doc,)*),
- }
- ),+
- ];
- };
-}
-
-declare_features! (
- // -------------------------------------------------------------------------
- // feature-group-start: removed features
- // -------------------------------------------------------------------------
-
- (removed, import_shadowing, "1.0.0", None, None, None),
- (removed, managed_boxes, "1.0.0", None, None, None),
- /// Allows use of unary negate on unsigned integers, e.g., -e for e: u8
- (removed, negate_unsigned, "1.0.0", Some(29645), None, None),
- (removed, reflect, "1.0.0", Some(27749), None, None),
- /// A way to temporarily opt out of opt in copy. This will *never* be accepted.
- (removed, opt_out_copy, "1.0.0", None, None, None),
- (removed, quad_precision_float, "1.0.0", None, None, None),
- (removed, struct_inherit, "1.0.0", None, None, None),
- (removed, test_removed_feature, "1.0.0", None, None, None),
- (removed, visible_private_types, "1.0.0", None, None, None),
- (removed, unsafe_no_drop_flag, "1.0.0", None, None, None),
- /// Allows using items which are missing stability attributes
- (removed, unmarked_api, "1.0.0", None, None, None),
- (removed, allocator, "1.0.0", None, None, None),
- (removed, simd, "1.0.0", Some(27731), None,
- Some("removed in favor of `#[repr(simd)]`")),
- (removed, advanced_slice_patterns, "1.0.0", Some(62254), None,
- Some("merged into `#![feature(slice_patterns)]`")),
- (removed, macro_reexport, "1.0.0", Some(29638), None,
- Some("subsumed by `pub use`")),
- /// Allows using custom attributes (RFC 572).
- (removed, custom_attribute, "1.0.0", Some(29642), None,
- Some("removed in favor of `#![register_tool]` and `#![register_attr]`")),
- (removed, pushpop_unsafe, "1.2.0", None, None, None),
- (removed, needs_allocator, "1.4.0", Some(27389), None,
- Some("subsumed by `#![feature(allocator_internals)]`")),
- (removed, proc_macro_mod, "1.27.0", Some(54727), None,
- Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
- (removed, proc_macro_expr, "1.27.0", Some(54727), None,
- Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
- (removed, proc_macro_non_items, "1.27.0", Some(54727), None,
- Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
- (removed, proc_macro_gen, "1.27.0", Some(54727), None,
- Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
- (removed, panic_implementation, "1.28.0", Some(44489), None,
- Some("subsumed by `#[panic_handler]`")),
- /// Allows the use of `#[derive(Anything)]` as sugar for `#[derive_Anything]`.
- (removed, custom_derive, "1.32.0", Some(29644), None,
- Some("subsumed by `#[proc_macro_derive]`")),
- /// Paths of the form: `extern::foo::bar`
- (removed, extern_in_paths, "1.33.0", Some(55600), None,
- Some("subsumed by `::foo::bar` paths")),
- (removed, quote, "1.33.0", Some(29601), None, None),
- /// Allows using `#[unsafe_destructor_blind_to_params]` (RFC 1238).
- (removed, dropck_parametricity, "1.38.0", Some(28498), None, None),
- (removed, await_macro, "1.38.0", Some(50547), None,
- Some("subsumed by `.await` syntax")),
- /// Allows defining `existential type`s.
- (removed, existential_type, "1.38.0", Some(63063), None,
- Some("removed in favor of `#![feature(type_alias_impl_trait)]`")),
- /// Allows using the macros:
- /// + `__diagnostic_used`
- /// + `__register_diagnostic`
- /// +`__build_diagnostic_array`
- (removed, rustc_diagnostic_macros, "1.38.0", None, None, None),
- /// Allows using `#[on_unimplemented(..)]` on traits.
- /// (Moved to `rustc_attrs`.)
- (removed, on_unimplemented, "1.40.0", None, None, None),
-
- // -------------------------------------------------------------------------
- // feature-group-end: removed features
- // -------------------------------------------------------------------------
-);
-
-declare_features! (
- (stable_removed, no_stack_check, "1.0.0", None, None),
-);
pub mod expand;
pub use syntax_pos::source_map;
pub mod entry;
-pub mod feature_gate;
+pub mod feature_gate {
+ mod check;
+ pub use check::{
+ check_crate, check_attribute, get_features, feature_err, emit_feature_err,
+ Stability, GateIssue, UnstableFeatures,
+ EXPLAIN_STMT_ATTR_SYNTAX, EXPLAIN_UNSIZED_TUPLE_COERCION,
+ };
+ mod builtin_attrs;
+ pub use builtin_attrs::{
+ AttributeGate, AttributeType, GatedCfg,
+ BuiltinAttribute, BUILTIN_ATTRIBUTES, BUILTIN_ATTRIBUTE_MAP,
+ deprecated_attributes, is_builtin_attr, is_builtin_attr_name,
+ };
+}
pub mod mut_visit;
pub mod ptr;
pub mod show_span;
syntax_pos = { path = "../libsyntax_pos" }
errors = { path = "../librustc_errors", package = "rustc_errors" }
rustc_data_structures = { path = "../librustc_data_structures" }
+rustc_feature = { path = "../librustc_feature" }
rustc_lexer = { path = "../librustc_lexer" }
rustc_parse = { path = "../librustc_parse" }
smallvec = { version = "1.0", features = ["union", "may_dangle"] }
use crate::mbe::macro_rules::annotate_err_with_kind;
use crate::placeholders::{placeholder, PlaceholderExpander};
use crate::config::StripUnconfigured;
-use rustc_parse::configure;
+use rustc_feature::Features;
+use rustc_parse::configure;
use rustc_parse::DirectoryOwnership;
use rustc_parse::parser::Parser;
use rustc_parse::validate_attr;
use syntax::ast::{MacStmtStyle, StmtKind, ItemKind};
use syntax::attr::{self, HasAttrs};
use syntax::source_map::respan;
-use syntax::feature_gate::{self, Features, GateIssue, is_builtin_attr, emit_feature_err};
+use syntax::feature_gate::{self, GateIssue, is_builtin_attr, emit_feature_err};
use syntax::mut_visit::*;
use syntax::print::pprust;
use syntax::ptr::P;
use crate::mbe::macro_parser::{MatchedNonterminal, MatchedSeq, NamedParseResult};
use crate::mbe::transcribe::transcribe;
+use rustc_feature::Features;
use rustc_parse::parser::Parser;
use rustc_parse::Directory;
use syntax::ast;
use syntax::attr::{self, TransparencyError};
use syntax::edition::Edition;
-use syntax::feature_gate::Features;
use syntax::print::pprust;
use syntax::sess::ParseSess;
use syntax::symbol::{kw, sym, Symbol};
fmt_macros = { path = "../libfmt_macros" }
log = "0.4"
rustc_data_structures = { path = "../librustc_data_structures" }
+rustc_feature = { path = "../librustc_feature" }
rustc_parse = { path = "../librustc_parse" }
rustc_target = { path = "../librustc_target" }
smallvec = { version = "1.0", features = ["union", "may_dangle"] }
use log::debug;
use smallvec::{smallvec, SmallVec};
+use rustc_feature::Features;
use rustc_target::spec::PanicStrategy;
use syntax::ast::{self, Ident};
use syntax::attr;
use syntax::entry::{self, EntryPointType};
use syntax_expand::base::{ExtCtxt, Resolver};
use syntax_expand::expand::{AstFragment, ExpansionConfig};
-use syntax::feature_gate::Features;
use syntax::mut_visit::{*, ExpectOne};
use syntax::ptr::P;
use syntax::sess::ParseSess;
projects / rust.git / commitdiff