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e1599b0c XL |
1 | //! List of the active feature gates. |
2 | ||
1b1a35ee | 3 | use super::{to_nonzero, Feature, State}; |
e1599b0c | 4 | |
5e7ed085 | 5 | use rustc_data_structures::fx::FxHashSet; |
dfeec247 XL |
6 | use rustc_span::edition::Edition; |
7 | use rustc_span::symbol::{sym, Symbol}; | |
8 | use rustc_span::Span; | |
e1599b0c XL |
9 | |
10 | macro_rules! set { | |
11 | ($field: ident) => {{ | |
12 | fn f(features: &mut Features, _: Span) { | |
13 | features.$field = true; | |
14 | } | |
15 | f as fn(&mut Features, Span) | |
dfeec247 | 16 | }}; |
e1599b0c XL |
17 | } |
18 | ||
19 | macro_rules! declare_features { | |
136023e0 XL |
20 | (__status_to_bool active) => { |
21 | false | |
22 | }; | |
23 | (__status_to_bool incomplete) => { | |
24 | true | |
25 | }; | |
e1599b0c | 26 | ($( |
136023e0 | 27 | $(#[doc = $doc:tt])* ($status:ident, $feature:ident, $ver:expr, $issue:expr, $edition:expr), |
e1599b0c XL |
28 | )+) => { |
29 | /// Represents active features that are currently being implemented or | |
30 | /// currently being considered for addition/removal. | |
31 | pub const ACTIVE_FEATURES: | |
32 | &[Feature] = | |
33 | &[$( | |
34 | // (sym::$feature, $ver, $issue, $edition, set!($feature)) | |
35 | Feature { | |
36 | state: State::Active { set: set!($feature) }, | |
37 | name: sym::$feature, | |
38 | since: $ver, | |
1b1a35ee | 39 | issue: to_nonzero($issue), |
e1599b0c | 40 | edition: $edition, |
e1599b0c XL |
41 | } |
42 | ),+]; | |
43 | ||
44 | /// A set of features to be used by later passes. | |
5869c6ff | 45 | #[derive(Clone, Default, Debug)] |
e1599b0c XL |
46 | pub struct Features { |
47 | /// `#![feature]` attrs for language features, for error reporting. | |
48 | pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>, | |
49 | /// `#![feature]` attrs for non-language (library) features. | |
50 | pub declared_lib_features: Vec<(Symbol, Span)>, | |
5e7ed085 FG |
51 | /// Features enabled for this crate. |
52 | pub active_features: FxHashSet<Symbol>, | |
e1599b0c XL |
53 | $( |
54 | $(#[doc = $doc])* | |
55 | pub $feature: bool | |
56 | ),+ | |
57 | } | |
58 | ||
59 | impl Features { | |
60c5eb7d XL |
60 | pub fn walk_feature_fields(&self, mut f: impl FnMut(&str, bool)) { |
61 | $(f(stringify!($feature), self.$feature);)+ | |
e1599b0c XL |
62 | } |
63 | ||
5e7ed085 FG |
64 | /// Is the given feature active? |
65 | pub fn active(&self, feature: Symbol) -> bool { | |
66 | self.active_features.contains(&feature) | |
67 | } | |
68 | ||
60c5eb7d XL |
69 | /// Is the given feature enabled? |
70 | /// | |
71 | /// Panics if the symbol doesn't correspond to a declared feature. | |
72 | pub fn enabled(&self, feature: Symbol) -> bool { | |
73 | match feature { | |
74 | $( sym::$feature => self.$feature, )* | |
75 | ||
76 | _ => panic!("`{}` was not listed in `declare_features`", feature), | |
77 | } | |
e1599b0c | 78 | } |
cdc7bbd5 | 79 | |
136023e0 XL |
80 | /// Some features are known to be incomplete and using them is likely to have |
81 | /// unanticipated results, such as compiler crashes. We warn the user about these | |
82 | /// to alert them. | |
83 | pub fn incomplete(&self, feature: Symbol) -> bool { | |
84 | match feature { | |
85 | $( | |
86 | sym::$feature => declare_features!(__status_to_bool $status), | |
87 | )* | |
88 | // accepted and removed features aren't in this file but are never incomplete | |
89 | _ if self.declared_lang_features.iter().any(|f| f.0 == feature) => false, | |
90 | _ if self.declared_lib_features.iter().any(|f| f.0 == feature) => false, | |
91 | _ => panic!("`{}` was not listed in `declare_features`", feature), | |
92 | } | |
93 | } | |
e1599b0c XL |
94 | } |
95 | }; | |
96 | } | |
97 | ||
98 | impl Feature { | |
99 | /// Sets this feature in `Features`. Panics if called on a non-active feature. | |
100 | pub fn set(&self, features: &mut Features, span: Span) { | |
101 | match self.state { | |
102 | State::Active { set } => set(features, span), | |
dfeec247 | 103 | _ => panic!("called `set` on feature `{}` which is not `active`", self.name), |
e1599b0c XL |
104 | } |
105 | } | |
106 | } | |
107 | ||
3c0e092e XL |
108 | // See https://rustc-dev-guide.rust-lang.org/feature-gates.html#feature-gates for more |
