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Rollup merge of #90935 - jhpratt:alphabetize-features, r=joshtriplett

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Alphabetize language features

This should significantly reduce the frequency of merge conflicts.

r? ````@joshtriplett````

````@rustbot```` label: +A-contributor-roadblock +S-waiting-on-review
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Matthias Krüger 2021-11-16 23:58:25 +01:00 committed by GitHub
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486
compiler/rustc_feature/src/accepted.rs
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@ -34,6 +34,9 @@ declare_features! (
/// These are used to test this portion of the compiler,
/// they don't actually mean anything.
(accepted, test_accepted_feature, "1.0.0", None, None),
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// -------------------------------------------------------------------------
// feature-group-end: for testing purposes
@ -43,266 +46,269 @@ declare_features! (
// feature-group-start: accepted features
// -------------------------------------------------------------------------
/// Allows using associated `type`s in `trait`s.
(accepted, associated_types, "1.0.0", None, None),
/// Allows using assigning a default type to type parameters in algebraic data type definitions.
(accepted, default_type_params, "1.0.0", None, None),
// FIXME: explain `globs`.
(accepted, globs, "1.0.0", None, None),
/// Allows `macro_rules!` items.
(accepted, macro_rules, "1.0.0", None, None),
/// Allows use of `&foo[a..b]` as a slicing syntax.
(accepted, slicing_syntax, "1.0.0", None, None),
/// Allows struct variants `Foo { baz: u8, .. }` in enums (RFC 418).
(accepted, struct_variant, "1.0.0", None, None),
/// Allows indexing tuples.
(accepted, tuple_indexing, "1.0.0", None, None),
/// Allows the use of `if let` expressions.
(accepted, if_let, "1.0.0", None, None),
/// Allows the use of `while let` expressions.
(accepted, while_let, "1.0.0", None, None),
/// Allows using `#![no_std]`.
(accepted, no_std, "1.6.0", None, None),
/// Allows overloading augmented assignment operations like `a += b`.
(accepted, augmented_assignments, "1.8.0", Some(28235), None),
/// Allows empty structs and enum variants with braces.
(accepted, braced_empty_structs, "1.8.0", Some(29720), None),
/// Allows `#[deprecated]` attribute.
(accepted, deprecated, "1.9.0", Some(29935), None),
/// Allows macros to appear in the type position.
(accepted, type_macros, "1.13.0", Some(27245), None),
/// Allows use of the postfix `?` operator in expressions.
(accepted, question_mark, "1.13.0", Some(31436), None),
/// Allows `..` in tuple (struct) patterns.
(accepted, dotdot_in_tuple_patterns, "1.14.0", Some(33627), None),
/// Allows some increased flexibility in the name resolution rules,
/// especially around globs and shadowing (RFC 1560).
(accepted, item_like_imports, "1.15.0", Some(35120), None),
/// Allows using `Self` and associated types in struct expressions and patterns.
(accepted, more_struct_aliases, "1.16.0", Some(37544), None),
/// Allows elision of `'static` lifetimes in `static`s and `const`s.
(accepted, static_in_const, "1.17.0", Some(35897), None),
/// Allows field shorthands (`x` meaning `x: x`) in struct literal expressions.
(accepted, field_init_shorthand, "1.17.0", Some(37340), None),
/// Allows the definition recursive static items.
(accepted, static_recursion, "1.17.0", Some(29719), None),
/// Allows `pub(restricted)` visibilities (RFC 1422).
(accepted, pub_restricted, "1.18.0", Some(32409), None),
/// Allows `#![windows_subsystem]`.
(accepted, windows_subsystem, "1.18.0", Some(37499), None),
/// Allows `break {expr}` with a value inside `loop`s.
(accepted, loop_break_value, "1.19.0", Some(37339), None),
/// Allows numeric fields in struct expressions and patterns.
(accepted, relaxed_adts, "1.19.0", Some(35626), None),
/// Allows coercing non capturing closures to function pointers.
(accepted, closure_to_fn_coercion, "1.19.0", Some(39817), None),
/// Allows attributes on struct literal fields.
(accepted, struct_field_attributes, "1.20.0", Some(38814), None),
/// Allows the definition of associated constants in `trait` or `impl` blocks.
(accepted, associated_consts, "1.20.0", Some(29646), None),
/// Allows usage of the `compile_error!` macro.
(accepted, compile_error, "1.20.0", Some(40872), None),
/// Allows code like `let x: &'static u32 = &42` to work (RFC 1414).
(accepted, rvalue_static_promotion, "1.21.0", Some(38865), None),
/// Allows `Drop` types in constants (RFC 1440).
(accepted, drop_types_in_const, "1.22.0", Some(33156), None),
/// Allows the sysV64 ABI to be specified on all platforms
/// instead of just the platforms on which it is the C ABI.
(accepted, abi_sysv64, "1.24.0", Some(36167), None),
/// Allows `repr(align(16))` struct attribute (RFC 1358).
(accepted, repr_align, "1.25.0", Some(33626), None),
/// Allows '|' at beginning of match arms (RFC 1925).
(accepted, match_beginning_vert, "1.25.0", Some(44101), None),
/// Allows nested groups in `use` items (RFC 2128).
(accepted, use_nested_groups, "1.25.0", Some(44494), None),
/// Allows indexing into constant arrays.
(accepted, const_indexing, "1.26.0", Some(29947), None),
/// Allows using `a..=b` and `..=b` as inclusive range syntaxes.
(accepted, inclusive_range_syntax, "1.26.0", Some(28237), None),
/// Allows `..=` in patterns (RFC 1192).
(accepted, dotdoteq_in_patterns, "1.26.0", Some(28237), None),
/// Allows `fn main()` with return types which implements `Termination` (RFC 1937).
(accepted, termination_trait, "1.26.0", Some(43301), None),
/// Allows implementing `Clone` for closures where possible (RFC 2132).
(accepted, clone_closures, "1.26.0", Some(44490), None),
/// Allows implementing `Copy` for closures where possible (RFC 2132).
(accepted, copy_closures, "1.26.0", Some(44490), None),
/// Allows `impl Trait` in function arguments.
(accepted, universal_impl_trait, "1.26.0", Some(34511), None),
/// Allows `impl Trait` in function return types.
(accepted, conservative_impl_trait, "1.26.0", Some(34511), None),
/// Allows using the `u128` and `i128` types.
(accepted, i128_type, "1.26.0", Some(35118), None),
/// Allows default match binding modes (RFC 2005).
(accepted, match_default_bindings, "1.26.0", Some(42640), None),
/// Allows `'_` placeholder lifetimes.
(accepted, underscore_lifetimes, "1.26.0", Some(44524), None),
/// Allows attributes on lifetime/type formal parameters in generics (RFC 1327).
(accepted, generic_param_attrs, "1.27.0", Some(48848), None),
/// Allows `cfg(target_feature = "...")`.
(accepted, cfg_target_feature, "1.27.0", Some(29717), None),
/// Allows `#[target_feature(...)]`.
(accepted, target_feature, "1.27.0", None, None),
/// Allows using `dyn Trait` as a syntax for trait objects.
(accepted, dyn_trait, "1.27.0", Some(44662), None),
/// Allows `#[must_use]` on functions, and introduces must-use operators (RFC 1940).
(accepted, fn_must_use, "1.27.0", Some(43302), None),
/// Allows use of the `:lifetime` macro fragment specifier.
(accepted, macro_lifetime_matcher, "1.27.0", Some(34303), None),
/// Allows `#[test]` functions where the return type implements `Termination` (RFC 1937).
(accepted, termination_trait_test, "1.27.0", Some(48854), None),
/// Allows the `#[global_allocator]` attribute.
(accepted, global_allocator, "1.28.0", Some(27389), None),
/// Allows `#[repr(transparent)]` attribute on newtype structs.
(accepted, repr_transparent, "1.28.0", Some(43036), None),
/// Allows procedural macros in `proc-macro` crates.
(accepted, proc_macro, "1.29.0", Some(38356), None),
/// Allows `foo.rs` as an alternative to `foo/mod.rs`.
(accepted, non_modrs_mods, "1.30.0", Some(44660), None),
/// Allows use of the `:vis` macro fragment specifier
(accepted, macro_vis_matcher, "1.30.0", Some(41022), None),
/// Allows importing and reexporting macros with `use`,
/// enables macro modularization in general.
(accepted, use_extern_macros, "1.30.0", Some(35896), None),
/// Allows keywords to be escaped for use as identifiers.
(accepted, raw_identifiers, "1.30.0", Some(48589), None),
/// Allows attributes scoped to tools.
(accepted, tool_attributes, "1.30.0", Some(44690), None),
/// Allows multi-segment paths in attributes and derives.
(accepted, proc_macro_path_invoc, "1.30.0", Some(38356), None),
/// Allows all literals in attribute lists and values of key-value pairs.
(accepted, attr_literals, "1.30.0", Some(34981), None),
/// Allows inferring outlives requirements (RFC 2093).
(accepted, infer_outlives_requirements, "1.30.0", Some(44493), None),
/// Allows annotating functions conforming to `fn(&PanicInfo) -> !` with `#[panic_handler]`.
/// This defines the behavior of panics.
(accepted, panic_handler, "1.30.0", Some(44489), None),
/// Allows `#[used]` to preserve symbols (see llvm.compiler.used).
(accepted, used, "1.30.0", Some(40289), None),
/// Allows `crate` in paths.
(accepted, crate_in_paths, "1.30.0", Some(45477), None),
/// Allows resolving absolute paths as paths from other crates.
(accepted, extern_absolute_paths, "1.30.0", Some(44660), None),
/// Allows access to crate names passed via `--extern` through prelude.
(accepted, extern_prelude, "1.30.0", Some(44660), None),
/// Allows parentheses in patterns.
