| //! List of the active feature gates. |
| |
| use super::{to_nonzero, Feature, State}; |
| |
| use rustc_data_structures::fx::FxHashSet; |
| use rustc_span::edition::Edition; |
| use rustc_span::symbol::{sym, Symbol}; |
| use rustc_span::Span; |
| |
| macro_rules! set { |
| ($field: ident) => {{ |
| fn f(features: &mut Features, _: Span) { |
| features.$field = true; |
| } |
| f as fn(&mut Features, Span) |
| }}; |
| } |
| |
| macro_rules! declare_features { |
| (__status_to_bool active) => { |
| false |
| }; |
| (__status_to_bool incomplete) => { |
| true |
| }; |
| ($( |
| $(#[doc = $doc:tt])* ($status:ident, $feature:ident, $ver:expr, $issue:expr, $edition:expr), |
| )+) => { |
| /// Represents active features that are currently being implemented or |
| /// currently being considered for addition/removal. |
| pub const ACTIVE_FEATURES: |
| &[Feature] = |
| &[$( |
| // (sym::$feature, $ver, $issue, $edition, set!($feature)) |
| Feature { |
| state: State::Active { set: set!($feature) }, |
| name: sym::$feature, |
| since: $ver, |
| issue: to_nonzero($issue), |
| edition: $edition, |
| } |
| ),+]; |
| |
| /// A set of features to be used by later passes. |
| #[derive(Clone, Default, Debug)] |
| 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)>, |
| /// Features enabled for this crate. |
| pub active_features: FxHashSet<Symbol>, |
| $( |
| $(#[doc = $doc])* |
| pub $feature: bool |
| ),+ |
| } |
| |
| impl Features { |
| pub fn walk_feature_fields(&self, mut f: impl FnMut(&str, bool)) { |
| $(f(stringify!($feature), self.$feature);)+ |
| } |
| |
| /// Is the given feature active? |
| pub fn active(&self, feature: Symbol) -> bool { |
| self.active_features.contains(&feature) |
| } |
| |
| /// Is the given feature enabled? |
| /// |
| /// Panics if the symbol doesn't correspond to a declared feature. |
| pub fn enabled(&self, feature: Symbol) -> bool { |
| match feature { |
| $( sym::$feature => self.$feature, )* |
| |
| _ => panic!("`{}` was not listed in `declare_features`", feature), |
| } |
| } |
| |
| /// 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 fn incomplete(&self, feature: Symbol) -> bool { |
| match feature { |
| $( |
| sym::$feature => declare_features!(__status_to_bool $status), |
| )* |
| // accepted and removed features aren't in this file but are never incomplete |
| _ if self.declared_lang_features.iter().any(|f| f.0 == feature) => false, |
| _ if self.declared_lib_features.iter().any(|f| f.0 == feature) => false, |
| _ => panic!("`{}` was not listed in `declare_features`", 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), |
| } |
| } |
| } |
| |
| // See https://rustc-dev-guide.rust-lang.org/feature-gates.html#feature-gates for more |
| // documentation about handling feature gates. |
| // |
| // If you change this, please modify `src/doc/unstable-book` as well. |
| // |
| // Don't ever remove anything from this list; move them to `accepted.rs` if |
| // accepted or `removed.rs` if removed. |
| // |
| // The version numbers here correspond to the version in which the current status |
| // was set. This is most important for knowing when a particular feature became |
| // stable (active). |
| // |
| // 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. |
| |
| #[rustfmt::skip] |
| declare_features! ( |
| // ------------------------------------------------------------------------- |
| // feature-group-start: internal feature gates (no tracking issue) |
| // ------------------------------------------------------------------------- |
| // no-tracking-issue-start |
| |
| /// Allows using the `thiscall` ABI. |
| (active, abi_thiscall, "1.19.0", None, None), |
| /// Allows using the `unadjusted` ABI; perma-unstable. |
| (active, abi_unadjusted, "1.16.0", None, None), |
| /// Allows using the `vectorcall` ABI. |
| (active, abi_vectorcall, "1.7.0", None, None), |