109 | // documentation about handling feature gates. | |
110 | // | |
e1599b0c XL |
111 | // If you change this, please modify `src/doc/unstable-book` as well. |
112 | // | |
3c0e092e XL |
113 | // Don't ever remove anything from this list; move them to `accepted.rs` if |
114 | // accepted or `removed.rs` if removed. | |
e1599b0c XL |
115 | // |
116 | // The version numbers here correspond to the version in which the current status | |
117 | // was set. This is most important for knowing when a particular feature became | |
118 | // stable (active). | |
119 | // | |
120 | // Note that the features are grouped into internal/user-facing and then | |
121 | // sorted by version inside those groups. This is enforced with tidy. | |
122 | // | |
123 | // N.B., `tools/tidy/src/features.rs` parses this information directly out of the | |
124 | // source, so take care when modifying it. | |
125 | ||
dfeec247 | 126 | #[rustfmt::skip] |
e1599b0c XL |
127 | declare_features! ( |
128 | // ------------------------------------------------------------------------- | |
3c0e092e | 129 | // feature-group-start: internal feature gates (no tracking issue) |
e1599b0c | 130 | // ------------------------------------------------------------------------- |
e1599b0c XL |
131 | // no-tracking-issue-start |
132 | ||
3c0e092e XL |
133 | /// Allows using the `thiscall` ABI. |
134 | (active, abi_thiscall, "1.19.0", None, None), | |
135 | /// Allows using the `unadjusted` ABI; perma-unstable. | |
136 | (active, abi_unadjusted, "1.16.0", None, None), | |
137 | /// Allows using the `vectorcall` ABI. | |
138 | (active, abi_vectorcall, "1.7.0", None, None), | |
139 | /// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`. | |
140 | (active, allocator_internals, "1.20.0", None, None), | |
141 | /// Allows using `#[allow_internal_unsafe]`. This is an | |
e1599b0c XL |
142 | /// attribute on `macro_rules!` and can't use the attribute handling |
143 | /// below (it has to be checked before expansion possibly makes | |
144 | /// macros disappear). | |
3c0e092e XL |
145 | (active, allow_internal_unsafe, "1.0.0", None, None), |
146 | /// Allows using `#[allow_internal_unstable]`. This is an | |
e1599b0c XL |
147 | /// attribute on `macro_rules!` and can't use the attribute handling |
148 | /// below (it has to be checked before expansion possibly makes | |
149 | /// macros disappear). | |
3c0e092e | 150 | (active, allow_internal_unstable, "1.0.0", None, None), |
e1599b0c XL |
151 | /// Allows identifying the `compiler_builtins` crate. |
152 | (active, compiler_builtins, "1.13.0", None, None), | |
923072b8 FG |
153 | /// Outputs useful `assert!` messages |
154 | (active, generic_assert, "1.63.0", None, None), | |
3c0e092e XL |
155 | /// Allows using the `rust-intrinsic`'s "ABI". |
156 | (active, intrinsics, "1.0.0", None, None), | |
157 | /// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic. | |
158 | (active, lang_items, "1.0.0", None, None), | |
159 | /// Allows `#[repr(no_niche)]` (an implementation detail of `rustc`, | |
160 | /// it is not on path for eventual stabilization). | |
161 | (active, no_niche, "1.42.0", None, None), | |
162 | /// Allows using `#[omit_gdb_pretty_printer_section]`. | |
163 | (active, omit_gdb_pretty_printer_section, "1.5.0", None, None), | |
164 | /// Allows using `#[prelude_import]` on glob `use` items. | |
165 | (active, prelude_import, "1.2.0", None, None), | |
e1599b0c XL |
166 | /// Used to identify crates that contain the profiler runtime. |
167 | (active, profiler_runtime, "1.18.0", None, None), | |
3c0e092e XL |
168 | /// Allows using `rustc_*` attributes (RFC 572). |
169 | (active, rustc_attrs, "1.0.0", None, None), | |
170 | /// Allows using the `#[stable]` and `#[unstable]` attributes. | |
171 | (active, staged_api, "1.0.0", None, None), | |
e1599b0c | 172 | /// Added for testing E0705; perma-unstable. |
60c5eb7d | 173 | (active, test_2018_feature, "1.31.0", None, Some(Edition::Edition2018)), |
5e7ed085 FG |
174 | /// Added for testing unstable lints; perma-unstable. |
175 | (active, test_unstable_lint, "1.60.0", None, None), | |
5099ac24 FG |
176 | /// Allows non-`unsafe` —and thus, unsound— access to `Pin` constructions. |
177 | /// Marked `incomplete` since perma-unstable and unsound. | |
178 | (incomplete, unsafe_pin_internals, "1.60.0", None, None), | |