(accepted, pattern_parentheses, "1.31.0", Some(51087), None),
/// Allows the definition of `const fn` functions.
(accepted, min_const_fn, "1.31.0", Some(53555), None),
/// Allows scoped lints.
(accepted, tool_lints, "1.31.0", Some(44690), None),
/// Allows lifetime elision in `impl` headers. For example:
/// + `impl<I:Iterator> Iterator for &mut Iterator`
/// + `impl Debug for Foo<'_>`
(accepted, impl_header_lifetime_elision, "1.31.0", Some(15872), None),
/// Allows `extern crate foo as bar;`. This puts `bar` into extern prelude.
(accepted, extern_crate_item_prelude, "1.31.0", Some(55599), None),
/// Allows use of the `:literal` macro fragment specifier (RFC 1576).
(accepted, macro_literal_matcher, "1.32.0", Some(35625), None),
/// Allows use of `?` as the Kleene "at most one" operator in macros.
(accepted, macro_at_most_once_rep, "1.32.0", Some(48075), None),
/// Allows `Self` struct constructor (RFC 2302).
(accepted, self_struct_ctor, "1.32.0", Some(51994), None),
/// Allows `Self` in type definitions (RFC 2300).
(accepted, self_in_typedefs, "1.32.0", Some(49303), None),
/// Allows `use x::y;` to search `x` in the current scope.
(accepted, uniform_paths, "1.32.0", Some(53130), None),
/// Allows integer match exhaustiveness checking (RFC 2591).
(accepted, exhaustive_integer_patterns, "1.33.0", Some(50907), None),
/// Allows `use path as _;` and `extern crate c as _;`.
(accepted, underscore_imports, "1.33.0", Some(48216), None),
/// Allows `#[repr(packed(N))]` attribute on structs.
(accepted, repr_packed, "1.33.0", Some(33158), None),
/// Allows irrefutable patterns in `if let` and `while let` statements (RFC 2086).
(accepted, irrefutable_let_patterns, "1.33.0", Some(44495), None),
/// Allows calling `const unsafe fn` inside `unsafe` blocks in `const fn` functions.
(accepted, min_const_unsafe_fn, "1.33.0", Some(55607), None),
/// Allows let bindings, assignments and destructuring in `const` functions and constants.
/// As long as control flow is not implemented in const eval, `&&` and `||` may not be used
/// at the same time as let bindings.
(accepted, const_let, "1.33.0", Some(48821), None),
/// Allows `#[cfg_attr(predicate, multiple, attributes, here)]`.
(accepted, cfg_attr_multi, "1.33.0", Some(54881), None),
/// Allows top level or-patterns (`p | q`) in `if let` and `while let`.
(accepted, if_while_or_patterns, "1.33.0", Some(48215), None),
/// Allows `cfg(target_vendor = "...")`.
(accepted, cfg_target_vendor, "1.33.0", Some(29718), None),
/// Allows `extern crate self as foo;`.
/// This puts local crate root into extern prelude under name `foo`.
(accepted, extern_crate_self, "1.34.0", Some(56409), None),
/// Allows arbitrary delimited token streams in non-macro attributes.
(accepted, unrestricted_attribute_tokens, "1.34.0", Some(55208), None),
/// Allows paths to enum variants on type aliases including `Self`.
(accepted, type_alias_enum_variants, "1.37.0", Some(49683), None),
/// Allows using `#[repr(align(X))]` on enums with equivalent semantics
/// to wrapping an enum in a wrapper struct with `#[repr(align(X))]`.
(accepted, repr_align_enum, "1.37.0", Some(57996), None),
/// Allows `const _: TYPE = VALUE`.
(accepted, underscore_const_names, "1.37.0", Some(54912), None),
/// Allows the definition of associated constants in `trait` or `impl` blocks.
(accepted, associated_consts, "1.20.0", Some(29646), None),
/// Allows using associated `type`s in `trait`s.
(accepted, associated_types, "1.0.0", None, None),
/// Allows free and inherent `async fn`s, `async` blocks, and `<expr>.await` expressions.
(accepted, async_await, "1.39.0", Some(50547), None),
/// Allows all literals in attribute lists and values of key-value pairs.
(accepted, attr_literals, "1.30.0", Some(34981), None),
/// Allows overloading augmented assignment operations like `a += b`.
(accepted, augmented_assignments, "1.8.0", Some(28235), None),
/// Allows mixing bind-by-move in patterns and references to those identifiers in guards.
(accepted, bind_by_move_pattern_guards, "1.39.0", Some(15287), None),
/// Allows attributes in formal function parameters.
(accepted, param_attrs, "1.39.0", Some(60406), None),
/// Allows macro invocations in `extern {}` blocks.
(accepted, macros_in_extern, "1.40.0", Some(49476), None),
/// Allows future-proofing enums/structs with the `#[non_exhaustive]` attribute (RFC 2008).
(accepted, non_exhaustive, "1.40.0", Some(44109), None),
/// Allows calling constructor functions in `const fn`.
(accepted, const_constructor, "1.40.0", Some(61456), None),
/// Allows the use of `#[cfg(doctest)]`, set when rustdoc is collecting doctests.
(accepted, cfg_doctest, "1.40.0", Some(62210), None),
/// Allows relaxing the coherence rules such that
/// `impl<T> ForeignTrait<LocalType> for ForeignType<T>` is permitted.
(accepted, re_rebalance_coherence, "1.41.0", Some(55437), None),
/// Allows #[repr(transparent)] on univariant enums (RFC 2645).
(accepted, transparent_enums, "1.42.0", Some(60405), None),
/// Allows using subslice patterns, `[a, .., b]` and `[a, xs @ .., b]`.
(accepted, slice_patterns, "1.42.0", Some(62254), None),
/// Allows the use of `if` and `match` in constants.
(accepted, const_if_match, "1.46.0", Some(49146), None),
/// Allows the use of `loop` and `while` in constants.
(accepted, const_loop, "1.46.0", Some(52000), None),
/// Allows `#[track_caller]` to be used which provides
/// accurate caller location reporting during panic (RFC 2091).
(accepted, track_caller, "1.46.0", Some(47809), None),
/// Allows `#[doc(alias = "...")]`.
(accepted, doc_alias, "1.48.0", Some(50146), None),
/// Allows patterns with concurrent by-move and by-ref bindings.
/// For example, you can write `Foo(a, ref b)` where `a` is by-move and `b` is by-ref.
(accepted, move_ref_pattern, "1.49.0", Some(68354), None),
/// The smallest useful subset of const generics.
(accepted, min_const_generics, "1.51.0", Some(74878), None),
/// The `unsafe_op_in_unsafe_fn` lint (allowed by default): no longer treat an unsafe function as an unsafe block.
(accepted, unsafe_block_in_unsafe_fn, "1.52.0", Some(71668), None),
/// Allows the use of or-patterns (e.g., `0 | 1`).
(accepted, or_patterns, "1.53.0", Some(54883), None),
/// Allows defining identifiers beyond ASCII.
(accepted, non_ascii_idents, "1.53.0", Some(55467), None),
/// Allows arbitrary expressions in key-value attributes at parse time.
(accepted, extended_key_value_attributes, "1.54.0", Some(78835), None),
/// Allows unsizing coercions in `const fn`.
(accepted, const_fn_unsize, "1.54.0", Some(64992), None),
/// Allows `impl Trait` with multiple unrelated lifetimes.
(accepted, member_constraints, "1.54.0", Some(61997), None),
/// Allows bindings in the subpattern of a binding pattern.
/// For example, you can write `x @ Some(y)`.
(accepted, bindings_after_at, "1.56.0", Some(65490), None),
/// Allows empty structs and enum variants with braces.
(accepted, braced_empty_structs, "1.8.0", Some(29720), None),
/// Allows `#[cfg_attr(predicate, multiple, attributes, here)]`.
(accepted, cfg_attr_multi, "1.33.0", Some(54881), None),
/// Allows the use of `#[cfg(doctest)]`, set when rustdoc is collecting doctests.
(accepted, cfg_doctest, "1.40.0", Some(62210), None),
/// Allows `cfg(target_feature = "...")`.
(accepted, cfg_target_feature, "1.27.0", Some(29717), None),
/// Allows `cfg(target_vendor = "...")`.
(accepted, cfg_target_vendor, "1.33.0", Some(29718), None),
/// Allows implementing `Clone` for closures where possible (RFC 2132).
(accepted, clone_closures, "1.26.0", Some(44490), None),
/// Allows coercing non capturing closures to function pointers.
(accepted, closure_to_fn_coercion, "1.19.0", Some(39817), None),
/// Allows usage of the `compile_error!` macro.
(accepted, compile_error, "1.20.0", Some(40872), None),
/// Allows `impl Trait` in function return types.
(accepted, conservative_impl_trait, "1.26.0", Some(34511), None),
/// Allows calling constructor functions in `const fn`.
(accepted, const_constructor, "1.40.0", Some(61456), None),
/// Allows calling `transmute` in const fn
(accepted, const_fn_transmute, "1.56.0", Some(53605), None),
/// Allows accessing fields of unions inside `const` functions.
(accepted, const_fn_union, "1.56.0", Some(51909), None),
/// Allows macro attributes to observe output of `#[derive]`.
(accepted, macro_attributes_in_derive_output, "1.57.0", Some(81119), None),
/// Allows unsizing coercions in `const fn`.
(accepted, const_fn_unsize, "1.54.0", Some(64992), None),
/// Allows the use of `if` and `match` in constants.
(accepted, const_if_match, "1.46.0", Some(49146), None),
/// Allows indexing into constant arrays.
(accepted, const_indexing, "1.26.0", Some(29947), None),
/// Allows let bindings, assignments and destructuring in `const` functions and constants.