| /// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`. |
| (active, allocator_internals, "1.20.0", 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 `#[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 anonymous lifetimes in argument-position impl-trait. |
| (active, anonymous_lifetime_in_impl_trait, "1.63.0", None, None), |
| /// Allows identifying the `compiler_builtins` crate. |
| (active, compiler_builtins, "1.13.0", None, None), |
| /// Outputs useful `assert!` messages |
| (active, generic_assert, "1.63.0", None, 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 `#[omit_gdb_pretty_printer_section]`. |
| (active, omit_gdb_pretty_printer_section, "1.5.0", None, None), |
| /// Allows using `#[prelude_import]` on glob `use` items. |
| (active, prelude_import, "1.2.0", None, None), |
| /// Used to identify crates that contain the profiler runtime. |
| (active, profiler_runtime, "1.18.0", None, None), |
| /// Allows using `rustc_*` attributes (RFC 572). |
| (active, rustc_attrs, "1.0.0", None, None), |
| /// Allows using the `#[stable]` and `#[unstable]` attributes. |
| (active, staged_api, "1.0.0", None, None), |
| /// Added for testing E0705; perma-unstable. |
| (active, test_2018_feature, "1.31.0", None, Some(Edition::Edition2018)), |
| /// Added for testing unstable lints; perma-unstable. |
| (active, test_unstable_lint, "1.60.0", None, None), |
| /// Allows non-`unsafe` —and thus, unsound— access to `Pin` constructions. |
| /// Marked `incomplete` since perma-unstable and unsound. |
| (incomplete, unsafe_pin_internals, "1.60.0", None, None), |
| /// Use for stable + negative coherence and strict coherence depending on trait's |
| /// rustc_strict_coherence value. |
| (active, with_negative_coherence, "1.60.0", None, None), |
| // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
| // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way. |
| // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
| |
| // no-tracking-issue-end |
| // ------------------------------------------------------------------------- |
| // feature-group-end: internal feature gates (no tracking issue) |
| // ------------------------------------------------------------------------- |
| |
| // ------------------------------------------------------------------------- |
| // feature-group-start: internal feature gates |
| // ------------------------------------------------------------------------- |
| |
| /// Allows features specific to auto traits. |
| /// Renamed from `optin_builtin_traits`. |
| (active, auto_traits, "1.50.0", Some(13231), None), |
| /// Allows using `box` in patterns (RFC 469). |
| (active, box_patterns, "1.0.0", Some(29641), None), |
| /// Allows using the `box $expr` syntax. |
| (active, box_syntax, "1.0.0", Some(49733), None), |
| /// Allows `#[doc(notable_trait)]`. |
| /// Renamed from `doc_spotlight`. |
| (active, doc_notable_trait, "1.52.0", Some(45040), None), |
| /// Allows using the `may_dangle` attribute (RFC 1327). |
| (active, dropck_eyepatch, "1.10.0", Some(34761), None), |
| /// Allows using the `#[fundamental]` attribute. |
| (active, fundamental, "1.0.0", Some(29635), None), |
| /// Allows using `#[link_name="llvm.*"]`. |
| (active, link_llvm_intrinsics, "1.0.0", Some(29602), None), |
| /// Allows using the `#[linkage = ".."]` attribute. |
| (active, linkage, "1.0.0", Some(29603), None), |
| /// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed. |
| (active, needs_panic_runtime, "1.10.0", Some(32837), None), |
| /// Allows using the `#![panic_runtime]` attribute. |
| (active, panic_runtime, "1.10.0", Some(32837), None), |
| /// Allows using `#[rustc_allow_const_fn_unstable]`. |
| /// This is an attribute on `const fn` for the same |
| /// purpose as `#[allow_internal_unstable]`. |
| (active, rustc_allow_const_fn_unstable, "1.49.0", Some(69399), None), |
| /// Allows using compiler's own crates. |