179 | /// Use for stable + negative coherence and strict coherence depending on trait's | |
180 | /// rustc_strict_coherence value. | |
181 | (active, with_negative_coherence, "1.60.0", None, None), | |
3c0e092e XL |
182 | // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
183 | // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way. | |
184 | // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! | |
60c5eb7d | 185 | |
3c0e092e XL |
186 | // no-tracking-issue-end |
187 | // ------------------------------------------------------------------------- | |
188 | // feature-group-end: internal feature gates (no tracking issue) | |
189 | // ------------------------------------------------------------------------- | |
74b04a01 | 190 | |
3c0e092e XL |
191 | // ------------------------------------------------------------------------- |
192 | // feature-group-start: internal feature gates | |
193 | // ------------------------------------------------------------------------- | |
29967ef6 | 194 | |
fc512014 XL |
195 | /// Allows features specific to auto traits. |
196 | /// Renamed from `optin_builtin_traits`. | |
197 | (active, auto_traits, "1.50.0", Some(13231), None), | |
3c0e092e XL |
198 | /// Allows using `box` in patterns (RFC 469). |
199 | (active, box_patterns, "1.0.0", Some(29641), None), | |
200 | /// Allows using the `box $expr` syntax. | |
201 | (active, box_syntax, "1.0.0", Some(49733), None), | |
cdc7bbd5 XL |
202 | /// Allows `#[doc(notable_trait)]`. |
203 | /// Renamed from `doc_spotlight`. | |
204 | (active, doc_notable_trait, "1.52.0", Some(45040), None), | |
3c0e092e XL |
205 | /// Allows using the `may_dangle` attribute (RFC 1327). |
206 | (active, dropck_eyepatch, "1.10.0", Some(34761), None), | |
207 | /// Allows using the `#[fundamental]` attribute. | |
208 | (active, fundamental, "1.0.0", Some(29635), None), | |
209 | /// Allows using `#[link_name="llvm.*"]`. | |
210 | (active, link_llvm_intrinsics, "1.0.0", Some(29602), None), | |
211 | /// Allows using the `#[linkage = ".."]` attribute. | |
212 | (active, linkage, "1.0.0", Some(29603), None), | |
213 | /// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed. | |
214 | (active, needs_panic_runtime, "1.10.0", Some(32837), None), | |
215 | /// Allows using the `#![panic_runtime]` attribute. | |
216 | (active, panic_runtime, "1.10.0", Some(32837), None), | |
217 | /// Allows using `#[rustc_allow_const_fn_unstable]`. | |
218 | /// This is an attribute on `const fn` for the same | |
219 | /// purpose as `#[allow_internal_unstable]`. | |
220 | (active, rustc_allow_const_fn_unstable, "1.49.0", Some(69399), None), | |
221 | /// Allows using compiler's own crates. | |
222 | (active, rustc_private, "1.0.0", Some(27812), None), | |
223 | /// Allows using internal rustdoc features like `doc(primitive)` or `doc(keyword)`. | |
224 | (active, rustdoc_internals, "1.58.0", Some(90418), None), | |
225 | /// Allows using `#[start]` on a function indicating that it is the program entrypoint. | |
226 | (active, start, "1.0.0", Some(29633), None), | |
227 | /// Allows using `#[structural_match]` which indicates that a type is structurally matchable. | |
228 | /// FIXME: Subsumed by trait `StructuralPartialEq`, cannot move to removed until a library | |
229 | /// feature with the same name exists. | |
230 | (active, structural_match, "1.8.0", Some(31434), None), | |
231 | /// Allows using the `rust-call` ABI. | |
232 | (active, unboxed_closures, "1.0.0", Some(29625), None), | |
233 | // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! | |
234 | // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way. | |
235 | // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! | |
e1599b0c XL |
236 | |
237 | // ------------------------------------------------------------------------- | |
238 | // feature-group-end: internal feature gates | |
239 | // ------------------------------------------------------------------------- | |
240 | ||
241 | // ------------------------------------------------------------------------- | |
242 | // feature-group-start: actual feature gates (target features) | |
243 | // ------------------------------------------------------------------------- | |
244 | ||
245 | // FIXME: Document these and merge with the list below. | |
246 | ||