/// As long as control flow is not implemented in const eval, `&&` and `||` may not be used
/// at the same time as let bindings.
(accepted, const_let, "1.33.0", Some(48821), None),
/// Allows the use of `loop` and `while` in constants.
(accepted, const_loop, "1.46.0", Some(52000), None),
/// Allows panicking during const eval (producing compile-time errors).
(accepted, const_panic, "1.57.0", Some(51999), None),
/// Lessens the requirements for structs to implement `Unsize`.
(accepted, relaxed_struct_unsize, "1.58.0", Some(81793), None),
/// Allows dereferencing raw pointers during const eval.
(accepted, const_raw_ptr_deref, "1.58.0", Some(51911), None),
/// Allows implementing `Copy` for closures where possible (RFC 2132).
(accepted, copy_closures, "1.26.0", Some(44490), None),
/// Allows `crate` in paths.
(accepted, crate_in_paths, "1.30.0", Some(45477), None),
/// Allows using assigning a default type to type parameters in algebraic data type definitions.
(accepted, default_type_params, "1.0.0", None, None),
/// Allows `#[deprecated]` attribute.
(accepted, deprecated, "1.9.0", Some(29935), None),
/// Allows `#[doc(alias = "...")]`.
(accepted, doc_alias, "1.48.0", Some(50146), None),
/// Allows `..` in tuple (struct) patterns.
(accepted, dotdot_in_tuple_patterns, "1.14.0", Some(33627), None),
/// Allows `..=` in patterns (RFC 1192).
(accepted, dotdoteq_in_patterns, "1.26.0", Some(28237), None),
/// Allows `Drop` types in constants (RFC 1440).
(accepted, drop_types_in_const, "1.22.0", Some(33156), None),
/// Allows using `dyn Trait` as a syntax for trait objects.
(accepted, dyn_trait, "1.27.0", Some(44662), None),
/// Allows integer match exhaustiveness checking (RFC 2591).
(accepted, exhaustive_integer_patterns, "1.33.0", Some(50907), None),
/// Allows arbitrary expressions in key-value attributes at parse time.
(accepted, extended_key_value_attributes, "1.54.0", Some(78835), None),
/// Allows resolving absolute paths as paths from other crates.
(accepted, extern_absolute_paths, "1.30.0", Some(44660), None),
/// Allows `extern crate foo as bar;`. This puts `bar` into extern prelude.
(accepted, extern_crate_item_prelude, "1.31.0", Some(55599), None),
/// Allows `extern crate self as foo;`.
/// This puts local crate root into extern prelude under name `foo`.
(accepted, extern_crate_self, "1.34.0", Some(56409), None),
/// Allows access to crate names passed via `--extern` through prelude.
(accepted, extern_prelude, "1.30.0", Some(44660), None),
/// Allows field shorthands (`x` meaning `x: x`) in struct literal expressions.
(accepted, field_init_shorthand, "1.17.0", Some(37340), None),
/// Allows `#[must_use]` on functions, and introduces must-use operators (RFC 1940).
(accepted, fn_must_use, "1.27.0", Some(43302), None),
/// Allows capturing variables in scope using format_args!
(accepted, format_args_capture, "1.58.0", Some(67984), None),
/// Allows attributes on lifetime/type formal parameters in generics (RFC 1327).
(accepted, generic_param_attrs, "1.27.0", Some(48848), None),
/// Allows the `#[global_allocator]` attribute.
(accepted, global_allocator, "1.28.0", Some(27389), None),
// FIXME: explain `globs`.
(accepted, globs, "1.0.0", None, None),
/// Allows using the `u128` and `i128` types.
(accepted, i128_type, "1.26.0", Some(35118), None),
/// Allows the use of `if let` expressions.
(accepted, if_let, "1.0.0", None, None),
/// Allows top level or-patterns (`p | q`) in `if let` and `while let`.
(accepted, if_while_or_patterns, "1.33.0", Some(48215), None),
/// Allows lifetime elision in `impl` headers. For example:
/// + `impl<I:Iterator> Iterator for &mut Iterator`
/// + `impl Debug for Foo<'_>`
(accepted, impl_header_lifetime_elision, "1.31.0", Some(15872), None),
/// Allows using `a..=b` and `..=b` as inclusive range syntaxes.
(accepted, inclusive_range_syntax, "1.26.0", Some(28237), None),
/// Allows inferring outlives requirements (RFC 2093).
(accepted, infer_outlives_requirements, "1.30.0", Some(44493), None),
/// Allows irrefutable patterns in `if let` and `while let` statements (RFC 2086).
(accepted, irrefutable_let_patterns, "1.33.0", Some(44495), None),
/// Allows some increased flexibility in the name resolution rules,
/// especially around globs and shadowing (RFC 1560).
(accepted, item_like_imports, "1.15.0", Some(35120), None),
/// Allows `break {expr}` with a value inside `loop`s.
(accepted, loop_break_value, "1.19.0", Some(37339), None),
/// Allows use of `?` as the Kleene "at most one" operator in macros.
(accepted, macro_at_most_once_rep, "1.32.0", Some(48075), None),
/// Allows macro attributes to observe output of `#[derive]`.
(accepted, macro_attributes_in_derive_output, "1.57.0", Some(81119), None),
/// Allows use of the `:lifetime` macro fragment specifier.
(accepted, macro_lifetime_matcher, "1.27.0", Some(34303), None),
/// Allows use of the `:literal` macro fragment specifier (RFC 1576).
(accepted, macro_literal_matcher, "1.32.0", Some(35625), None),
/// Allows `macro_rules!` items.
(accepted, macro_rules, "1.0.0", None, None),
/// Allows use of the `:vis` macro fragment specifier
(accepted, macro_vis_matcher, "1.30.0", Some(41022), None),
/// Allows macro invocations in `extern {}` blocks.
(accepted, macros_in_extern, "1.40.0", Some(49476), None),
/// Allows '|' at beginning of match arms (RFC 1925).
(accepted, match_beginning_vert, "1.25.0", Some(44101), None),
/// Allows default match binding modes (RFC 2005).
(accepted, match_default_bindings, "1.26.0", Some(42640), None),
/// Allows `impl Trait` with multiple unrelated lifetimes.
(accepted, member_constraints, "1.54.0", Some(61997), None),
/// Allows the definition of `const fn` functions.
(accepted, min_const_fn, "1.31.0", Some(53555), None),
/// The smallest useful subset of const generics.
(accepted, min_const_generics, "1.51.0", Some(74878), None),
/// Allows calling `const unsafe fn` inside `unsafe` blocks in `const fn` functions.
(accepted, min_const_unsafe_fn, "1.33.0", Some(55607), None),
/// Allows using `Self` and associated types in struct expressions and patterns.
(accepted, more_struct_aliases, "1.16.0", Some(37544), None),
/// Allows patterns with concurrent by-move and by-ref bindings.
/// For example, you can write `Foo(a, ref b)` where `a` is by-move and `b` is by-ref.
(accepted, move_ref_pattern, "1.49.0", Some(68354), None),
/// Allows using `#![no_std]`.
(accepted, no_std, "1.6.0", None, None),
/// Allows defining identifiers beyond ASCII.
(accepted, non_ascii_idents, "1.53.0", Some(55467), None),
/// Allows future-proofing enums/structs with the `#[non_exhaustive]` attribute (RFC 2008).
(accepted, non_exhaustive, "1.40.0", Some(44109), None),
/// Allows `foo.rs` as an alternative to `foo/mod.rs`.
(accepted, non_modrs_mods, "1.30.0", Some(44660), None),
/// Allows the use of or-patterns (e.g., `0 | 1`).
(accepted, or_patterns, "1.53.0", Some(54883), None),
/// Allows annotating functions conforming to `fn(&PanicInfo) -> !` with `#[panic_handler]`.
/// This defines the behavior of panics.
(accepted, panic_handler, "1.30.0", Some(44489), None),
/// Allows attributes in formal function parameters.
(accepted, param_attrs, "1.39.0", Some(60406), None),
/// Allows parentheses in patterns.
(accepted, pattern_parentheses, "1.31.0", Some(51087), None),
/// Allows procedural macros in `proc-macro` crates.
(accepted, proc_macro, "1.29.0", Some(38356), None),
/// Allows multi-segment paths in attributes and derives.
(accepted, proc_macro_path_invoc, "1.30.0", Some(38356), None),
/// Allows `pub(restricted)` visibilities (RFC 1422).
(accepted, pub_restricted, "1.18.0", Some(32409), None),
/// Allows use of the postfix `?` operator in expressions.
(accepted, question_mark, "1.13.0", Some(31436), None),
/// Allows keywords to be escaped for use as identifiers.
(accepted, raw_identifiers, "1.30.0", Some(48589), None),
/// Allows relaxing the coherence rules such that
/// `impl<T> ForeignTrait<LocalType> for ForeignType<T>` is permitted.
(accepted, re_rebalance_coherence, "1.41.0", Some(55437), None),
/// Allows numeric fields in struct expressions and patterns.
(accepted, relaxed_adts, "1.19.0", Some(35626), None),
/// Lessens the requirements for structs to implement `Unsize`.
(accepted, relaxed_struct_unsize, "1.58.0", Some(81793), None),
/// Allows `repr(align(16))` struct attribute (RFC 1358).
(accepted, repr_align, "1.25.0", Some(33626), None),
/// Allows using `#[repr(align(X))]` on enums with equivalent semantics
/// to wrapping an enum in a wrapper struct with `#[repr(align(X))]`.
(accepted, repr_align_enum, "1.37.0", Some(57996), None),
/// Allows `#[repr(packed(N))]` attribute on structs.
(accepted, repr_packed, "1.33.0", Some(33158), None),
/// Allows `#[repr(transparent)]` attribute on newtype structs.
