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e1599b0c XL |
1 | //! List of the active feature gates. |
2 | ||
1b1a35ee | 3 | use super::{to_nonzero, Feature, State}; |
e1599b0c | 4 | |
dfeec247 XL |
5 | use rustc_span::edition::Edition; |
6 | use rustc_span::symbol::{sym, Symbol}; | |
7 | use rustc_span::Span; | |
e1599b0c XL |
8 | |
9 | macro_rules! set { | |
10 | ($field: ident) => {{ | |
11 | fn f(features: &mut Features, _: Span) { | |
12 | features.$field = true; | |
13 | } | |
14 | f as fn(&mut Features, Span) | |
dfeec247 | 15 | }}; |
e1599b0c XL |
16 | } |
17 | ||
18 | macro_rules! declare_features { | |
19 | ($( | |
20 | $(#[doc = $doc:tt])* (active, $feature:ident, $ver:expr, $issue:expr, $edition:expr), | |
21 | )+) => { | |
22 | /// Represents active features that are currently being implemented or | |
23 | /// currently being considered for addition/removal. | |
24 | pub const ACTIVE_FEATURES: | |
25 | &[Feature] = | |
26 | &[$( | |
27 | // (sym::$feature, $ver, $issue, $edition, set!($feature)) | |
28 | Feature { | |
29 | state: State::Active { set: set!($feature) }, | |
30 | name: sym::$feature, | |
31 | since: $ver, | |
1b1a35ee | 32 | issue: to_nonzero($issue), |
e1599b0c XL |
33 | edition: $edition, |
34 | description: concat!($($doc,)*), | |
35 | } | |
36 | ),+]; | |
37 | ||
38 | /// A set of features to be used by later passes. | |
5869c6ff | 39 | #[derive(Clone, Default, Debug)] |
e1599b0c XL |
40 | pub struct Features { |
41 | /// `#![feature]` attrs for language features, for error reporting. | |
42 | pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>, | |
43 | /// `#![feature]` attrs for non-language (library) features. | |
44 | pub declared_lib_features: Vec<(Symbol, Span)>, | |
45 | $( | |
46 | $(#[doc = $doc])* | |
47 | pub $feature: bool | |
48 | ),+ | |
49 | } | |
50 | ||
51 | impl Features { | |
60c5eb7d XL |
52 | pub fn walk_feature_fields(&self, mut f: impl FnMut(&str, bool)) { |
53 | $(f(stringify!($feature), self.$feature);)+ | |
e1599b0c XL |
54 | } |
55 | ||
60c5eb7d XL |
56 | /// Is the given feature enabled? |
57 | /// | |
58 | /// Panics if the symbol doesn't correspond to a declared feature. | |
59 | pub fn enabled(&self, feature: Symbol) -> bool { | |
60 | match feature { | |
61 | $( sym::$feature => self.$feature, )* | |
62 | ||
63 | _ => panic!("`{}` was not listed in `declare_features`", feature), | |
64 | } | |
e1599b0c XL |
65 | } |
66 | } | |
67 | }; | |
68 | } | |
69 | ||
70 | impl Feature { | |
71 | /// Sets this feature in `Features`. Panics if called on a non-active feature. | |
72 | pub fn set(&self, features: &mut Features, span: Span) { | |
73 | match self.state { | |
74 | State::Active { set } => set(features, span), | |
dfeec247 | 75 | _ => panic!("called `set` on feature `{}` which is not `active`", self.name), |
e1599b0c XL |
76 | } |
77 | } | |
78 | } | |
79 | ||
80 | // If you change this, please modify `src/doc/unstable-book` as well. | |
81 | // | |
82 | // Don't ever remove anything from this list; move them to `removed.rs`. | |
83 | // | |
84 | // The version numbers here correspond to the version in which the current status | |
85 | // was set. This is most important for knowing when a particular feature became | |
86 | // stable (active). | |
87 | // | |
88 | // Note that the features are grouped into internal/user-facing and then | |
89 | // sorted by version inside those groups. This is enforced with tidy. | |
90 | // | |
91 | // N.B., `tools/tidy/src/features.rs` parses this information directly out of the | |
92 | // source, so take care when modifying it. | |
93 | ||
dfeec247 | 94 | #[rustfmt::skip] |
e1599b0c XL |
95 | declare_features! ( |
96 | // ------------------------------------------------------------------------- | |
97 | // feature-group-start: internal feature gates | |
98 | // ------------------------------------------------------------------------- | |
99 | ||
100 | // no-tracking-issue-start | |
101 | ||
74b04a01 XL |
102 | /// Allows using `rustc_*` attributes (RFC 572). |
103 | (active, rustc_attrs, "1.0.0", None, None), | |