247 | // Unstable `#[target_feature]` directives. | |
5e7ed085 | 248 | (active, aarch64_ver_target_feature, "1.27.0", Some(44839), None), |
3c0e092e XL |
249 | (active, arm_target_feature, "1.27.0", Some(44839), None), |
250 | (active, avx512_target_feature, "1.27.0", Some(44839), None), | |
251 | (active, bpf_target_feature, "1.54.0", Some(44839), None), | |
252 | (active, cmpxchg16b_target_feature, "1.32.0", Some(44839), None), | |
253 | (active, ermsb_target_feature, "1.49.0", Some(44839), None), | |
254 | (active, f16c_target_feature, "1.36.0", Some(44839), None), | |
e1599b0c | 255 | (active, hexagon_target_feature, "1.27.0", Some(44839), None), |
e1599b0c | 256 | (active, mips_target_feature, "1.27.0", Some(44839), None), |
3c0e092e XL |
257 | (active, movbe_target_feature, "1.34.0", Some(44839), None), |
258 | (active, powerpc_target_feature, "1.27.0", Some(44839), None), | |
259 | (active, riscv_target_feature, "1.45.0", Some(44839), None), | |
260 | (active, rtm_target_feature, "1.35.0", Some(44839), None), | |
e1599b0c XL |
261 | (active, sse4a_target_feature, "1.27.0", Some(44839), None), |
262 | (active, tbm_target_feature, "1.27.0", Some(44839), None), | |
263 | (active, wasm_target_feature, "1.30.0", Some(44839), None), | |
3c0e092e XL |
264 | // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
265 | // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way. | |
266 | // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! | |
e1599b0c XL |
267 | |
268 | // ------------------------------------------------------------------------- | |
269 | // feature-group-end: actual feature gates (target features) | |
270 | // ------------------------------------------------------------------------- | |
271 | ||
272 | // ------------------------------------------------------------------------- | |
273 | // feature-group-start: actual feature gates | |
274 | // ------------------------------------------------------------------------- | |
275 | ||
3c0e092e XL |
276 | /// Allows using the `amdgpu-kernel` ABI. |
277 | (active, abi_amdgpu_kernel, "1.29.0", Some(51575), None), | |
278 | /// Allows `extern "avr-interrupt" fn()` and `extern "avr-non-blocking-interrupt" fn()`. | |
279 | (active, abi_avr_interrupt, "1.45.0", Some(69664), None), | |
280 | /// Allows `extern "C-cmse-nonsecure-call" fn()`. | |
281 | (active, abi_c_cmse_nonsecure_call, "1.51.0", Some(81391), None), | |
282 | /// Allows using the `efiapi` ABI. | |
283 | (active, abi_efiapi, "1.40.0", Some(65815), None), | |
284 | /// Allows `extern "msp430-interrupt" fn()`. | |
285 | (active, abi_msp430_interrupt, "1.16.0", Some(38487), None), | |
286 | /// Allows `extern "ptx-*" fn()`. | |
287 | (active, abi_ptx, "1.15.0", Some(38788), None), | |
288 | /// Allows `extern "x86-interrupt" fn()`. | |
289 | (active, abi_x86_interrupt, "1.17.0", Some(40180), None), | |
290 | /// Allows additional const parameter types, such as `&'static str` or user defined types | |
5e7ed085 | 291 | (incomplete, adt_const_params, "1.56.0", Some(95174), None), |
3c0e092e XL |
292 | /// Allows defining an `#[alloc_error_handler]`. |
293 | (active, alloc_error_handler, "1.29.0", Some(51540), None), | |
3c0e092e XL |
294 | /// Allows explicit discriminants on non-unit enum variants. |
295 | (active, arbitrary_enum_discriminant, "1.37.0", Some(60553), None), | |
296 | /// Allows trait methods with arbitrary self types. | |
297 | (active, arbitrary_self_types, "1.23.0", Some(44874), None), | |
298 | /// Allows using `const` operands in inline assembly. | |
5099ac24 | 299 | (active, asm_const, "1.58.0", Some(93332), None), |
3c0e092e | 300 | /// Enables experimental inline assembly support for additional architectures. |
5099ac24 | 301 | (active, asm_experimental_arch, "1.58.0", Some(93335), None), |
3c0e092e | 302 | /// Allows using `sym` operands in inline assembly. |
5099ac24 | 303 | (active, asm_sym, "1.58.0", Some(93333), None), |
a2a8927a | 304 | /// Allows the `may_unwind` option in inline assembly. |
5099ac24 FG |
305 | (active, asm_unwind, "1.58.0", Some(93334), None), |
306 | /// Allows users to enforce equality of associated constants `TraitImpl<AssocConst=3>`. | |
307 | (active, associated_const_equality, "1.58.0", Some(92827), None), | |
3c0e092e XL |
308 | /// Allows the user of associated type bounds. |