| (active, rustc_private, "1.0.0", Some(27812), None), |
| /// Allows using internal rustdoc features like `doc(primitive)` or `doc(keyword)`. |
| (active, rustdoc_internals, "1.58.0", Some(90418), None), |
| /// Allows using the `rustdoc::missing_doc_code_examples` lint |
| (active, rustdoc_missing_doc_code_examples, "1.31.0", Some(101730), None), |
| /// Allows using `#[start]` on a function indicating that it is the program entrypoint. |
| (active, start, "1.0.0", Some(29633), None), |
| /// Allows using `#[structural_match]` which indicates that a type is structurally matchable. |
| /// FIXME: Subsumed by trait `StructuralPartialEq`, cannot move to removed until a library |
| /// feature with the same name exists. |
| (active, structural_match, "1.8.0", Some(31434), None), |
| /// Allows using the `rust-call` ABI. |
| (active, unboxed_closures, "1.0.0", Some(29625), None), |
| // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
| // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way. |
| // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
| |
| // ------------------------------------------------------------------------- |
| // 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, aarch64_ver_target_feature, "1.27.0", Some(44839), None), |
| (active, arm_target_feature, "1.27.0", Some(44839), None), |
| (active, avx512_target_feature, "1.27.0", Some(44839), None), |
| (active, bpf_target_feature, "1.54.0", Some(44839), None), |
| (active, cmpxchg16b_target_feature, "1.32.0", Some(44839), None), |
| (active, ermsb_target_feature, "1.49.0", Some(44839), None), |
| (active, f16c_target_feature, "1.36.0", Some(44839), None), |
| (active, hexagon_target_feature, "1.27.0", Some(44839), None), |
| (active, mips_target_feature, "1.27.0", Some(44839), None), |
| (active, movbe_target_feature, "1.34.0", Some(44839), None), |
| (active, powerpc_target_feature, "1.27.0", Some(44839), None), |
| (active, riscv_target_feature, "1.45.0", Some(44839), None), |
| (active, rtm_target_feature, "1.35.0", Some(44839), None), |
| (active, sse4a_target_feature, "1.27.0", Some(44839), None), |
| (active, tbm_target_feature, "1.27.0", Some(44839), None), |
| (active, wasm_target_feature, "1.30.0", Some(44839), None), |
| // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
| // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way. |
| // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
| |
| // ------------------------------------------------------------------------- |
| // feature-group-end: actual feature gates (target features) |
| // ------------------------------------------------------------------------- |
| |
| // ------------------------------------------------------------------------- |
| // feature-group-start: actual feature gates |
| // ------------------------------------------------------------------------- |
| |
| /// Allows using the `amdgpu-kernel` ABI. |
| (active, abi_amdgpu_kernel, "1.29.0", Some(51575), None), |
| /// Allows `extern "avr-interrupt" fn()` and `extern "avr-non-blocking-interrupt" fn()`. |
| (active, abi_avr_interrupt, "1.45.0", Some(69664), None), |
| /// Allows `extern "C-cmse-nonsecure-call" fn()`. |
| (active, abi_c_cmse_nonsecure_call, "1.51.0", Some(81391), None), |
| /// Allows using the `efiapi` ABI. |
| (active, abi_efiapi, "1.40.0", Some(65815), None), |
| /// Allows `extern "msp430-interrupt" fn()`. |
| (active, abi_msp430_interrupt, "1.16.0", Some(38487), None), |
| /// Allows `extern "ptx-*" fn()`. |
| (active, abi_ptx, "1.15.0", Some(38788), None), |
| /// Allows `extern "x86-interrupt" fn()`. |
| (active, abi_x86_interrupt, "1.17.0", Some(40180), None), |
| /// Allows additional const parameter types, such as `&'static str` or user defined types |
| (incomplete, adt_const_params, "1.56.0", Some(95174), None), |
| /// Allows defining an `#[alloc_error_handler]`. |