104 | ||
e1599b0c XL |
105 | /// Allows using compiler's own crates. |
106 | (active, rustc_private, "1.0.0", Some(27812), None), | |
107 | ||
108 | /// Allows using the `rust-intrinsic`'s "ABI". | |
109 | (active, intrinsics, "1.0.0", None, None), | |
110 | ||
111 | /// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic. | |
112 | (active, lang_items, "1.0.0", None, None), | |
113 | ||
114 | /// Allows using the `#[stable]` and `#[unstable]` attributes. | |
115 | (active, staged_api, "1.0.0", None, None), | |
116 | ||
117 | /// Allows using `#[allow_internal_unstable]`. This is an | |
118 | /// attribute on `macro_rules!` and can't use the attribute handling | |
119 | /// below (it has to be checked before expansion possibly makes | |
120 | /// macros disappear). | |
121 | (active, allow_internal_unstable, "1.0.0", None, None), | |
122 | ||
123 | /// Allows using `#[allow_internal_unsafe]`. This is an | |
124 | /// attribute on `macro_rules!` and can't use the attribute handling | |
125 | /// below (it has to be checked before expansion possibly makes | |
126 | /// macros disappear). | |
127 | (active, allow_internal_unsafe, "1.0.0", None, None), | |
128 | ||
e1599b0c XL |
129 | /// no-tracking-issue-end |
130 | ||
131 | /// Allows using `#[link_name="llvm.*"]`. | |
132 | (active, link_llvm_intrinsics, "1.0.0", Some(29602), None), | |
133 | ||
e1599b0c XL |
134 | /// Allows using the `box $expr` syntax. |
135 | (active, box_syntax, "1.0.0", Some(49733), None), | |
136 | ||
137 | /// Allows using `#[main]` to replace the entrypoint `#[lang = "start"]` calls. | |
138 | (active, main, "1.0.0", Some(29634), None), | |
139 | ||
140 | /// Allows using `#[start]` on a function indicating that it is the program entrypoint. | |
141 | (active, start, "1.0.0", Some(29633), None), | |
142 | ||
143 | /// Allows using the `#[fundamental]` attribute. | |
144 | (active, fundamental, "1.0.0", Some(29635), None), | |
145 | ||
146 | /// Allows using the `rust-call` ABI. | |
147 | (active, unboxed_closures, "1.0.0", Some(29625), None), | |
148 | ||
149 | /// Allows using the `#[linkage = ".."]` attribute. | |
150 | (active, linkage, "1.0.0", Some(29603), None), | |
151 | ||
e1599b0c XL |
152 | /// Allows using `box` in patterns (RFC 469). |
153 | (active, box_patterns, "1.0.0", Some(29641), None), | |
154 | ||
155 | // no-tracking-issue-start | |
156 | ||
157 | /// Allows using `#[prelude_import]` on glob `use` items. | |
158 | (active, prelude_import, "1.2.0", None, None), | |
159 | ||
160 | // no-tracking-issue-end | |
161 | ||
162 | // no-tracking-issue-start | |
163 | ||
164 | /// Allows using `#[omit_gdb_pretty_printer_section]`. | |
165 | (active, omit_gdb_pretty_printer_section, "1.5.0", None, None), | |
166 | ||
167 | /// Allows using the `vectorcall` ABI. | |
168 | (active, abi_vectorcall, "1.7.0", None, None), | |
169 | ||
170 | // no-tracking-issue-end | |
171 | ||
172 | /// Allows using `#[structural_match]` which indicates that a type is structurally matchable. | |
ba9703b0 XL |
173 | /// FIXME: Subsumed by trait `StructuralPartialEq`, cannot move to removed until a library |
174 | /// feature with the same name exists. | |
e1599b0c XL |
175 | (active, structural_match, "1.8.0", Some(31434), None), |
176 | ||
177 | /// Allows using the `may_dangle` attribute (RFC 1327). | |
178 | (active, dropck_eyepatch, "1.10.0", Some(34761), None), | |
179 | ||
180 | /// Allows using the `#![panic_runtime]` attribute. | |
181 | (active, panic_runtime, "1.10.0", Some(32837), None), | |
182 | ||
183 | /// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed. | |
184 | (active, needs_panic_runtime, "1.10.0", Some(32837), None), | |
185 | ||
186 | // no-tracking-issue-start | |
187 | ||
188 | /// Allows identifying the `compiler_builtins` crate. | |
189 | (active, compiler_builtins, "1.13.0", None, None), | |
190 | ||
191 | /// Allows using the `unadjusted` ABI; perma-unstable. | |
192 | (active, abi_unadjusted, "1.16.0", None, None), | |
193 | ||
e1599b0c XL |
194 | /// Used to identify crates that contain the profiler runtime. |