(accepted, repr_transparent, "1.28.0", Some(43036), None),
/// Allows code like `let x: &'static u32 = &42` to work (RFC 1414).
(accepted, rvalue_static_promotion, "1.21.0", Some(38865), None),
/// Allows `Self` in type definitions (RFC 2300).
(accepted, self_in_typedefs, "1.32.0", Some(49303), None),
/// Allows `Self` struct constructor (RFC 2302).
(accepted, self_struct_ctor, "1.32.0", Some(51994), None),
/// Allows using subslice patterns, `[a, .., b]` and `[a, xs @ .., b]`.
(accepted, slice_patterns, "1.42.0", Some(62254), None),
/// Allows use of `&foo[a..b]` as a slicing syntax.
(accepted, slicing_syntax, "1.0.0", None, None),
/// Allows elision of `'static` lifetimes in `static`s and `const`s.
(accepted, static_in_const, "1.17.0", Some(35897), None),
/// Allows the definition recursive static items.
(accepted, static_recursion, "1.17.0", Some(29719), None),
/// Allows attributes on struct literal fields.
(accepted, struct_field_attributes, "1.20.0", Some(38814), None),
/// Allows struct variants `Foo { baz: u8, .. }` in enums (RFC 418).
(accepted, struct_variant, "1.0.0", None, None),
/// Allows `#[target_feature(...)]`.
(accepted, target_feature, "1.27.0", None, None),
/// Allows `fn main()` with return types which implements `Termination` (RFC 1937).
(accepted, termination_trait, "1.26.0", Some(43301), None),
/// Allows `#[test]` functions where the return type implements `Termination` (RFC 1937).
(accepted, termination_trait_test, "1.27.0", Some(48854), None),
/// Allows attributes scoped to tools.
(accepted, tool_attributes, "1.30.0", Some(44690), None),
/// Allows scoped lints.
(accepted, tool_lints, "1.31.0", Some(44690), None),
/// Allows `#[track_caller]` to be used which provides
/// accurate caller location reporting during panic (RFC 2091).
(accepted, track_caller, "1.46.0", Some(47809), None),
/// Allows #[repr(transparent)] on univariant enums (RFC 2645).
(accepted, transparent_enums, "1.42.0", Some(60405), None),
/// Allows indexing tuples.
(accepted, tuple_indexing, "1.0.0", None, None),
/// Allows paths to enum variants on type aliases including `Self`.
(accepted, type_alias_enum_variants, "1.37.0", Some(49683), None),
/// Allows macros to appear in the type position.
(accepted, type_macros, "1.13.0", Some(27245), None),
/// Allows `const _: TYPE = VALUE`.
(accepted, underscore_const_names, "1.37.0", Some(54912), None),
/// Allows `use path as _;` and `extern crate c as _;`.
(accepted, underscore_imports, "1.33.0", Some(48216), None),
/// Allows `'_` placeholder lifetimes.
(accepted, underscore_lifetimes, "1.26.0", Some(44524), None),
/// Allows `use x::y;` to search `x` in the current scope.
(accepted, uniform_paths, "1.32.0", Some(53130), None),
/// Allows `impl Trait` in function arguments.
(accepted, universal_impl_trait, "1.26.0", Some(34511), None),
/// Allows arbitrary delimited token streams in non-macro attributes.
(accepted, unrestricted_attribute_tokens, "1.34.0", Some(55208), None),
/// The `unsafe_op_in_unsafe_fn` lint (allowed by default): no longer treat an unsafe function as an unsafe block.
(accepted, unsafe_block_in_unsafe_fn, "1.52.0", Some(71668), None),
/// Allows importing and reexporting macros with `use`,
/// enables macro modularization in general.
(accepted, use_extern_macros, "1.30.0", Some(35896), None),
/// Allows nested groups in `use` items (RFC 2128).
(accepted, use_nested_groups, "1.25.0", Some(44494), None),
/// Allows `#[used]` to preserve symbols (see llvm.compiler.used).
(accepted, used, "1.30.0", Some(40289), None),
/// Allows the use of `while let` expressions.
(accepted, while_let, "1.0.0", None, None),
/// Allows `#![windows_subsystem]`.
(accepted, windows_subsystem, "1.18.0", Some(37499), None),
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// -------------------------------------------------------------------------
// feature-group-end: accepted features

853
compiler/rustc_feature/src/active.rs
View file

@ -122,130 +122,101 @@ impl Feature {
#[rustfmt::skip]
declare_features! (
// -------------------------------------------------------------------------
// feature-group-start: internal feature gates
// feature-group-start: internal feature gates (no tracking issue)
// -------------------------------------------------------------------------
// no-tracking-issue-start
/// Allows using `rustc_*` attributes (RFC 572).
(active, rustc_attrs, "1.0.0", None, None),
/// Allows using compiler's own crates.
(active, rustc_private, "1.0.0", Some(27812), None),
/// Allows using the `rust-intrinsic`'s "ABI".
(active, intrinsics, "1.0.0", None, None),
/// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic.
(active, lang_items, "1.0.0", None, None),
/// Allows using the `#[stable]` and `#[unstable]` attributes.
(active, staged_api, "1.0.0", None, None),
/// Allows using `#[allow_internal_unstable]`. This is an
/// attribute on `macro_rules!` and can't use the attribute handling
/// below (it has to be checked before expansion possibly makes
/// macros disappear).
(active, allow_internal_unstable, "1.0.0", None, None),
/// Allows using 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),
/// no-tracking-issue-end
/// Allows using `#[link_name="llvm.*"]`.
(active, link_llvm_intrinsics, "1.0.0", Some(29602), None),
/// Allows using the `box $expr` syntax.
(active, box_syntax, "1.0.0", Some(49733), None),
/// Allows using `#[start]` on a function indicating that it is the program entrypoint.
(active, start, "1.0.0", Some(29633), None),
/// Allows using the `#[fundamental]` attribute.
(active, fundamental, "1.0.0", Some(29635), None),
/// Allows using the `rust-call` ABI.
(active, unboxed_closures, "1.0.0", Some(29625), None),
/// Allows using the `#[linkage = ".."]` attribute.
(active, linkage, "1.0.0", Some(29603), None),
/// Allows using `box` in patterns (RFC 469).
(active, box_patterns, "1.0.0", Some(29641), None),
// no-tracking-issue-start
/// Allows using `#[prelude_import]` on glob `use` items.
(active, prelude_import, "1.2.0", None, None),
// no-tracking-issue-end
// no-tracking-issue-start
/// Allows using `#[omit_gdb_pretty_printer_section]`.
(active, omit_gdb_pretty_printer_section, "1.5.0", None, None),
/// Allows using the `vectorcall` ABI.
(active, abi_vectorcall, "1.7.0", None, None),
// no-tracking-issue-end
/// Allows using `#[structural_match]` which indicates that a type is structurally matchable.
/// 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 `may_dangle` attribute (RFC 1327).
(active, dropck_eyepatch, "1.10.0", Some(34761), None),
/// Allows using the `#![panic_runtime]` attribute.
(active, panic_runtime, "1.10.0", Some(32837), None),
/// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed.
(active, needs_panic_runtime, "1.10.0", Some(32837), None),
// no-tracking-issue-start
/// Allows 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 identifying the `compiler_builtins` crate.
(active, compiler_builtins, "1.13.0", None, None),
/// Allows using the `unadjusted` ABI; perma-unstable.
(active, abi_unadjusted, "1.16.0", None, None),
/// Used to identify crates that contain the profiler runtime.
(active, profiler_runtime, "1.18.0", None, None),
/// Allows using the `thiscall` ABI.
(active, abi_thiscall, "1.19.0", None, None),
/// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`.
(active, allocator_internals, "1.20.0", None, None),
/// Added for testing E0705; perma-unstable.
(active, test_2018_feature, "1.31.0", None, Some(Edition::Edition2018)),
/// 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 `#[repr(no_niche)]` (an implementation detail of `rustc`,
/// it is not on path for eventual stabilization).
(active, no_niche, "1.42.0", 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)),
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
/// 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),
// 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),
// no-tracking-issue-end
/// 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 `#[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
@ -258,23 +229,26 @@ declare_features! (
// FIXME: Document these and merge with the list below.
// Unstable `#[target_feature]` directives.
(active, arm_target_feature, "1.27.0", Some(44839), None),
(active, aarch64_target_feature, "1.27.0", Some(44839), None),
(active, hexagon_target_feature, "1.27.0", Some(44839), None),
(active, powerpc_target_feature, "1.27.0", Some(44839), None),
(active, mips_target_feature, "1.27.0", Some(44839), None),
(active, adx_target_feature, "1.32.0", 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),
(active, adx_target_feature, "1.32.0", Some(44839), None),
(active, cmpxchg16b_target_feature, "1.32.0", Some(44839), None),
(active, movbe_target_feature, "1.34.0", Some(44839), None),
(active, rtm_target_feature, "1.35.0", Some(44839), None),
(active, f16c_target_feature, "1.36.0", Some(44839), None),
(active, riscv_target_feature, "1.45.0", Some(44839), None),
(active, ermsb_target_feature, "1.49.0", Some(44839), None),
(active, bpf_target_feature, "1.54.0", 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)
@ -284,65 +258,275 @@ declare_features! (
// feature-group-start: actual feature gates
// -------------------------------------------------------------------------
/// Allows using `#![plugin(myplugin)]`.
(active, plugin, "1.0.0", Some(29597), None),
/// Allows using `#[thread_local]` on `static` items.
(active, thread_local, "1.0.0", Some(29594), None),
/// Allows the use of SIMD types in functions declared in `extern` blocks.
(active, simd_ffi, "1.0.0", Some(27731), None),
/// Allows using non lexical lifetimes (RFC 2094).