309 | (active, associated_type_bounds, "1.34.0", Some(52662), None), | |
e1599b0c XL |
310 | /// Allows associated type defaults. |
311 | (active, associated_type_defaults, "1.2.0", Some(29661), None), | |
3c0e092e XL |
312 | /// Allows `async || body` closures. |
313 | (active, async_closure, "1.37.0", Some(62290), None), | |
314 | /// Allows `extern "C-unwind" fn` to enable unwinding across ABI boundaries. | |
315 | (active, c_unwind, "1.52.0", Some(74990), None), | |
316 | /// Allows using C-variadics. | |
317 | (active, c_variadic, "1.34.0", Some(44930), None), | |
318 | /// Allows capturing disjoint fields in a closure/generator (RFC 2229). | |
319 | (incomplete, capture_disjoint_fields, "1.49.0", Some(53488), None), | |
3c0e092e XL |
320 | /// Allows the use of `#[cfg(sanitize = "option")]`; set when -Zsanitizer is used. |
321 | (active, cfg_sanitize, "1.41.0", Some(39699), None), | |
322 | /// Allows `cfg(target_abi = "...")`. | |
323 | (active, cfg_target_abi, "1.55.0", Some(80970), None), | |
923072b8 FG |
324 | /// Allows `cfg(target(abi = "..."))`. |
325 | (active, cfg_target_compact, "1.63.0", Some(96901), None), | |
5099ac24 FG |
326 | /// Allows `cfg(target_has_atomic_load_store = "...")`. |
327 | (active, cfg_target_has_atomic, "1.60.0", Some(94039), None), | |
328 | /// Allows `cfg(target_has_atomic_equal_alignment = "...")`. | |
329 | (active, cfg_target_has_atomic_equal_alignment, "1.60.0", Some(93822), None), | |
3c0e092e XL |
330 | /// Allows `cfg(target_thread_local)`. |
331 | (active, cfg_target_thread_local, "1.7.0", Some(29594), None), | |
332 | /// Allow conditional compilation depending on rust version | |
333 | (active, cfg_version, "1.45.0", Some(64796), None), | |
334 | /// Allows `#[track_caller]` on closures and generators. | |
335 | (active, closure_track_caller, "1.57.0", Some(87417), None), | |
336 | /// Allows to use the `#[cmse_nonsecure_entry]` attribute. | |
337 | (active, cmse_nonsecure_entry, "1.48.0", Some(75835), None), | |
338 | /// Allows `async {}` expressions in const contexts. | |
339 | (active, const_async_blocks, "1.53.0", Some(85368), None), | |
340 | // Allows limiting the evaluation steps of const expressions | |
341 | (active, const_eval_limit, "1.43.0", Some(67217), None), | |
342 | /// Allows the definition of `const extern fn` and `const unsafe extern fn`. | |
343 | (active, const_extern_fn, "1.40.0", Some(64926), None), | |
344 | /// Allows basic arithmetic on floating point types in a `const fn`. | |
345 | (active, const_fn_floating_point_arithmetic, "1.48.0", Some(57241), None), | |
3c0e092e XL |
346 | /// Allows `for _ in _` loops in const contexts. |
347 | (active, const_for, "1.56.0", Some(87575), None), | |
3c0e092e XL |
348 | /// Allows using `&mut` in constant functions. |
349 | (active, const_mut_refs, "1.41.0", Some(57349), None), | |
350 | /// Be more precise when looking for live drops in a const context. | |
351 | (active, const_precise_live_drops, "1.46.0", Some(73255), None), | |
352 | /// Allows references to types with interior mutability within constants | |
353 | (active, const_refs_to_cell, "1.51.0", Some(80384), None), | |
354 | /// Allows `impl const Trait for T` syntax. | |
355 | (active, const_trait_impl, "1.42.0", Some(67792), None), | |
356 | /// Allows the `?` operator in const contexts. | |
357 | (active, const_try, "1.56.0", Some(74935), None), | |
3c0e092e XL |
358 | /// Allows non-builtin attributes in inner attribute position. |
359 | (active, custom_inner_attributes, "1.30.0", Some(54726), None), | |
360 | /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`. | |
361 | (active, custom_test_frameworks, "1.30.0", Some(50297), None), | |
04454e1e FG |
362 | /// Allows using `#[debugger_visualizer]`. |
363 | (active, debugger_visualizer, "1.62.0", Some(95939), None), | |
e1599b0c XL |
364 | /// Allows declarative macros 2.0 (`macro`). |
365 | (active, decl_macro, "1.17.0", Some(39412), None), | |
3c0e092e XL |
366 | /// Allows rustc to inject a default alloc_error_handler |
367 | (active, default_alloc_error_handler, "1.48.0", Some(66741), None), | |
368 | /// Allows default type parameters to influence type inference. | |
369 | (active, default_type_parameter_fallback, "1.3.0", Some(27336), None), | |
5e7ed085 FG |