| (active, alloc_error_handler, "1.29.0", Some(51540), None), |
| /// Allows trait methods with arbitrary self types. |
| (active, arbitrary_self_types, "1.23.0", Some(44874), None), |
| /// Allows using `const` operands in inline assembly. |
| (active, asm_const, "1.58.0", Some(93332), None), |
| /// Enables experimental inline assembly support for additional architectures. |
| (active, asm_experimental_arch, "1.58.0", Some(93335), None), |
| /// Allows the `may_unwind` option in inline assembly. |
| (active, asm_unwind, "1.58.0", Some(93334), None), |
| /// Allows users to enforce equality of associated constants `TraitImpl<AssocConst=3>`. |
| (active, associated_const_equality, "1.58.0", Some(92827), None), |
| /// Allows the user of associated type bounds. |
| (active, associated_type_bounds, "1.34.0", Some(52662), None), |
| /// Allows associated type defaults. |
| (active, associated_type_defaults, "1.2.0", Some(29661), None), |
| /// Allows `async || body` closures. |
| (active, async_closure, "1.37.0", Some(62290), None), |
| /// Alows async functions to be declared, implemented, and used in traits. |
| (incomplete, async_fn_in_trait, "1.66.0", Some(91611), None), |
| /// Allows `extern "C-unwind" fn` to enable unwinding across ABI boundaries. |
| (active, c_unwind, "1.52.0", Some(74990), None), |
| /// Allows using C-variadics. |
| (active, c_variadic, "1.34.0", Some(44930), None), |
| /// Allows capturing disjoint fields in a closure/generator (RFC 2229). |
| (incomplete, capture_disjoint_fields, "1.49.0", Some(53488), None), |
| /// Allows the use of `#[cfg(sanitize = "option")]`; set when -Zsanitizer is used. |
| (active, cfg_sanitize, "1.41.0", Some(39699), None), |
| /// Allows `cfg(target_abi = "...")`. |
| (active, cfg_target_abi, "1.55.0", Some(80970), None), |
| /// Allows `cfg(target(abi = "..."))`. |
| (active, cfg_target_compact, "1.63.0", Some(96901), None), |
| /// Allows `cfg(target_has_atomic_load_store = "...")`. |
| (active, cfg_target_has_atomic, "1.60.0", Some(94039), None), |
| /// Allows `cfg(target_has_atomic_equal_alignment = "...")`. |
| (active, cfg_target_has_atomic_equal_alignment, "1.60.0", Some(93822), None), |
| /// Allows `cfg(target_thread_local)`. |
| (active, cfg_target_thread_local, "1.7.0", Some(29594), None), |
| /// Allow conditional compilation depending on rust version |
| (active, cfg_version, "1.45.0", Some(64796), None), |
| /// Allows `for<...>` on closures and generators. |
| (active, closure_lifetime_binder, "1.64.0", Some(97362), None), |
| /// Allows `#[track_caller]` on closures and generators. |
| (active, closure_track_caller, "1.57.0", Some(87417), None), |
| /// Allows to use the `#[cmse_nonsecure_entry]` attribute. |
| (active, cmse_nonsecure_entry, "1.48.0", Some(75835), None), |
| /// Allows use of the `#[collapse_debuginfo]` attribute. |
| (active, collapse_debuginfo, "1.65.0", Some(100758), None), |
| /// Allows `async {}` expressions in const contexts. |
| (active, const_async_blocks, "1.53.0", Some(85368), None), |
| // Allows limiting the evaluation steps of const expressions |
| (active, const_eval_limit, "1.43.0", Some(67217), None), |
| /// Allows the definition of `const extern fn` and `const unsafe extern fn`. |
| (active, const_extern_fn, "1.40.0", Some(64926), None), |
| /// Allows basic arithmetic on floating point types in a `const fn`. |
| (active, const_fn_floating_point_arithmetic, "1.48.0", Some(57241), None), |
| /// Allows `for _ in _` loops in const contexts. |
| (active, const_for, "1.56.0", Some(87575), None), |
| /// Allows using `&mut` in constant functions. |
| (active, const_mut_refs, "1.41.0", Some(57349), None), |
| /// Be more precise when looking for live drops in a const context. |
| (active, const_precise_live_drops, "1.46.0", Some(73255), None), |
| /// Allows references to types with interior mutability within constants |