(active, nll, "1.0.0", Some(43234), None),
/// Allows using 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(44580), None),
/// Allows defining an `#[alloc_error_handler]`.
(active, alloc_error_handler, "1.29.0", Some(51540), None),
/// Allows a test to fail without failing the whole suite.
(active, allow_fail, "1.19.0", Some(46488), None),
/// Allows explicit discriminants on non-unit enum variants.
(active, arbitrary_enum_discriminant, "1.37.0", Some(60553), 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(72016), None),
/// Enables experimental inline assembly support for additional architectures.
(active, asm_experimental_arch, "1.58.0", Some(72016), None),
/// Allows using `sym` operands in inline assembly.
(active, asm_sym, "1.58.0", Some(72016), 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 `#![no_core]`.
(active, no_core, "1.3.0", Some(29639), None),
/// Allows default type parameters to influence type inference.
(active, default_type_parameter_fallback, "1.3.0", Some(27336), None),
/// Allows `repr(simd)` and importing the various simd intrinsics.
(active, repr_simd, "1.4.0", Some(27731), None),
/// Allows `extern "platform-intrinsic" { ... }`.
(active, platform_intrinsics, "1.4.0", Some(27731), None),
/// Allows attributes on expressions and non-item statements.
(active, stmt_expr_attributes, "1.6.0", Some(15701), None),
/// Allows the use of type ascription in expressions.
(active, type_ascription, "1.6.0", Some(23416), None),
/// Allows `async || body` closures.
(active, async_closure, "1.37.0", Some(62290), 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),
/// Enables `#[cfg(panic = "...")]` config key.
(active, cfg_panic, "1.49.0", Some(77443), 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_has_atomic = "...")`.
(active, cfg_target_has_atomic, "1.9.0", Some(32976), None),
/// Allows `cfg(target_thread_local)`.
(active, cfg_target_thread_local, "1.7.0", Some(29594), None),
/// Allows specialization of implementations (RFC 1210).
(incomplete, specialization, "1.7.0", Some(31844), None),
/// Allow conditional compilation depending on rust version
(active, cfg_version, "1.45.0", Some(64796), 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 `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 using and casting function pointers in a `const fn`.
(active, const_fn_fn_ptr_basics, "1.48.0", Some(57563), None),
/// Allows trait bounds in `const fn`.
(active, const_fn_trait_bound, "1.53.0", Some(57563), None),
/// Allows `for _ in _` loops in const contexts.
(active, const_for, "1.56.0", Some(87575), None),
/// Allows const generics to have default values (e.g. `struct Foo<const N: usize = 3>(...);`).
(active, const_generics_defaults, "1.51.0", Some(44580), None),
/// Allows argument and return position `impl Trait` in a `const fn`.
(active, const_impl_trait, "1.48.0", Some(77463), 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 using `crate` as visibility modifier, synonymous with `pub(crate)`.
(active, crate_visibility_modifier, "1.23.0", Some(53120), 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 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 `#[derive(Default)]` and `#[default]` on enums.
(active, derive_default_enum, "1.56.0", Some(86985), None),
/// Allows the use of destructuring assignments.
(active, destructuring_assignment, "1.49.0", Some(71126), 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 using `#[doc(keyword = "...")]`.
(active, doc_keyword, "1.28.0", Some(51315), None),
/// Allows `#[doc(masked)]`.
(active, doc_masked, "1.21.0", Some(44027), None),
/// Allows using doc(primitive) without a future-incompat warning
(active, doc_primitive, "1.56.0", Some(88070), None),
/// Allows `X..Y` patterns.
(active, exclusive_range_pattern, "1.11.0", Some(37854), None),
/// Allows exhaustive pattern matching on types that contain uninhabited types.
(active, exhaustive_patterns, "1.13.0", Some(51085), None),
/// Allows explicit generic arguments specification with `impl Trait` present.
(active, explicit_generic_args_with_impl_trait, "1.56.0", Some(83701), None),
/// Allows defining `extern type`s.
(active, extern_types, "1.23.0", Some(43467), None),
/// Allows the use of `#[ffi_const]` on foreign functions.
(active, ffi_const, "1.45.0", Some(58328), None),
/// Allows the use of `#[ffi_pure]` on foreign functions.
(active, ffi_pure, "1.45.0", Some(58329), None),
/// Allows using `#[ffi_returns_twice]` on foreign functions.
(active, ffi_returns_twice, "1.34.0", Some(58314), None),
/// Allows using `#[repr(align(...))]` on function items
(active, fn_align, "1.53.0", Some(82232), None),
/// Allows defining generators.
(active, generators, "1.21.0", Some(43122), None),
/// Infer generic args for both consts and types.
(active, generic_arg_infer, "1.55.0", Some(85077), None),
/// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598).
(active, generic_associated_types, "1.23.0", Some(44265), None),
/// Allows non-trivial generic constants which have to have wfness manually propagated to callers
(incomplete, generic_const_exprs, "1.56.0", Some(76560), None),
/// Allows using `..X`, `..=X`, `...X`, and `X..` as a pattern.
(active, half_open_range_patterns, "1.41.0", Some(67264), None),
/// Allows `if let` guard in match arms.
(active, if_let_guard, "1.47.0", Some(51114), None),
/// Allows using imported `main` function
(active, imported_main, "1.53.0", Some(28937), None),
/// Allows in-band quantification of lifetime bindings (e.g., `fn foo(x: &'a u8) -> &'a u8`).
(active, in_band_lifetimes, "1.23.0", Some(44524), None),
/// Allows inferring `'static` outlives requirements (RFC 2093).
(active, infer_static_outlives_requirements, "1.26.0", Some(54185), None),
/// Allows associated types in inherent impls.
(incomplete, inherent_associated_types, "1.52.0", Some(8995), None),
/// Allow anonymous constants from an inline `const` block
(incomplete, inline_const, "1.49.0", Some(76001), None),
/// Allows using `pointer` and `reference` in intra-doc links
(active, intra_doc_pointers, "1.51.0", Some(80896), None),
/// Allows `#[instruction_set(_)]` attribute
(active, isa_attribute, "1.48.0", Some(74727), None),
/// Allows `'a: { break 'a; }`.
(active, label_break_value, "1.28.0", Some(48594), None),
// Allows setting the threshold for the `large_assignments` lint.
(active, large_assignments, "1.52.0", Some(83518), None),
/// Allows `if/while p && let q = r && ...` chains.
(incomplete, let_chains, "1.37.0", Some(53667), None),
/// Allows `let...else` statements.
(active, let_else, "1.56.0", Some(87335), None),
/// Allows `#[link(..., cfg(..))]`.
(active, link_cfg, "1.14.0", Some(37406), None),
/// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check.
(active, lint_reasons, "1.31.0", Some(54503), None),
/// 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 `cfg(target_has_atomic = "...")`.
(active, cfg_target_has_atomic, "1.9.0", Some(32976), None),
/// Allows `X..Y` patterns.
(active, exclusive_range_pattern, "1.11.0", Some(37854), None),
/// Allows specifying modifiers in the link attribute: `#[link(modifiers = "...")]`
(active, native_link_modifiers, "1.53.0", Some(81490), None),
/// Allows specifying the as-needed link modifier
(active, native_link_modifiers_as_needed, "1.53.0", Some(81490), None),
/// Allows specifying the bundle link modifier
(active, native_link_modifiers_bundle, "1.53.0", Some(81490), None),
/// Allows specifying the verbatim link modifier
(active, native_link_modifiers_verbatim, "1.53.0", Some(81490), None),
/// Allows specifying the whole-archive link modifier
(active, native_link_modifiers_whole_archive, "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 exhaustive pattern matching on types that contain uninhabited types.
(active, exhaustive_patterns, "1.13.0", Some(51085), None),
/// Allows diverging expressions to fall back to `!` rather than `()`.
(active, never_type_fallback, "1.41.0", Some(65992), None),
/// Allows using non lexical lifetimes (RFC 2094).
(active, nll, "1.0.0", Some(43234), None),
/// Allows `#![no_core]`.
(active, no_core, "1.3.0", Some(29639), None),
/// Allows function attribute `#[no_coverage]`, to bypass coverage
/// instrumentation of that function.
(active, no_coverage, "1.53.0", Some(84605), None),
/// Allows the use of `no_sanitize` attribute.
(active, no_sanitize, "1.42.0", Some(39699), None),
/// Allows using the `non_exhaustive_omitted_patterns` lint.
(active, non_exhaustive_omitted_patterns_lint, "1.57.0", Some(89554), None),
/// Allows making `dyn Trait` well-formed even if `Trait` is not object safe.
/// In that case, `dyn Trait: Trait` does not hold. Moreover, coercions and
/// casts in safe Rust to `dyn Trait` for such a `Trait` is also forbidden.
(active, object_safe_for_dispatch, "1.40.0", Some(43561), None),
/// Allows using `#[optimize(X)]`.
(active, optimize_attribute, "1.34.0", Some(54882), None),
/// Allows `extern "platform-intrinsic" { ... }`.
(active, platform_intrinsics, "1.4.0", Some(27731), None),
/// Allows using `#![plugin(myplugin)]`.
(active, plugin, "1.0.0", Some(29597), None),
/// Allows exhaustive integer pattern matching on `usize` and `isize`.
(active, precise_pointer_size_matching, "1.32.0", Some(56354), None),
/// Allows macro attributes on expressions, statements and non-inline modules.
(active, proc_macro_hygiene, "1.30.0", Some(54727), None),
/// Allows the use of raw-dylibs (RFC 2627).
(incomplete, raw_dylib, "1.40.0", Some(58713), None),
/// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.
(active, raw_ref_op, "1.41.0", Some(64490), None),
/// Allows using the `#[register_attr]` attribute.