370 | /// Allows using `#[deprecated_safe]` to deprecate the safeness of a function or trait |
371 | (active, deprecated_safe, "1.61.0", Some(94978), None), | |
372 | /// Allows having using `suggestion` in the `#[deprecated]` attribute. | |
373 | (active, deprecated_suggestion, "1.61.0", Some(94785), None), | |
3c0e092e XL |
374 | /// Tells rustdoc to automatically generate `#[doc(cfg(...))]`. |
375 | (active, doc_auto_cfg, "1.58.0", Some(43781), None), | |
e1599b0c XL |
376 | /// Allows `#[doc(cfg(...))]`. |
377 | (active, doc_cfg, "1.21.0", Some(43781), None), | |
3c0e092e XL |
378 | /// Allows `#[doc(cfg_hide(...))]`. |
379 | (active, doc_cfg_hide, "1.57.0", Some(43781), None), | |
e1599b0c XL |
380 | /// Allows `#[doc(masked)]`. |
381 | (active, doc_masked, "1.21.0", Some(44027), None), | |
3c0e092e XL |
382 | /// Allows `X..Y` patterns. |
383 | (active, exclusive_range_pattern, "1.11.0", Some(37854), None), | |
384 | /// Allows exhaustive pattern matching on types that contain uninhabited types. | |
385 | (active, exhaustive_patterns, "1.13.0", Some(51085), None), | |
e1599b0c XL |
386 | /// Allows defining `extern type`s. |
387 | (active, extern_types, "1.23.0", Some(43467), None), | |
3c0e092e XL |
388 | /// Allows the use of `#[ffi_const]` on foreign functions. |
389 | (active, ffi_const, "1.45.0", Some(58328), None), | |
390 | /// Allows the use of `#[ffi_pure]` on foreign functions. | |
391 | (active, ffi_pure, "1.45.0", Some(58329), None), | |
392 | /// Allows using `#[ffi_returns_twice]` on foreign functions. | |
393 | (active, ffi_returns_twice, "1.34.0", Some(58314), None), | |
394 | /// Allows using `#[repr(align(...))]` on function items | |
395 | (active, fn_align, "1.53.0", Some(82232), None), | |
396 | /// Allows defining generators. | |
397 | (active, generators, "1.21.0", Some(43122), None), | |
398 | /// Infer generic args for both consts and types. | |
399 | (active, generic_arg_infer, "1.55.0", Some(85077), None), | |
e1599b0c XL |
400 | /// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598). |
401 | (active, generic_associated_types, "1.23.0", Some(44265), None), | |
5e7ed085 FG |
402 | /// An extension to the `generic_associated_types` feature, allowing incomplete features. |
403 | (incomplete, generic_associated_types_extended, "1.61.0", Some(95451), None), | |
3c0e092e XL |
404 | /// Allows non-trivial generic constants which have to have wfness manually propagated to callers |
405 | (incomplete, generic_const_exprs, "1.56.0", Some(76560), None), | |
406 | /// Allows using `..X`, `..=X`, `...X`, and `X..` as a pattern. | |
407 | (active, half_open_range_patterns, "1.41.0", Some(67264), None), | |
408 | /// Allows `if let` guard in match arms. | |
409 | (active, if_let_guard, "1.47.0", Some(51114), None), | |
410 | /// Allows using imported `main` function | |
411 | (active, imported_main, "1.53.0", Some(28937), None), | |
3c0e092e XL |
412 | /// Allows associated types in inherent impls. |
413 | (incomplete, inherent_associated_types, "1.52.0", Some(8995), None), | |
414 | /// Allow anonymous constants from an inline `const` block | |
415 | (active, inline_const, "1.49.0", Some(76001), None), | |
416 | /// Allow anonymous constants from an inline `const` block in pattern position | |
417 | (incomplete, inline_const_pat, "1.58.0", Some(76001), None), | |
418 | /// Allows using `pointer` and `reference` in intra-doc links | |
419 | (active, intra_doc_pointers, "1.51.0", Some(80896), None), | |
420 | /// Allows `#[instruction_set(_)]` attribute | |
421 | (active, isa_attribute, "1.48.0", Some(74727), None), | |
e1599b0c XL |
422 | /// Allows `'a: { break 'a; }`. |
423 | (active, label_break_value, "1.28.0", Some(48594), None), | |
3c0e092e XL |
424 | // Allows setting the threshold for the `large_assignments` lint. |
425 | (active, large_assignments, "1.52.0", Some(83518), None), | |
426 | /// Allows `if/while p && let q = r && ...` chains. | |
5099ac24 | 427 | (active, let_chains, "1.37.0", Some(53667), None), |
3c0e092e XL |
428 | /// Allows `let...else` statements. |
429 | (active, let_else, "1.56.0", Some(87335), None), | |
430 | /// Allows `#[link(..., cfg(..))]`. | |
431 | (active, link_cfg, "1.14.0", Some(37406), None), | |
e1599b0c XL |
432 | /// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check. |