195 | (active, profiler_runtime, "1.18.0", None, None), | |
196 | ||
197 | /// Allows using the `thiscall` ABI. | |
198 | (active, abi_thiscall, "1.19.0", None, None), | |
199 | ||
200 | /// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`. | |
201 | (active, allocator_internals, "1.20.0", None, None), | |
202 | ||
e1599b0c | 203 | /// Added for testing E0705; perma-unstable. |
60c5eb7d XL |
204 | (active, test_2018_feature, "1.31.0", None, Some(Edition::Edition2018)), |
205 | ||
74b04a01 XL |
206 | /// Allows `#[repr(no_niche)]` (an implementation detail of `rustc`, |
207 | /// it is not on path for eventual stabilization). | |
208 | (active, no_niche, "1.42.0", None, None), | |
209 | ||
29967ef6 XL |
210 | /// Allows using `#[rustc_allow_const_fn_unstable]`. |
211 | /// This is an attribute on `const fn` for the same | |
212 | /// purpose as `#[allow_internal_unstable]`. | |
213 | (active, rustc_allow_const_fn_unstable, "1.49.0", Some(69399), None), | |
214 | ||
fc512014 XL |
215 | /// Allows features specific to auto traits. |
216 | /// Renamed from `optin_builtin_traits`. | |
217 | (active, auto_traits, "1.50.0", Some(13231), None), | |
218 | ||
60c5eb7d | 219 | // no-tracking-issue-end |
e1599b0c XL |
220 | |
221 | // ------------------------------------------------------------------------- | |
222 | // feature-group-end: internal feature gates | |
223 | // ------------------------------------------------------------------------- | |
224 | ||
225 | // ------------------------------------------------------------------------- | |
226 | // feature-group-start: actual feature gates (target features) | |
227 | // ------------------------------------------------------------------------- | |
228 | ||
229 | // FIXME: Document these and merge with the list below. | |
230 | ||
231 | // Unstable `#[target_feature]` directives. | |
232 | (active, arm_target_feature, "1.27.0", Some(44839), None), | |
233 | (active, aarch64_target_feature, "1.27.0", Some(44839), None), | |
234 | (active, hexagon_target_feature, "1.27.0", Some(44839), None), | |
235 | (active, powerpc_target_feature, "1.27.0", Some(44839), None), | |
236 | (active, mips_target_feature, "1.27.0", Some(44839), None), | |
237 | (active, avx512_target_feature, "1.27.0", Some(44839), None), | |
e1599b0c XL |
238 | (active, sse4a_target_feature, "1.27.0", Some(44839), None), |
239 | (active, tbm_target_feature, "1.27.0", Some(44839), None), | |
240 | (active, wasm_target_feature, "1.30.0", Some(44839), None), | |
241 | (active, adx_target_feature, "1.32.0", Some(44839), None), | |
242 | (active, cmpxchg16b_target_feature, "1.32.0", Some(44839), None), | |
243 | (active, movbe_target_feature, "1.34.0", Some(44839), None), | |
244 | (active, rtm_target_feature, "1.35.0", Some(44839), None), | |
245 | (active, f16c_target_feature, "1.36.0", Some(44839), None), | |
f9f354fc | 246 | (active, riscv_target_feature, "1.45.0", Some(44839), None), |
29967ef6 | 247 | (active, ermsb_target_feature, "1.49.0", Some(44839), None), |
e1599b0c XL |
248 | |
249 | // ------------------------------------------------------------------------- | |
250 | // feature-group-end: actual feature gates (target features) | |
251 | // ------------------------------------------------------------------------- | |
252 | ||
253 | // ------------------------------------------------------------------------- | |
254 | // feature-group-start: actual feature gates | |
255 | // ------------------------------------------------------------------------- | |
256 | ||
257 | /// Allows using the `#[link_args]` attribute. | |
258 | (active, link_args, "1.0.0", Some(29596), None), | |
259 | ||
260 | /// Allows defining identifiers beyond ASCII. | |
261 | (active, non_ascii_idents, "1.0.0", Some(55467), None), | |
262 | ||
263 | /// Allows using `#[plugin_registrar]` on functions. | |
264 | (active, plugin_registrar, "1.0.0", Some(29597), None), | |
265 | ||
266 | /// Allows using `#![plugin(myplugin)]`. | |
267 | (active, plugin, "1.0.0", Some(29597), None), | |
268 | ||
269 | /// Allows using `#[thread_local]` on `static` items. | |