| (active, const_refs_to_cell, "1.51.0", Some(80384), None), |
| /// Allows `impl const Trait for T` syntax. |
| (active, const_trait_impl, "1.42.0", Some(67792), None), |
| /// Allows the `?` operator in const contexts. |
| (active, const_try, "1.56.0", Some(74935), None), |
| /// Allows non-builtin attributes in inner attribute position. |
| (active, custom_inner_attributes, "1.30.0", Some(54726), None), |
| /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`. |
| (active, custom_test_frameworks, "1.30.0", Some(50297), None), |
| /// Allows using `#[debugger_visualizer]`. |
| (active, debugger_visualizer, "1.62.0", Some(95939), None), |
| /// Allows declarative macros 2.0 (`macro`). |
| (active, decl_macro, "1.17.0", Some(39412), None), |
| /// Allows rustc to inject a default alloc_error_handler |
| (active, default_alloc_error_handler, "1.48.0", Some(66741), None), |
| /// Allows default type parameters to influence type inference. |
| (active, default_type_parameter_fallback, "1.3.0", Some(27336), None), |
| /// Allows using `#[deprecated_safe]` to deprecate the safeness of a function or trait |
| (active, deprecated_safe, "1.61.0", Some(94978), None), |
| /// Allows having using `suggestion` in the `#[deprecated]` attribute. |
| (active, deprecated_suggestion, "1.61.0", Some(94785), None), |
| /// Tells rustdoc to automatically generate `#[doc(cfg(...))]`. |
| (active, doc_auto_cfg, "1.58.0", Some(43781), None), |
| /// Allows `#[doc(cfg(...))]`. |
| (active, doc_cfg, "1.21.0", Some(43781), None), |
| /// Allows `#[doc(cfg_hide(...))]`. |
| (active, doc_cfg_hide, "1.57.0", Some(43781), None), |
| /// Allows `#[doc(masked)]`. |
| (active, doc_masked, "1.21.0", Some(44027), None), |
| /// Allows `dyn* Trait` objects. |
| (incomplete, dyn_star, "1.65.0", Some(91611), 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 defining `extern type`s. |
| (active, extern_types, "1.23.0", Some(43467), None), |
| /// Allows the use of `#[ffi_const]` on foreign functions. |
| (active, ffi_const, "1.45.0", Some(58328), None), |
| /// Allows the use of `#[ffi_pure]` on foreign functions. |
| (active, ffi_pure, "1.45.0", Some(58329), None), |
| /// Allows using `#[ffi_returns_twice]` on foreign functions. |
| (active, ffi_returns_twice, "1.34.0", Some(58314), None), |
| /// Allows using `#[repr(align(...))]` on function items |
| (active, fn_align, "1.53.0", Some(82232), None), |
| /// Allows generators to be cloned. |
| (active, generator_clone, "1.65.0", Some(95360), None), |
| /// Allows defining generators. |
| (active, generators, "1.21.0", Some(43122), None), |
| /// Infer generic args for both consts and types. |
| (active, generic_arg_infer, "1.55.0", Some(85077), None), |
| /// An extension to the `generic_associated_types` feature, allowing incomplete features. |
| (incomplete, generic_associated_types_extended, "1.61.0", Some(95451), None), |
| /// Allows non-trivial generic constants which have to have wfness manually propagated to callers |
| (incomplete, generic_const_exprs, "1.56.0", Some(76560), None), |
| /// Allows using `..=X` as a patterns in slices. |
| (active, half_open_range_patterns_in_slices, "1.66.0", Some(67264), None), |
| /// Allows `if let` guard in match arms. |
| (active, if_let_guard, "1.47.0", Some(51114), None), |
| /// Allows using imported `main` function |
| (active, imported_main, "1.53.0", Some(28937), None), |
| /// Allows associated types in inherent impls. |
| (incomplete, inherent_associated_types, "1.52.0", Some(8995), None), |
| /// Allow anonymous constants from an inline `const` block |
| (active, inline_const, "1.49.0", Some(76001), None), |
| /// Allow anonymous constants from an inline `const` block in pattern position |
| (incomplete, inline_const_pat, "1.58.0", Some(76001), None), |
| /// Allows using `pointer` and `reference` in intra-doc links |