433 | (active, lint_reasons, "1.31.0", Some(54503), None), | |
5e7ed085 FG |
434 | /// Give access to additional metadata about declarative macro meta-variables. |
435 | (active, macro_metavar_expr, "1.61.0", Some(83527), None), | |
3c0e092e XL |
436 | /// Allows `#[marker]` on certain traits allowing overlapping implementations. |
437 | (active, marker_trait_attr, "1.30.0", Some(29864), None), | |
438 | /// A minimal, sound subset of specialization intended to be used by the | |
439 | /// standard library until the soundness issues with specialization | |
440 | /// are fixed. | |
441 | (active, min_specialization, "1.7.0", Some(31844), None), | |
442 | /// Allows qualified paths in struct expressions, struct patterns and tuple struct patterns. | |
443 | (active, more_qualified_paths, "1.54.0", Some(86935), None), | |
444 | /// Allows the `#[must_not_suspend]` attribute. | |
445 | (active, must_not_suspend, "1.57.0", Some(83310), None), | |
446 | /// Allows using `#[naked]` on functions. | |
447 | (active, naked_functions, "1.9.0", Some(32408), None), | |
3c0e092e XL |
448 | /// Allows specifying the as-needed link modifier |
449 | (active, native_link_modifiers_as_needed, "1.53.0", Some(81490), None), | |
3c0e092e XL |
450 | /// Allows specifying the verbatim link modifier |
451 | (active, native_link_modifiers_verbatim, "1.53.0", Some(81490), None), | |
3c0e092e XL |
452 | /// Allow negative trait implementations. |
453 | (active, negative_impls, "1.44.0", Some(68318), None), | |
454 | /// Allows the `!` type. Does not imply 'exhaustive_patterns' (below) any more. | |
455 | (active, never_type, "1.13.0", Some(35121), None), | |
456 | /// Allows diverging expressions to fall back to `!` rather than `()`. | |
457 | (active, never_type_fallback, "1.41.0", Some(65992), None), | |
3c0e092e XL |
458 | /// Allows `#![no_core]`. |
459 | (active, no_core, "1.3.0", Some(29639), None), | |
460 | /// Allows function attribute `#[no_coverage]`, to bypass coverage | |
461 | /// instrumentation of that function. | |
462 | (active, no_coverage, "1.53.0", Some(84605), None), | |
463 | /// Allows the use of `no_sanitize` attribute. | |
464 | (active, no_sanitize, "1.42.0", Some(39699), None), | |
465 | /// Allows using the `non_exhaustive_omitted_patterns` lint. | |
466 | (active, non_exhaustive_omitted_patterns_lint, "1.57.0", Some(89554), None), | |
467 | /// Allows making `dyn Trait` well-formed even if `Trait` is not object safe. | |
468 | /// In that case, `dyn Trait: Trait` does not hold. Moreover, coercions and | |
469 | /// casts in safe Rust to `dyn Trait` for such a `Trait` is also forbidden. | |
470 | (active, object_safe_for_dispatch, "1.40.0", Some(43561), None), | |
e1599b0c XL |
471 | /// Allows using `#[optimize(X)]`. |
472 | (active, optimize_attribute, "1.34.0", Some(54882), None), | |
3c0e092e XL |
473 | /// Allows `extern "platform-intrinsic" { ... }`. |
474 | (active, platform_intrinsics, "1.4.0", Some(27731), None), | |
475 | /// Allows using `#![plugin(myplugin)]`. | |
476 | (active, plugin, "1.0.0", Some(29597), None), | |
477 | /// Allows exhaustive integer pattern matching on `usize` and `isize`. | |
478 | (active, precise_pointer_size_matching, "1.32.0", Some(56354), None), | |
479 | /// Allows macro attributes on expressions, statements and non-inline modules. | |
480 | (active, proc_macro_hygiene, "1.30.0", Some(54727), None), | |
e74abb32 | 481 | /// Allows the use of raw-dylibs (RFC 2627). |
136023e0 | 482 | (incomplete, raw_dylib, "1.40.0", Some(58713), None), |
60c5eb7d XL |
483 | /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions. |
484 | (active, raw_ref_op, "1.41.0", Some(64490), None), | |
60c5eb7d XL |
485 | /// Allows using the `#[register_attr]` attribute. |
486 | (active, register_attr, "1.41.0", Some(66080), None), | |
60c5eb7d XL |
487 | /// Allows using the `#[register_tool]` attribute. |
488 | (active, register_tool, "1.41.0", Some(66079), None), | |
3c0e092e XL |
489 | /// Allows the `#[repr(i128)]` attribute for enums. |
490 | (incomplete, repr128, "1.16.0", Some(56071), None), | |
491 | /// Allows `repr(simd)` and importing the various simd intrinsics. | |
492 | (active, repr_simd, "1.4.0", Some(27731), None), | |
923072b8 FG |
493 | /// Allows `extern "rust-cold"`. |