270 | (active, thread_local, "1.0.0", Some(29594), None), | |
271 | ||
272 | /// Allows the use of SIMD types in functions declared in `extern` blocks. | |
273 | (active, simd_ffi, "1.0.0", Some(27731), None), | |
274 | ||
e1599b0c XL |
275 | /// Allows using non lexical lifetimes (RFC 2094). |
276 | (active, nll, "1.0.0", Some(43234), None), | |
277 | ||
e1599b0c XL |
278 | /// Allows the definition of `const` functions with some advanced features. |
279 | (active, const_fn, "1.2.0", Some(57563), None), | |
280 | ||
281 | /// Allows associated type defaults. | |
282 | (active, associated_type_defaults, "1.2.0", Some(29661), None), | |
283 | ||
284 | /// Allows `#![no_core]`. | |
285 | (active, no_core, "1.3.0", Some(29639), None), | |
286 | ||
287 | /// Allows default type parameters to influence type inference. | |
288 | (active, default_type_parameter_fallback, "1.3.0", Some(27336), None), | |
289 | ||
290 | /// Allows `repr(simd)` and importing the various simd intrinsics. | |
291 | (active, repr_simd, "1.4.0", Some(27731), None), | |
292 | ||
293 | /// Allows `extern "platform-intrinsic" { ... }`. | |
294 | (active, platform_intrinsics, "1.4.0", Some(27731), None), | |
295 | ||
296 | /// Allows `#[unwind(..)]`. | |
297 | /// | |
298 | /// Permits specifying whether a function should permit unwinding or abort on unwind. | |
299 | (active, unwind_attributes, "1.4.0", Some(58760), None), | |
300 | ||
e1599b0c XL |
301 | /// Allows attributes on expressions and non-item statements. |
302 | (active, stmt_expr_attributes, "1.6.0", Some(15701), None), | |
303 | ||
304 | /// Allows the use of type ascription in expressions. | |
305 | (active, type_ascription, "1.6.0", Some(23416), None), | |
306 | ||
307 | /// Allows `cfg(target_thread_local)`. | |
308 | (active, cfg_target_thread_local, "1.7.0", Some(29594), None), | |
309 | ||
310 | /// Allows specialization of implementations (RFC 1210). | |
311 | (active, specialization, "1.7.0", Some(31844), None), | |
312 | ||
ba9703b0 XL |
313 | /// A minimal, sound subset of specialization intended to be used by the |
314 | /// standard library until the soundness issues with specialization | |
315 | /// are fixed. | |
316 | (active, min_specialization, "1.7.0", Some(31844), None), | |
317 | ||
e1599b0c XL |
318 | /// Allows using `#[naked]` on functions. |
319 | (active, naked_functions, "1.9.0", Some(32408), None), | |
320 | ||
321 | /// Allows `cfg(target_has_atomic = "...")`. | |
322 | (active, cfg_target_has_atomic, "1.9.0", Some(32976), None), | |
323 | ||
324 | /// Allows `X..Y` patterns. | |
325 | (active, exclusive_range_pattern, "1.11.0", Some(37854), None), | |
326 | ||
327 | /// Allows the `!` type. Does not imply 'exhaustive_patterns' (below) any more. | |
328 | (active, never_type, "1.13.0", Some(35121), None), | |
329 | ||
330 | /// Allows exhaustive pattern matching on types that contain uninhabited types. | |
331 | (active, exhaustive_patterns, "1.13.0", Some(51085), None), | |
332 | ||
e74abb32 XL |
333 | /// Allows `union`s to implement `Drop`. Moreover, `union`s may now include fields |
334 | /// that don't implement `Copy` as long as they don't have any drop glue. | |
335 | /// This is checked recursively. On encountering type variable where no progress can be made, | |
336 | /// `T: Copy` is used as a substitute for "no drop glue". | |
337 | /// | |
338 | /// NOTE: A limited form of `union U { ... }` was accepted in 1.19.0. | |
339 | (active, untagged_unions, "1.13.0", Some(55149), None), | |
e1599b0c XL |
340 | |
341 | /// Allows `#[link(..., cfg(..))]`. | |
342 | (active, link_cfg, "1.14.0", Some(37406), None), | |
343 | ||
344 | /// Allows `extern "ptx-*" fn()`. | |
345 | (active, abi_ptx, "1.15.0", Some(38788), None), | |
346 | ||
347 | /// Allows the `#[repr(i128)]` attribute for enums. | |
dfeec247 | 348 | (active, repr128, "1.16.0", Some(56071), None), |
e1599b0c XL |
349 | |
350 | /// Allows `#[link(kind="static-nobundle"...)]`. | |
351 | (active, static_nobundle, "1.16.0", Some(37403), None), | |
352 | ||
353 | /// Allows `extern "msp430-interrupt" fn()`. | |