| (active, intra_doc_pointers, "1.51.0", Some(80896), None), |
| /// Allows `#[instruction_set(_)]` attribute |
| (active, isa_attribute, "1.48.0", Some(74727), None), |
| // Allows setting the threshold for the `large_assignments` lint. |
| (active, large_assignments, "1.52.0", Some(83518), None), |
| /// Allows `if/while p && let q = r && ...` chains. |
| (active, let_chains, "1.37.0", Some(53667), None), |
| /// Allows `#[link(..., cfg(..))]`. |
| (active, link_cfg, "1.14.0", Some(37406), None), |
| /// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check. |
| (active, lint_reasons, "1.31.0", Some(54503), None), |
| /// Give access to additional metadata about declarative macro meta-variables. |
| (active, macro_metavar_expr, "1.61.0", Some(83527), None), |
| /// Allows `#[marker]` on certain traits allowing overlapping implementations. |
| (active, marker_trait_attr, "1.30.0", Some(29864), None), |
| /// A minimal, sound subset of specialization intended to be used by the |
| /// standard library until the soundness issues with specialization |
| /// are fixed. |
| (active, min_specialization, "1.7.0", Some(31844), None), |
| /// Allows qualified paths in struct expressions, struct patterns and tuple struct patterns. |
| (active, more_qualified_paths, "1.54.0", Some(86935), None), |
| /// Allows the `#[must_not_suspend]` attribute. |
| (active, must_not_suspend, "1.57.0", Some(83310), None), |
| /// Allows using `#[naked]` on functions. |
| (active, naked_functions, "1.9.0", Some(32408), None), |
| /// Allows specifying the as-needed link modifier |
| (active, native_link_modifiers_as_needed, "1.53.0", Some(81490), None), |
| /// Allows specifying the verbatim link modifier |
| (active, native_link_modifiers_verbatim, "1.53.0", Some(81490), None), |
| /// Allow negative trait implementations. |
| (active, negative_impls, "1.44.0", Some(68318), None), |
| /// Allows the `!` type. Does not imply 'exhaustive_patterns' (below) any more. |
| (active, never_type, "1.13.0", Some(35121), None), |
| /// Allows diverging expressions to fall back to `!` rather than `()`. |
| (active, never_type_fallback, "1.41.0", Some(65992), None), |
| /// Allows `#![no_core]`. |
| (active, no_core, "1.3.0", Some(29639), None), |
| /// Allows function attribute `#[no_coverage]`, to bypass coverage |
| /// instrumentation of that function. |
| (active, no_coverage, "1.53.0", Some(84605), None), |
| /// Allows the use of `no_sanitize` attribute. |
| (active, no_sanitize, "1.42.0", Some(39699), None), |
| /// Allows using the `non_exhaustive_omitted_patterns` lint. |
| (active, non_exhaustive_omitted_patterns_lint, "1.57.0", Some(89554), None), |
| /// Allows making `dyn Trait` well-formed even if `Trait` is not object safe. |
| /// In that case, `dyn Trait: Trait` does not hold. Moreover, coercions and |
| /// casts in safe Rust to `dyn Trait` for such a `Trait` is also forbidden. |
| (active, object_safe_for_dispatch, "1.40.0", Some(43561), None), |
| /// Allows using `#[optimize(X)]`. |
| (active, optimize_attribute, "1.34.0", Some(54882), None), |
| /// Allows `extern "platform-intrinsic" { ... }`. |
| (active, platform_intrinsics, "1.4.0", Some(27731), None), |
| /// Allows using `#![plugin(myplugin)]`. |
| (active, plugin, "1.0.0", Some(29597), None), |
| /// Allows exhaustive integer pattern matching on `usize` and `isize`. |
| (active, precise_pointer_size_matching, "1.32.0", Some(56354), None), |
| /// Allows macro attributes on expressions, statements and non-inline modules. |
| (active, proc_macro_hygiene, "1.30.0", Some(54727), None), |
| /// Allows the use of raw-dylibs (RFC 2627). |
| (active, raw_dylib, "1.65.0", Some(58713), None), |
| /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions. |
| (active, raw_ref_op, "1.41.0", Some(64490), None), |
| /// Allows using the `#[register_tool]` attribute. |