494 | (active, rust_cold_cc, "1.63.0", Some(97544), None), | |
3c0e092e XL |
495 | /// Allows the use of SIMD types in functions declared in `extern` blocks. |
496 | (active, simd_ffi, "1.0.0", Some(27731), None), | |
497 | /// Allows specialization of implementations (RFC 1210). | |
498 | (incomplete, specialization, "1.7.0", Some(31844), None), | |
3c0e092e XL |
499 | /// Allows attributes on expressions and non-item statements. |
500 | (active, stmt_expr_attributes, "1.6.0", Some(15701), None), | |
04454e1e FG |
501 | /// Allows lints part of the strict provenance effort. |
502 | (active, strict_provenance, "1.61.0", Some(95228), None), | |
f9f354fc XL |
503 | /// Allows the use of `#[target_feature]` on safe functions. |
504 | (active, target_feature_11, "1.45.0", Some(69098), None), | |
3c0e092e XL |
505 | /// Allows using `#[thread_local]` on `static` items. |
506 | (active, thread_local, "1.0.0", Some(29594), None), | |
507 | /// Allows defining `trait X = A + B;` alias items. | |
508 | (active, trait_alias, "1.24.0", Some(41517), None), | |
509 | /// Allows upcasting trait objects via supertraits. | |
510 | /// Trait upcasting is casting, e.g., `dyn Foo -> dyn Bar` where `Foo: Bar`. | |
511 | (incomplete, trait_upcasting, "1.56.0", Some(65991), None), | |
512 | /// Allows #[repr(transparent)] on unions (RFC 2645). | |
513 | (active, transparent_unions, "1.37.0", Some(60405), None), | |
514 | /// Allows inconsistent bounds in where clauses. | |
515 | (active, trivial_bounds, "1.28.0", Some(48214), None), | |
516 | /// Allows using `try {...}` expressions. | |
517 | (active, try_blocks, "1.29.0", Some(31436), None), | |
518 | /// Allows `impl Trait` to be used inside type aliases (RFC 2515). | |
519 | (active, type_alias_impl_trait, "1.38.0", Some(63063), None), | |
520 | /// Allows the use of type ascription in expressions. | |
521 | (active, type_ascription, "1.6.0", Some(23416), None), | |
522 | /// Allows creation of instances of a struct by moving fields that have | |
523 | /// not changed from prior instances of the same struct (RFC #2528) | |
923072b8 | 524 | (active, type_changing_struct_update, "1.58.0", Some(86555), None), |
29967ef6 XL |
525 | /// Allows unsized fn parameters. |
526 | (active, unsized_fn_params, "1.49.0", Some(48055), None), | |
3c0e092e XL |
527 | /// Allows unsized rvalues at arguments and parameters. |
528 | (incomplete, unsized_locals, "1.30.0", Some(48055), None), | |
529 | /// Allows unsized tuple coercion. | |
530 | (active, unsized_tuple_coercion, "1.20.0", Some(42877), None), | |
531 | /// Allows `union`s to implement `Drop`. Moreover, `union`s may now include fields | |
532 | /// that don't implement `Copy` as long as they don't have any drop glue. | |
533 | /// This is checked recursively. On encountering type variable where no progress can be made, | |
534 | /// `T: Copy` is used as a substitute for "no drop glue". | |
535 | /// | |
536 | /// NOTE: A limited form of `union U { ... }` was accepted in 1.19.0. | |
537 | (active, untagged_unions, "1.13.0", Some(55149), None), | |
5099ac24 FG |
538 | /// Allows using the `#[used(linker)]` (or `#[used(compiler)]`) attribute. |
539 | (active, used_with_arg, "1.60.0", Some(93798), None), | |
cdc7bbd5 XL |
540 | /// Allows `extern "wasm" fn` |
541 | (active, wasm_abi, "1.53.0", Some(83788), None), | |
04454e1e FG |
542 | /// Allows `do yeet` expressions |
543 | (active, yeet_expr, "1.62.0", Some(96373), None), | |
3c0e092e XL |
544 | // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! |
545 | // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way. | |
546 | // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! | |
c295e0f8 | 547 | |
e1599b0c XL |
548 | // ------------------------------------------------------------------------- |
549 | // feature-group-end: actual feature gates | |
550 | // ------------------------------------------------------------------------- | |
551 | ); | |
552 | ||
1b1a35ee XL |
553 | /// Some features are not allowed to be used together at the same time, if |
554 | /// the two are present, produce an error. | |
5869c6ff XL |
555 | /// |
556 | /// Currently empty, but we will probably need this again in the future, | |
557 | /// so let's keep it in for now. | |
558 | pub const INCOMPATIBLE_FEATURES: &[(Symbol, Symbol)] = &[]; |