354 | (active, abi_msp430_interrupt, "1.16.0", Some(38487), None), | |
355 | ||
356 | /// Allows declarative macros 2.0 (`macro`). | |
357 | (active, decl_macro, "1.17.0", Some(39412), None), | |
358 | ||
359 | /// Allows `extern "x86-interrupt" fn()`. | |
360 | (active, abi_x86_interrupt, "1.17.0", Some(40180), None), | |
361 | ||
e1599b0c XL |
362 | /// Allows a test to fail without failing the whole suite. |
363 | (active, allow_fail, "1.19.0", Some(46488), None), | |
364 | ||
365 | /// Allows unsized tuple coercion. | |
366 | (active, unsized_tuple_coercion, "1.20.0", Some(42877), None), | |
367 | ||
368 | /// Allows defining generators. | |
369 | (active, generators, "1.21.0", Some(43122), None), | |
370 | ||
371 | /// Allows `#[doc(cfg(...))]`. | |
372 | (active, doc_cfg, "1.21.0", Some(43781), None), | |
373 | ||
374 | /// Allows `#[doc(masked)]`. | |
375 | (active, doc_masked, "1.21.0", Some(44027), None), | |
376 | ||
3dfed10e XL |
377 | /// Allows `#[doc(spotlight)]`. |
378 | (active, doc_spotlight, "1.22.0", Some(45040), None), | |
379 | ||
e1599b0c XL |
380 | /// Allows `#[doc(include = "some-file")]`. |
381 | (active, external_doc, "1.22.0", Some(44732), None), | |
382 | ||
e1599b0c XL |
383 | /// Allows using `crate` as visibility modifier, synonymous with `pub(crate)`. |
384 | (active, crate_visibility_modifier, "1.23.0", Some(53120), None), | |
385 | ||
386 | /// Allows defining `extern type`s. | |
387 | (active, extern_types, "1.23.0", Some(43467), None), | |
388 | ||
389 | /// Allows trait methods with arbitrary self types. | |
390 | (active, arbitrary_self_types, "1.23.0", Some(44874), None), | |
391 | ||
392 | /// Allows in-band quantification of lifetime bindings (e.g., `fn foo(x: &'a u8) -> &'a u8`). | |
393 | (active, in_band_lifetimes, "1.23.0", Some(44524), None), | |
394 | ||
395 | /// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598). | |
396 | (active, generic_associated_types, "1.23.0", Some(44265), None), | |
397 | ||
398 | /// Allows defining `trait X = A + B;` alias items. | |
399 | (active, trait_alias, "1.24.0", Some(41517), None), | |
400 | ||
74b04a01 | 401 | /// Allows inferring `'static` outlives requirements (RFC 2093). |
e1599b0c XL |
402 | (active, infer_static_outlives_requirements, "1.26.0", Some(54185), None), |
403 | ||
e1599b0c XL |
404 | /// Allows accessing fields of unions inside `const` functions. |
405 | (active, const_fn_union, "1.27.0", Some(51909), None), | |
406 | ||
407 | /// Allows casting raw pointers to `usize` during const eval. | |
408 | (active, const_raw_ptr_to_usize_cast, "1.27.0", Some(51910), None), | |
409 | ||
410 | /// Allows dereferencing raw pointers during const eval. | |
411 | (active, const_raw_ptr_deref, "1.27.0", Some(51911), None), | |
412 | ||
e1599b0c XL |
413 | /// Allows inconsistent bounds in where clauses. |
414 | (active, trivial_bounds, "1.28.0", Some(48214), None), | |
415 | ||
416 | /// Allows `'a: { break 'a; }`. | |
417 | (active, label_break_value, "1.28.0", Some(48594), None), | |
418 | ||
419 | /// Allows using `#[doc(keyword = "...")]`. | |
420 | (active, doc_keyword, "1.28.0", Some(51315), None), | |
421 | ||
e1599b0c XL |
422 | /// Allows using `try {...}` expressions. |
423 | (active, try_blocks, "1.29.0", Some(31436), None), | |
424 | ||
425 | /// Allows defining an `#[alloc_error_handler]`. | |
426 | (active, alloc_error_handler, "1.29.0", Some(51540), None), | |
427 | ||
428 | /// Allows using the `amdgpu-kernel` ABI. | |
429 | (active, abi_amdgpu_kernel, "1.29.0", Some(51575), None), | |
430 | ||
431 | /// Allows panicking during const eval (producing compile-time errors). | |
432 | (active, const_panic, "1.30.0", Some(51999), None), | |
433 | ||
434 | /// Allows `#[marker]` on certain traits allowing overlapping implementations. | |
435 | (active, marker_trait_attr, "1.30.0", Some(29864), None), | |
436 | ||
f9f354fc | 437 | /// Allows macro attributes on expressions, statements and non-inline modules. |
e1599b0c XL |
438 | (active, proc_macro_hygiene, "1.30.0", Some(54727), None), |
439 | ||