| (active, register_tool, "1.41.0", Some(66079), None), |
| /// Allows the `#[repr(i128)]` attribute for enums. |
| (incomplete, repr128, "1.16.0", Some(56071), None), |
| /// Allows `repr(simd)` and importing the various simd intrinsics. |
| (active, repr_simd, "1.4.0", Some(27731), None), |
| /// Allows return-position `impl Trait` in traits. |
| (incomplete, return_position_impl_trait_in_trait, "1.65.0", Some(91611), None), |
| /// Allows `extern "rust-cold"`. |
| (active, rust_cold_cc, "1.63.0", Some(97544), None), |
| /// Allows the use of SIMD types in functions declared in `extern` blocks. |
| (active, simd_ffi, "1.0.0", Some(27731), None), |
| /// Allows specialization of implementations (RFC 1210). |
| (incomplete, specialization, "1.7.0", Some(31844), None), |
| /// Allows attributes on expressions and non-item statements. |
| (active, stmt_expr_attributes, "1.6.0", Some(15701), None), |
| /// Allows lints part of the strict provenance effort. |
| (active, strict_provenance, "1.61.0", Some(95228), None), |
| /// Allows the use of `#[target_feature]` on safe functions. |
| (active, target_feature_11, "1.45.0", Some(69098), None), |
| /// Allows using `#[thread_local]` on `static` items. |
| (active, thread_local, "1.0.0", Some(29594), None), |
| /// Allows defining `trait X = A + B;` alias items. |
| (active, trait_alias, "1.24.0", Some(41517), None), |
| /// Allows upcasting trait objects via supertraits. |
| /// Trait upcasting is casting, e.g., `dyn Foo -> dyn Bar` where `Foo: Bar`. |
| (incomplete, trait_upcasting, "1.56.0", Some(65991), None), |
| /// Allows #[repr(transparent)] on unions (RFC 2645). |
| (active, transparent_unions, "1.37.0", Some(60405), None), |
| /// Allows inconsistent bounds in where clauses. |
| (active, trivial_bounds, "1.28.0", Some(48214), None), |
| /// Allows using `try {...}` expressions. |
| (active, try_blocks, "1.29.0", Some(31436), None), |
| /// Allows `impl Trait` to be used inside type aliases (RFC 2515). |
| (active, type_alias_impl_trait, "1.38.0", Some(63063), None), |
| /// Allows the use of type ascription in expressions. |
| (active, type_ascription, "1.6.0", Some(23416), None), |
| /// Allows creation of instances of a struct by moving fields that have |
| /// not changed from prior instances of the same struct (RFC #2528) |
| (active, type_changing_struct_update, "1.58.0", Some(86555), None), |
| /// Enables rustc to generate code that instructs libstd to NOT ignore SIGPIPE. |
| (active, unix_sigpipe, "1.65.0", Some(97889), None), |
| /// Allows unsized fn parameters. |
| (active, unsized_fn_params, "1.49.0", Some(48055), None), |
| /// Allows unsized rvalues at arguments and parameters. |
| (incomplete, unsized_locals, "1.30.0", Some(48055), None), |
| /// Allows unsized tuple coercion. |
| (active, unsized_tuple_coercion, "1.20.0", Some(42877), None), |
| /// Allows using the `#[used(linker)]` (or `#[used(compiler)]`) attribute. |
| (active, used_with_arg, "1.60.0", Some(93798), None), |
| /// Allows `extern "wasm" fn` |
| (active, wasm_abi, "1.53.0", Some(83788), None), |
| /// Allows `do yeet` expressions |
| (active, yeet_expr, "1.62.0", Some(96373), None), |
| // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
| // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way. |
| // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
| |
| // ------------------------------------------------------------------------- |
| // feature-group-end: actual feature gates |
| // ------------------------------------------------------------------------- |
| ); |
| |
| /// Some features are not allowed to be used together at the same time, if |
| /// the two are present, produce an error. |
| /// |
| /// Currently empty, but we will probably need this again in the future, |
| /// so let's keep it in for now. |
| pub const INCOMPATIBLE_FEATURES: &[(Symbol, Symbol)] = &[]; |