(active, register_attr, "1.41.0", Some(66080), None),
/// Allows using the `#[register_tool]` attribute.
(active, register_tool, "1.41.0", Some(66079), None),
/// Allows the `#[repr(i128)]` attribute for enums.
(incomplete, repr128, "1.16.0", Some(56071), None),
/// Allows `repr(simd)` and importing the various simd intrinsics.
(active, repr_simd, "1.4.0", Some(27731), None),
/// Allows the use of SIMD types in functions declared in `extern` blocks.
(active, simd_ffi, "1.0.0", Some(27731), None),
/// Allows specialization of implementations (RFC 1210).
(incomplete, specialization, "1.7.0", Some(31844), None),
/// Allows `#[link(kind="static-nobundle"...)]`.
(active, static_nobundle, "1.16.0", Some(37403), None),
/// Allows attributes on expressions and non-item statements.
(active, stmt_expr_attributes, "1.6.0", Some(15701), None),
/// Allows the use of `#[target_feature]` on safe functions.
(active, target_feature_11, "1.45.0", Some(69098), None),
/// Allows using `#[thread_local]` on `static` items.
(active, thread_local, "1.0.0", Some(29594), None),
/// Allows defining `trait X = A + B;` alias items.
(active, trait_alias, "1.24.0", Some(41517), None),
/// Allows upcasting trait objects via supertraits.
/// Trait upcasting is casting, e.g., `dyn Foo -> dyn Bar` where `Foo: Bar`.
(incomplete, trait_upcasting, "1.56.0", Some(65991), None),
/// Allows #[repr(transparent)] on unions (RFC 2645).
(active, transparent_unions, "1.37.0", Some(60405), None),
/// Allows inconsistent bounds in where clauses.
(active, trivial_bounds, "1.28.0", Some(48214), None),
/// Allows using `try {...}` expressions.
(active, try_blocks, "1.29.0", Some(31436), None),
/// Allows `impl Trait` to be used inside type aliases (RFC 2515).
(active, type_alias_impl_trait, "1.38.0", Some(63063), None),
/// Allows the use of type ascription in expressions.
(active, type_ascription, "1.6.0", Some(23416), None),
/// Allows creation of instances of a struct by moving fields that have
/// not changed from prior instances of the same struct (RFC #2528)
(incomplete, type_changing_struct_update, "1.58.0", Some(86555), None),
/// Allows unsized fn parameters.
(active, unsized_fn_params, "1.49.0", Some(48055), None),
/// Allows unsized rvalues at arguments and parameters.
(incomplete, unsized_locals, "1.30.0", Some(48055), None),
/// Allows unsized tuple coercion.
(active, unsized_tuple_coercion, "1.20.0", Some(42877), None),
/// Allows `union`s to implement `Drop`. Moreover, `union`s may now include fields
/// that don't implement `Copy` as long as they don't have any drop glue.
/// This is checked recursively. On encountering type variable where no progress can be made,
@ -350,350 +534,11 @@ declare_features! (
///
/// NOTE: A limited form of `union U { ... }` was accepted in 1.19.0.
(active, untagged_unions, "1.13.0", Some(55149), None),
/// Allows `#[link(..., cfg(..))]`.
(active, link_cfg, "1.14.0", Some(37406), None),
/// Allows `extern "ptx-*" fn()`.
(active, abi_ptx, "1.15.0", Some(38788), None),
/// Allows the `#[repr(i128)]` attribute for enums.
(incomplete, repr128, "1.16.0", Some(56071), None),
/// Allows `#[link(kind="static-nobundle"...)]`.
(active, static_nobundle, "1.16.0", Some(37403), None),
/// Allows `extern "msp430-interrupt" fn()`.
(active, abi_msp430_interrupt, "1.16.0", Some(38487), None),
/// Allows declarative macros 2.0 (`macro`).
(active, decl_macro, "1.17.0", Some(39412), None),
/// Allows `extern "x86-interrupt" fn()`.
(active, abi_x86_interrupt, "1.17.0", Some(40180), None),
/// Allows a test to fail without failing the whole suite.
(active, allow_fail, "1.19.0", Some(46488), None),
/// Allows unsized tuple coercion.
(active, unsized_tuple_coercion, "1.20.0", Some(42877), None),
/// Allows defining generators.
(active, generators, "1.21.0", Some(43122), None),
/// Allows `#[doc(cfg(...))]`.
(active, doc_cfg, "1.21.0", Some(43781), None),
/// Allows `#[doc(masked)]`.
(active, doc_masked, "1.21.0", Some(44027), None),
/// Allows using `crate` as visibility modifier, synonymous with `pub(crate)`.
(active, crate_visibility_modifier, "1.23.0", Some(53120), None),
/// Allows defining `extern type`s.
(active, extern_types, "1.23.0", Some(43467), None),
/// Allows trait methods with arbitrary self types.
(active, arbitrary_self_types, "1.23.0", Some(44874), None),
/// Allows in-band quantification of lifetime bindings (e.g., `fn foo(x: &'a u8) -> &'a u8`).
(active, in_band_lifetimes, "1.23.0", Some(44524), None),
/// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598).
(active, generic_associated_types, "1.23.0", Some(44265), None),
/// Allows defining `trait X = A + B;` alias items.
(active, trait_alias, "1.24.0", Some(41517), None),
/// Allows inferring `'static` outlives requirements (RFC 2093).
(active, infer_static_outlives_requirements, "1.26.0", Some(54185), None),
/// Allows inconsistent bounds in where clauses.
(active, trivial_bounds, "1.28.0", Some(48214), None),
/// Allows `'a: { break 'a; }`.
(active, label_break_value, "1.28.0", Some(48594), None),
/// Allows using `#[doc(keyword = "...")]`.
(active, doc_keyword, "1.28.0", Some(51315), None),
/// Allows using `try {...}` expressions.
(active, try_blocks, "1.29.0", Some(31436), None),
/// Allows defining an `#[alloc_error_handler]`.
(active, alloc_error_handler, "1.29.0", Some(51540), None),
/// Allows using the `amdgpu-kernel` ABI.
(active, abi_amdgpu_kernel, "1.29.0", Some(51575), None),
/// Allows `#[marker]` on certain traits allowing overlapping implementations.
(active, marker_trait_attr, "1.30.0", Some(29864), None),
/// Allows macro attributes on expressions, statements and non-inline modules.
(active, proc_macro_hygiene, "1.30.0", Some(54727), None),
/// Allows unsized rvalues at arguments and parameters.
(incomplete, unsized_locals, "1.30.0", Some(48055), None),
/// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.
(active, custom_test_frameworks, "1.30.0", Some(50297), None),
/// Allows non-builtin attributes in inner attribute position.
(active, custom_inner_attributes, "1.30.0", Some(54726), None),
/// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check.
(active, lint_reasons, "1.31.0", Some(54503), None),
/// Allows exhaustive integer pattern matching on `usize` and `isize`.
(active, precise_pointer_size_matching, "1.32.0", Some(56354), None),
/// Allows using `#[ffi_returns_twice]` on foreign functions.
(active, ffi_returns_twice, "1.34.0", Some(58314), None),
/// Allows using `#[optimize(X)]`.
(active, optimize_attribute, "1.34.0", Some(54882), None),
/// Allows using C-variadics.
(active, c_variadic, "1.34.0", Some(44930), None),
/// Allows the user of associated type bounds.
(active, associated_type_bounds, "1.34.0", Some(52662), None),
/// Allows `if/while p && let q = r && ...` chains.
(incomplete, let_chains, "1.37.0", Some(53667), None),
/// Allows #[repr(transparent)] on unions (RFC 2645).
(active, transparent_unions, "1.37.0", Some(60405), None),
/// Allows explicit discriminants on non-unit enum variants.
(active, arbitrary_enum_discriminant, "1.37.0", Some(60553), None),
/// Allows `async || body` closures.
(active, async_closure, "1.37.0", Some(62290), 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 definition of `const extern fn` and `const unsafe extern fn`.
(active, const_extern_fn, "1.40.0", Some(64926), None),
/// Allows the use of raw-dylibs (RFC 2627).
(incomplete, raw_dylib, "1.40.0", Some(58713), None),
/// Allows making `dyn Trait` well-formed even if `Trait` is not object safe.
/// In that case, `dyn Trait: Trait` does not hold. Moreover, coercions and
/// casts in safe Rust to `dyn Trait` for such a `Trait` is also forbidden.
(active, object_safe_for_dispatch, "1.40.0", Some(43561), None),
/// Allows using the `efiapi` ABI.
(active, abi_efiapi, "1.40.0", Some(65815), None),
/// Allows `&raw const $place_expr` and `&raw mut $place_expr` expressions.
(active, raw_ref_op, "1.41.0", Some(64490), None),
/// Allows diverging expressions to fall back to `!` rather than `()`.
(active, never_type_fallback, "1.41.0", Some(65992), None),
/// Allows using the `#[register_attr]` attribute.
(active, register_attr, "1.41.0", Some(66080), None),
/// Allows using the `#[register_tool]` attribute.
(active, register_tool, "1.41.0", Some(66079), None),
/// Allows the use of `#[cfg(sanitize = "option")]`; set when -Zsanitizer is used.
(active, cfg_sanitize, "1.41.0", Some(39699), None),
/// Allows using `..X`, `..=X`, `...X`, and `X..` as a pattern.
(active, half_open_range_patterns, "1.41.0", Some(67264), None),
/// Allows using `&mut` in constant functions.
(active, const_mut_refs, "1.41.0", Some(57349), None),
/// Allows `impl const Trait for T` syntax.
(active, const_trait_impl, "1.42.0", Some(67792), None),
/// Allows the use of `no_sanitize` attribute.