440 | /// Allows unsized rvalues at arguments and parameters. | |
441 | (active, unsized_locals, "1.30.0", Some(48055), None), | |
442 | ||
443 | /// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`. | |
444 | (active, custom_test_frameworks, "1.30.0", Some(50297), None), | |
445 | ||
446 | /// Allows non-builtin attributes in inner attribute position. | |
447 | (active, custom_inner_attributes, "1.30.0", Some(54726), None), | |
448 | ||
449 | /// Allows `impl Trait` in bindings (`let`, `const`, `static`). | |
450 | (active, impl_trait_in_bindings, "1.30.0", Some(63065), None), | |
451 | ||
452 | /// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check. | |
453 | (active, lint_reasons, "1.31.0", Some(54503), None), | |
454 | ||
455 | /// Allows exhaustive integer pattern matching on `usize` and `isize`. | |
456 | (active, precise_pointer_size_matching, "1.32.0", Some(56354), None), | |
457 | ||
e1599b0c XL |
458 | /// Allows using `#[ffi_returns_twice]` on foreign functions. |
459 | (active, ffi_returns_twice, "1.34.0", Some(58314), None), | |
460 | ||
461 | /// Allows const generic types (e.g. `struct Foo<const N: usize>(...);`). | |
462 | (active, const_generics, "1.34.0", Some(44580), None), | |
463 | ||
464 | /// Allows using `#[optimize(X)]`. | |
465 | (active, optimize_attribute, "1.34.0", Some(54882), None), | |
466 | ||
467 | /// Allows using C-variadics. | |
468 | (active, c_variadic, "1.34.0", Some(44930), None), | |
469 | ||
470 | /// Allows the user of associated type bounds. | |
471 | (active, associated_type_bounds, "1.34.0", Some(52662), None), | |
472 | ||
e1599b0c XL |
473 | /// Allows `if/while p && let q = r && ...` chains. |
474 | (active, let_chains, "1.37.0", Some(53667), None), | |
475 | ||
e1599b0c XL |
476 | /// Allows #[repr(transparent)] on unions (RFC 2645). |
477 | (active, transparent_unions, "1.37.0", Some(60405), None), | |
478 | ||
479 | /// Allows explicit discriminants on non-unit enum variants. | |
480 | (active, arbitrary_enum_discriminant, "1.37.0", Some(60553), None), | |
481 | ||
482 | /// Allows `impl Trait` with multiple unrelated lifetimes. | |
dfeec247 | 483 | (active, member_constraints, "1.37.0", Some(61997), None), |
e1599b0c XL |
484 | |
485 | /// Allows `async || body` closures. | |
486 | (active, async_closure, "1.37.0", Some(62290), None), | |
487 | ||
e1599b0c XL |
488 | /// Allows `impl Trait` to be used inside type aliases (RFC 2515). |
489 | (active, type_alias_impl_trait, "1.38.0", Some(63063), None), | |
490 | ||
491 | /// Allows the use of or-patterns (e.g., `0 | 1`). | |
492 | (active, or_patterns, "1.38.0", Some(54883), None), | |
493 | ||
e74abb32 XL |
494 | /// Allows the definition of `const extern fn` and `const unsafe extern fn`. |
495 | (active, const_extern_fn, "1.40.0", Some(64926), None), | |
496 | ||
497 | /// Allows the use of raw-dylibs (RFC 2627). | |
498 | (active, raw_dylib, "1.40.0", Some(58713), None), | |
499 | ||
e74abb32 XL |
500 | /// Allows making `dyn Trait` well-formed even if `Trait` is not object safe. |
501 | /// In that case, `dyn Trait: Trait` does not hold. Moreover, coercions and | |
502 | /// casts in safe Rust to `dyn Trait` for such a `Trait` is also forbidden. | |
503 | (active, object_safe_for_dispatch, "1.40.0", Some(43561), None), | |
504 | ||
505 | /// Allows using the `efiapi` ABI. | |
506 | (active, abi_efiapi, "1.40.0", Some(65815), None), | |
507 | ||
60c5eb7d XL |
508 | /// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions. |
509 | (active, raw_ref_op, "1.41.0", Some(64490), None), | |
510 | ||
511 | /// Allows diverging expressions to fall back to `!` rather than `()`. | |
512 | (active, never_type_fallback, "1.41.0", Some(65992), None), | |
513 | ||
514 | /// Allows using the `#[register_attr]` attribute. | |
515 | (active, register_attr, "1.41.0", Some(66080), None), | |
516 | ||
517 | /// Allows using the `#[register_tool]` attribute. | |
518 | (active, register_tool, "1.41.0", Some(66079), None), | |
519 | ||
60c5eb7d XL |
520 | /// Allows the use of `#[cfg(sanitize = "option")]`; set when -Zsanitizer is used. |