(active, no_sanitize, "1.42.0", Some(39699), None),
// Allows limiting the evaluation steps of const expressions
(active, const_eval_limit, "1.43.0", Some(67217), None),
/// Allow negative trait implementations.
(active, negative_impls, "1.44.0", Some(68318), None),
/// Allows the use of `#[target_feature]` on safe functions.
(active, target_feature_11, "1.45.0", Some(69098), None),
/// Allow conditional compilation depending on rust version
(active, cfg_version, "1.45.0", Some(64796), None),
/// Allows the use of `#[ffi_pure]` on foreign functions.
(active, ffi_pure, "1.45.0", Some(58329), None),
/// Allows the use of `#[ffi_const]` on foreign functions.
(active, ffi_const, "1.45.0", Some(58328), None),
/// Allows `extern "avr-interrupt" fn()` and `extern "avr-non-blocking-interrupt" fn()`.
(active, abi_avr_interrupt, "1.45.0", Some(69664), 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 `if let` guard in match arms.
(active, if_let_guard, "1.47.0", Some(51114), 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 using and casting function pointers in a `const fn`.
(active, const_fn_fn_ptr_basics, "1.48.0", Some(57563), None),
/// Allows to use the `#[cmse_nonsecure_entry]` attribute.
(active, cmse_nonsecure_entry, "1.48.0", Some(75835), None),
/// Allows rustc to inject a default alloc_error_handler
(active, default_alloc_error_handler, "1.48.0", Some(66741), None),
/// Allows argument and return position `impl Trait` in a `const fn`.
(active, const_impl_trait, "1.48.0", Some(77463), None),
/// Allows `#[instruction_set(_)]` attribute
(active, isa_attribute, "1.48.0", Some(74727), None),
/// Allow anonymous constants from an inline `const` block
(incomplete, inline_const, "1.49.0", Some(76001), None),
/// Allows unsized fn parameters.
(active, unsized_fn_params, "1.49.0", Some(48055), None),
/// Allows the use of destructuring assignments.
(active, destructuring_assignment, "1.49.0", Some(71126), None),
/// Enables `#[cfg(panic = "...")]` config key.
(active, cfg_panic, "1.49.0", Some(77443), None),
/// Allows capturing disjoint fields in a closure/generator (RFC 2229).
(incomplete, capture_disjoint_fields, "1.49.0", Some(53488), None),
/// Allows const generics to have default values (e.g. `struct Foo<const N: usize = 3>(...);`).
(active, const_generics_defaults, "1.51.0", Some(44580), None),
/// Allows references to types with interior mutability within constants
(active, const_refs_to_cell, "1.51.0", Some(80384), None),
/// Allows using `pointer` and `reference` in intra-doc links
(active, intra_doc_pointers, "1.51.0", Some(80896), None),
/// Allows `extern "C-cmse-nonsecure-call" fn()`.
(active, abi_c_cmse_nonsecure_call, "1.51.0", Some(81391), None),
/// Allows associated types in inherent impls.
(incomplete, inherent_associated_types, "1.52.0", Some(8995), None),
// Allows setting the threshold for the `large_assignments` lint.
(active, large_assignments, "1.52.0", Some(83518), None),
/// Allows `extern "C-unwind" fn` to enable unwinding across ABI boundaries.
(active, c_unwind, "1.52.0", Some(74990), None),
/// Allows using `#[repr(align(...))]` on function items
(active, fn_align, "1.53.0", Some(82232), None),
/// Allows `extern "wasm" fn`
(active, wasm_abi, "1.53.0", Some(83788), None),
/// Allows function attribute `#[no_coverage]`, to bypass coverage
/// instrumentation of that function.
(active, no_coverage, "1.53.0", Some(84605), None),
/// Allows trait bounds in `const fn`.
(active, const_fn_trait_bound, "1.53.0", Some(57563), None),
/// Allows `async {}` expressions in const contexts.
(active, const_async_blocks, "1.53.0", Some(85368), None),
/// Allows using imported `main` function
(active, imported_main, "1.53.0", Some(28937), None),
/// Allows specifying modifiers in the link attribute: `#[link(modifiers = "...")]`
(active, native_link_modifiers, "1.53.0", Some(81490), None),
/// Allows specifying the bundle link modifier
(active, native_link_modifiers_bundle, "1.53.0", Some(81490), None),
/// Allows specifying the verbatim link modifier
(active, native_link_modifiers_verbatim, "1.53.0", Some(81490), None),
/// Allows specifying the whole-archive link modifier
(active, native_link_modifiers_whole_archive, "1.53.0", Some(81490), None),
/// Allows specifying the as-needed link modifier
(active, native_link_modifiers_as_needed, "1.53.0", Some(81490), None),
/// Allows qualified paths in struct expressions, struct patterns and tuple struct patterns.
(active, more_qualified_paths, "1.54.0", Some(86935), None),
/// Allows `cfg(target_abi = "...")`.
(active, cfg_target_abi, "1.55.0", Some(80970), None),
/// Infer generic args for both consts and types.
(active, generic_arg_infer, "1.55.0", Some(85077), None),
/// Allows `#[derive(Default)]` and `#[default]` on enums.
(active, derive_default_enum, "1.56.0", Some(86985), None),
/// Allows `for _ in _` loops in const contexts.
(active, const_for, "1.56.0", Some(87575), None),
/// Allows the `?` operator in const contexts.
(active, const_try, "1.56.0", Some(74935), 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 explicit generic arguments specification with `impl Trait` present.
(active, explicit_generic_args_with_impl_trait, "1.56.0", Some(83701), None),
/// Allows using doc(primitive) without a future-incompat warning
(active, doc_primitive, "1.56.0", Some(88070), 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 additional const parameter types, such as `&'static str` or user defined types
(incomplete, adt_const_params, "1.56.0", Some(44580), None),
/// Allows `let...else` statements.
(active, let_else, "1.56.0", Some(87335), None),
/// Allows the `#[must_not_suspend]` attribute.
(active, must_not_suspend, "1.57.0", Some(83310), None),
/// Allows `#[track_caller]` on closures and generators.
(active, closure_track_caller, "1.57.0", Some(87417), None),
/// Allows `#[doc(cfg_hide(...))]`.
(active, doc_cfg_hide, "1.57.0", Some(43781), None),
/// Allows using the `non_exhaustive_omitted_patterns` lint.
(active, non_exhaustive_omitted_patterns_lint, "1.57.0", Some(89554), None),
/// Allows creation of instances of a struct by moving fields that have
/// not changed from prior instances of the same struct (RFC #2528)
(incomplete, type_changing_struct_update, "1.58.0", Some(86555), None),
/// Tells rustdoc to automatically generate `#[doc(cfg(...))]`.
(active, doc_auto_cfg, "1.58.0", Some(43781), None),
/// Allows using `const` operands in inline assembly.
(active, asm_const, "1.58.0", Some(72016), None),
/// Allows using `sym` operands in inline assembly.
(active, asm_sym, "1.58.0", Some(72016), None),
/// Enables experimental inline assembly support for additional architectures.
(active, asm_experimental_arch, "1.58.0", Some(72016), None),
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates

206
compiler/rustc_feature/src/removed.rs
View file

@ -45,132 +45,130 @@ declare_features! (
// feature-group-start: removed features
// -------------------------------------------------------------------------
(removed, import_shadowing, "1.0.0", None, None, None),
(removed, managed_boxes, "1.0.0", None, None, None),
/// Allows use of unary negate on unsigned integers, e.g., -e for e: u8
(removed, negate_unsigned, "1.0.0", Some(29645), None, None),
(removed, reflect, "1.0.0", Some(27749), None, None),
/// A way to temporarily opt out of opt in copy. This will *never* be accepted.
(removed, opt_out_copy, "1.0.0", None, None, None),
(removed, quad_precision_float, "1.0.0", None, None, None),
(removed, struct_inherit, "1.0.0", None, None, None),
(removed, test_removed_feature, "1.0.0", None, None, None),
(removed, visible_private_types, "1.0.0", None, None, None),
(removed, unsafe_no_drop_flag, "1.0.0", None, None, None),
/// Allows using items which are missing stability attributes
(removed, unmarked_api, "1.0.0", None, None, None),
(removed, allocator, "1.0.0", None, None, None),
(removed, simd, "1.0.0", Some(27731), None,
Some("removed in favor of `#[repr(simd)]`")),
(removed, advanced_slice_patterns, "1.0.0", Some(62254), None,
Some("merged into `#![feature(slice_patterns)]`")),
(removed, macro_reexport, "1.0.0", Some(29638), None,
Some("subsumed by `pub use`")),
/// Allows using custom attributes (RFC 572).
(removed, custom_attribute, "1.0.0", Some(29642), None,
Some("removed in favor of `#![register_tool]` and `#![register_attr]`")),
/// Allows features specific to OIBIT (now called auto traits).
/// Renamed to `auto_traits`.
(removed, optin_builtin_traits, "1.0.0", Some(13231), None,
Some("renamed to `auto_traits`")),
(removed, pushpop_unsafe, "1.2.0", None, None, None),
(removed, needs_allocator, "1.4.0", Some(27389), None,
Some("subsumed by `#![feature(allocator_internals)]`")),
/// Allows identifying crates that contain sanitizer runtimes.
(removed, sanitizer_runtime, "1.17.0", None, None, None),
/// Allows `#[doc(spotlight)]`.
/// The attribute was renamed to `#[doc(notable_trait)]`
/// and the feature to `doc_notable_trait`.
(removed, doc_spotlight, "1.22.0", Some(45040), None,
Some("renamed to `doc_notable_trait`")),
(removed, proc_macro_mod, "1.27.0", Some(54727), None,
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
(removed, proc_macro_expr, "1.27.0", Some(54727), None,
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
(removed, proc_macro_non_items, "1.27.0", Some(54727), None,
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
(removed, proc_macro_gen, "1.27.0", Some(54727), None,
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
(removed, panic_implementation, "1.28.0", Some(44489), None,
Some("subsumed by `#[panic_handler]`")),
/// Allows the use of `#[derive(Anything)]` as sugar for `#[derive_Anything]`.