521 | (active, cfg_sanitize, "1.41.0", Some(39699), None), | |
522 | ||
dfeec247 XL |
523 | /// Allows using `..X`, `..=X`, `...X`, and `X..` as a pattern. |
524 | (active, half_open_range_patterns, "1.41.0", Some(67264), None), | |
525 | ||
60c5eb7d XL |
526 | /// Allows using `&mut` in constant functions. |
527 | (active, const_mut_refs, "1.41.0", Some(57349), None), | |
528 | ||
dfeec247 XL |
529 | /// Allows bindings in the subpattern of a binding pattern. |
530 | /// For example, you can write `x @ Some(y)`. | |
531 | (active, bindings_after_at, "1.41.0", Some(65490), None), | |
532 | ||
533 | /// Allows `impl const Trait for T` syntax. | |
534 | (active, const_trait_impl, "1.42.0", Some(67792), None), | |
535 | ||
536 | /// Allows `T: ?const Trait` syntax in bounds. | |
537 | (active, const_trait_bound_opt_out, "1.42.0", Some(67794), None), | |
538 | ||
74b04a01 XL |
539 | /// Allows the use of `no_sanitize` attribute. |
540 | (active, no_sanitize, "1.42.0", Some(39699), None), | |
541 | ||
542 | // Allows limiting the evaluation steps of const expressions | |
543 | (active, const_eval_limit, "1.43.0", Some(67217), None), | |
544 | ||
ba9703b0 XL |
545 | /// Allow negative trait implementations. |
546 | (active, negative_impls, "1.44.0", Some(68318), None), | |
547 | ||
f9f354fc XL |
548 | /// Allows the use of `#[target_feature]` on safe functions. |
549 | (active, target_feature_11, "1.45.0", Some(69098), None), | |
550 | ||
551 | /// Allow conditional compilation depending on rust version | |
552 | (active, cfg_version, "1.45.0", Some(64796), None), | |
553 | ||
554 | /// Allows the use of `#[ffi_pure]` on foreign functions. | |
555 | (active, ffi_pure, "1.45.0", Some(58329), None), | |
556 | ||
557 | /// Allows the use of `#[ffi_const]` on foreign functions. | |
558 | (active, ffi_const, "1.45.0", Some(58328), None), | |
559 | ||
f035d41b XL |
560 | /// Allows `extern "avr-interrupt" fn()` and `extern "avr-non-blocking-interrupt" fn()`. |
561 | (active, abi_avr_interrupt, "1.45.0", Some(69664), None), | |
562 | ||
563 | /// Be more precise when looking for live drops in a const context. | |
564 | (active, const_precise_live_drops, "1.46.0", Some(73255), None), | |
565 | ||
566 | /// Allows capturing variables in scope using format_args! | |
567 | (active, format_args_capture, "1.46.0", Some(67984), None), | |
568 | ||
569 | /// Lazily evaluate constants. This allows constants to depend on type parameters. | |
570 | (active, lazy_normalization_consts, "1.46.0", Some(72219), None), | |
571 | ||
3dfed10e | 572 | /// Allows calling `transmute` in const fn |
f035d41b XL |
573 | (active, const_fn_transmute, "1.46.0", Some(53605), None), |
574 | ||
3dfed10e XL |
575 | /// Allows `if let` guard in match arms. |
576 | (active, if_let_guard, "1.47.0", Some(51114), None), | |
577 | ||
5869c6ff | 578 | /// Allows non-trivial generic constants which have to be manually propagated upwards. |
1b1a35ee XL |
579 | (active, const_evaluatable_checked, "1.48.0", Some(76560), None), |
580 | ||
581 | /// Allows basic arithmetic on floating point types in a `const fn`. | |
582 | (active, const_fn_floating_point_arithmetic, "1.48.0", Some(57241), None), | |
583 | ||
584 | /// Allows using and casting function pointers in a `const fn`. | |
585 | (active, const_fn_fn_ptr_basics, "1.48.0", Some(57563), None), | |
586 | ||
587 | /// Allows to use the `#[cmse_nonsecure_entry]` attribute. | |
588 | (active, cmse_nonsecure_entry, "1.48.0", Some(75835), None), | |
589 | ||
29967ef6 XL |
590 | /// Allows rustc to inject a default alloc_error_handler |
591 | (active, default_alloc_error_handler, "1.48.0", Some(66741), None), | |
592 | ||
593 | /// Allows argument and return position `impl Trait` in a `const fn`. | |
594 | (active, const_impl_trait, "1.48.0", Some(77463), None), | |
595 | ||
596 | /// Allows `#[instruction_set(_)]` attribute | |
597 | (active, isa_attribute, "1.48.0", Some(74727), None), | |
598 | ||
599 | /// Allow anonymous constants from an inline `const` block | |
600 | (active, inline_const, "1.49.0", Some(76001), None), | |
601 | ||
602 | /// Allows unsized fn parameters. | |
603 | (active, unsized_fn_params, "1.49.0", Some(48055), None), | |
604 | ||
605 | /// Allows the use of destructuring assignments. | |
606 | (active, destructuring_assignment, "1.49.0", Some(71126), None), | |
607 | ||
608 | /// Enables `#[cfg(panic = "...")]` config key. | |
609 | (active, cfg_panic, "1.49.0", Some(77443), None), | |
610 | ||
fc512014 XL |
611 | /// Allows capturing disjoint fields in a closure/generator (RFC 2229). |
612 | (active, capture_disjoint_fields, "1.49.0", Some(53488), None), | |
613 | ||
614 | /// Allows arbitrary expressions in key-value attributes at parse time. | |
615 | (active, extended_key_value_attributes, "1.50.0", Some(78835), None), | |
616 | ||
5869c6ff XL |
617 | /// `:pat2018` and `:pat2021` macro matchers. |
618 | (active, edition_macro_pats, "1.51.0", Some(54883), None), | |
619 | ||
620 | /// Allows const generics to have default values (e.g. `struct Foo<const N: usize = 3>(...);`). | |
621 | (active, const_generics_defaults, "1.51.0", Some(44580), None), | |
622 | ||
623 | /// Allows references to types with interior mutability within constants | |
624 | (active, const_refs_to_cell, "1.51.0", Some(80384), None), | |
625 | ||
626 | /// Allows using `pointer` and `reference` in intra-doc links | |
627 | (active, intra_doc_pointers, "1.51.0", Some(80896), None), | |
628 | ||
629 | /// Allows `extern "C-cmse-nonsecure-call" fn()`. | |
630 | (active, abi_c_cmse_nonsecure_call, "1.51.0", Some(81391), None), | |
631 | ||
632 | /// Lessens the requirements for structs to implement `Unsize`. | |
6a06907d XL |
633 | (active, relaxed_struct_unsize, "1.51.0", Some(81793), None), |
634 | ||
635 | /// Allows macro attributes to observe output of `#[derive]`. | |
636 | (active, macro_attributes_in_derive_output, "1.51.0", Some(81119), None), | |
637 | ||
638 | /// Allows `pub` on `macro_rules` items. | |
639 | (active, pub_macro_rules, "1.52.0", Some(78855), None), | |
640 | ||
641 | /// Allows the use of type alias impl trait in function return positions | |
642 | (active, min_type_alias_impl_trait, "1.52.0", Some(63063), None), | |
643 | ||
644 | /// Allows associated types in inherent impls. | |
645 | (active, inherent_associated_types, "1.52.0", Some(8995), None), | |
646 | ||
647 | /// Allows `extern "C-unwind" fn` to enable unwinding across ABI boundaries. | |
648 | (active, c_unwind, "1.52.0", Some(74990), None), | |
649 | ||
e1599b0c XL |
650 | // ------------------------------------------------------------------------- |
651 | // feature-group-end: actual feature gates | |
652 | // ------------------------------------------------------------------------- | |
653 | ); | |
654 | ||
655 | /// Some features are known to be incomplete and using them is likely to have | |
656 | /// unanticipated results, such as compiler crashes. We warn the user about these | |
657 | /// to alert them. | |
658 | pub const INCOMPLETE_FEATURES: &[Symbol] = &[ | |
3dfed10e | 659 | sym::if_let_guard, |
e1599b0c XL |
660 | sym::impl_trait_in_bindings, |
661 | sym::generic_associated_types, | |
662 | sym::const_generics, | |
e1599b0c | 663 | sym::let_chains, |
e74abb32 | 664 | sym::raw_dylib, |
1b1a35ee | 665 | sym::const_evaluatable_checked, |
dfeec247 XL |
666 | sym::const_trait_impl, |
667 | sym::const_trait_bound_opt_out, | |
f035d41b XL |
668 | sym::lazy_normalization_consts, |
669 | sym::specialization, | |
29967ef6 XL |
670 | sym::inline_const, |
671 | sym::repr128, | |
672 | sym::unsized_locals, | |
fc512014 | 673 | sym::capture_disjoint_fields, |
5869c6ff | 674 | sym::const_generics_defaults, |
6a06907d XL |
675 | sym::inherent_associated_types, |
676 | sym::type_alias_impl_trait, | |
e1599b0c | 677 | ]; |
1b1a35ee XL |
678 | |
679 | /// Some features are not allowed to be used together at the same time, if | |
680 | /// the two are present, produce an error. | |
5869c6ff XL |
681 | /// |
682 | /// Currently empty, but we will probably need this again in the future, | |
683 | /// so let's keep it in for now. | |
684 | pub const INCOMPATIBLE_FEATURES: &[(Symbol, Symbol)] = &[]; |