(removed, custom_derive, "1.32.0", Some(29644), None,
Some("subsumed by `#[proc_macro_derive]`")),
/// Paths of the form: `extern::foo::bar`
(removed, extern_in_paths, "1.33.0", Some(55600), None,
Some("subsumed by `::foo::bar` paths")),
(removed, quote, "1.33.0", Some(29601), None, None),
(removed, allocator, "1.0.0", None, None, None),
(removed, await_macro, "1.38.0", Some(50547), None,
Some("subsumed by `.await` syntax")),
/// Allows comparing raw pointers during const eval.
(removed, const_compare_raw_pointers, "1.46.0", Some(53020), None,
Some("cannot be allowed in const eval in any meaningful way")),
/// Allows non-trivial generic constants which have to be manually propagated upwards.
(removed, const_evaluatable_checked, "1.48.0", Some(76560), None, Some("renamed to `generic_const_exprs`")),
/// Allows the definition of `const` functions with some advanced features.
(removed, const_fn, "1.54.0", Some(57563), None,
Some("split into finer-grained feature gates")),
/// Allows const generic types (e.g. `struct Foo<const N: usize>(...);`).
(removed, const_generics, "1.34.0", Some(44580), None,
Some("removed in favor of `#![feature(adt_const_params)]` and `#![feature(generic_const_exprs)]`")),
/// Allows `[x; N]` where `x` is a constant (RFC 2203).
(removed, const_in_array_repeat_expressions, "1.37.0", Some(49147), None,
Some("removed due to causing promotable bugs")),
/// Allows casting raw pointers to `usize` during const eval.
(removed, const_raw_ptr_to_usize_cast, "1.55.0", Some(51910), None,
Some("at compile-time, pointers do not have an integer value, so these casts cannot be properly supported")),
/// Allows `T: ?const Trait` syntax in bounds.
(removed, const_trait_bound_opt_out, "1.42.0", Some(67794), None,
Some("Removed in favor of `~const` bound in #![feature(const_trait_impl)]")),
/// Allows using custom attributes (RFC 572).
(removed, custom_attribute, "1.0.0", Some(29642), None,
Some("removed in favor of `#![register_tool]` and `#![register_attr]`")),
/// Allows the use of `#[derive(Anything)]` as sugar for `#[derive_Anything]`.
(removed, custom_derive, "1.32.0", Some(29644), None,
Some("subsumed by `#[proc_macro_derive]`")),
/// Allows `#[doc(spotlight)]`.
/// The attribute was renamed to `#[doc(notable_trait)]`
/// and the feature to `doc_notable_trait`.
(removed, doc_spotlight, "1.22.0", Some(45040), None,
Some("renamed to `doc_notable_trait`")),
/// Allows using `#[unsafe_destructor_blind_to_params]` (RFC 1238).
(removed, dropck_parametricity, "1.38.0", Some(28498), None, None),
(removed, await_macro, "1.38.0", Some(50547), None,
Some("subsumed by `.await` syntax")),
/// Allows defining `existential type`s.
(removed, existential_type, "1.38.0", Some(63063), None,
Some("removed in favor of `#![feature(type_alias_impl_trait)]`")),
/// Paths of the form: `extern::foo::bar`
(removed, extern_in_paths, "1.33.0", Some(55600), None,
Some("subsumed by `::foo::bar` paths")),
/// Allows `#[doc(include = "some-file")]`.
(removed, external_doc, "1.54.0", Some(44732), None,
Some("use #[doc = include_str!(\"filename\")] instead, which handles macro invocations")),
/// Allows `impl Trait` in bindings (`let`, `const`, `static`).
(removed, impl_trait_in_bindings, "1.55.0", Some(63065), None,
Some("the implementation was not maintainable, the feature may get reintroduced once the current refactorings are done")),
(removed, import_shadowing, "1.0.0", None, None, None),
/// Lazily evaluate constants. This allows constants to depend on type parameters.
(removed, lazy_normalization_consts, "1.46.0", Some(72219), None, Some("superseded by `generic_const_exprs`")),
/// Allows using the `#[link_args]` attribute.
(removed, link_args, "1.53.0", Some(29596), None,
Some("removed in favor of using `-C link-arg=ARG` on command line, \
which is available from cargo build scripts with `cargo:rustc-link-arg` now")),
(removed, macro_reexport, "1.0.0", Some(29638), None,
Some("subsumed by `pub use`")),
/// Allows using `#[main]` to replace the entrypoint `#[lang = "start"]` calls.
(removed, main, "1.53.0", Some(29634), None, None),
(removed, managed_boxes, "1.0.0", None, None, None),
/// Allows the use of type alias impl trait in function return positions
(removed, min_type_alias_impl_trait, "1.56.0", Some(63063), None,
Some("removed in favor of full type_alias_impl_trait")),
(removed, needs_allocator, "1.4.0", Some(27389), None,
Some("subsumed by `#![feature(allocator_internals)]`")),
/// Allows use of unary negate on unsigned integers, e.g., -e for e: u8
(removed, negate_unsigned, "1.0.0", Some(29645), None, None),
/// Allows `#[no_debug]`.
(removed, no_debug, "1.43.0", Some(29721), None, Some("removed due to lack of demand")),
/// Allows using `#[on_unimplemented(..)]` on traits.
/// (Moved to `rustc_attrs`.)
(removed, on_unimplemented, "1.40.0", None, None, None),
/// A way to temporarily opt out of opt in copy. This will *never* be accepted.
(removed, opt_out_copy, "1.0.0", None, None, None),
/// Allows features specific to OIBIT (now called auto traits).
/// Renamed to `auto_traits`.
(removed, optin_builtin_traits, "1.0.0", Some(13231), None,
Some("renamed to `auto_traits`")),
/// Allows overlapping impls of marker traits.
(removed, overlapping_marker_traits, "1.42.0", Some(29864), None,
Some("removed in favor of `#![feature(marker_trait_attr)]`")),
(removed, panic_implementation, "1.28.0", Some(44489), None,
Some("subsumed by `#[panic_handler]`")),
/// Allows using `#[plugin_registrar]` on functions.
(removed, plugin_registrar, "1.54.0", Some(29597), None,
Some("a __rustc_plugin_registrar symbol must now be defined instead")),
(removed, proc_macro_expr, "1.27.0", Some(54727), None,
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
(removed, proc_macro_gen, "1.27.0", Some(54727), None,
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
(removed, proc_macro_mod, "1.27.0", Some(54727), None,
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
(removed, proc_macro_non_items, "1.27.0", Some(54727), None,
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
(removed, pub_macro_rules, "1.53.0", Some(78855), None,
Some("removed due to being incomplete, in particular it does not work across crates")),
(removed, pushpop_unsafe, "1.2.0", None, None, None),
(removed, quad_precision_float, "1.0.0", None, None, None),
(removed, quote, "1.33.0", Some(29601), None, None),
(removed, reflect, "1.0.0", Some(27749), None, None),
/// Allows using the macros:
/// + `__diagnostic_used`
/// + `__register_diagnostic`
/// +`__build_diagnostic_array`
(removed, rustc_diagnostic_macros, "1.38.0", None, None, None),
/// Allows using `#[on_unimplemented(..)]` on traits.
/// (Moved to `rustc_attrs`.)
(removed, on_unimplemented, "1.40.0", None, None, None),
/// Allows overlapping impls of marker traits.
(removed, overlapping_marker_traits, "1.42.0", Some(29864), None,
Some("removed in favor of `#![feature(marker_trait_attr)]`")),
/// Allows `T: ?const Trait` syntax in bounds.
(removed, const_trait_bound_opt_out, "1.42.0", Some(67794), None,
Some("Removed in favor of `~const` bound in #![feature(const_trait_impl)]")),
/// Allows `#[no_debug]`.
(removed, no_debug, "1.43.0", Some(29721), None, Some("removed due to lack of demand")),
/// Lazily evaluate constants. This allows constants to depend on type parameters.
(removed, lazy_normalization_consts, "1.46.0", Some(72219), None, Some("superseded by `generic_const_exprs`")),
/// Allows comparing raw pointers during const eval.
(removed, const_compare_raw_pointers, "1.46.0", Some(53020), None,
Some("cannot be allowed in const eval in any meaningful way")),
/// Allows non-trivial generic constants which have to be manually propagated upwards.
(removed, const_evaluatable_checked, "1.48.0", Some(76560), None, Some("renamed to `generic_const_exprs`")),
/// Allows using the `#[link_args]` attribute.
(removed, link_args, "1.53.0", Some(29596), None,
Some("removed in favor of using `-C link-arg=ARG` on command line, \
which is available from cargo build scripts with `cargo:rustc-link-arg` now")),
/// Allows using `#[main]` to replace the entrypoint `#[lang = "start"]` calls.
(removed, main, "1.53.0", Some(29634), None, None),
(removed, pub_macro_rules, "1.53.0", Some(78855), None,
Some("removed due to being incomplete, in particular it does not work across crates")),
/// Allows the definition of `const` functions with some advanced features.
(removed, const_fn, "1.54.0", Some(57563), None,
Some("split into finer-grained feature gates")),
/// Allows using `#[plugin_registrar]` on functions.
(removed, plugin_registrar, "1.54.0", Some(29597), None,
Some("a __rustc_plugin_registrar symbol must now be defined instead")),
/// Allows `#[doc(include = "some-file")]`.
(removed, external_doc, "1.54.0", Some(44732), None,
Some("use #[doc = include_str!(\"filename\")] instead, which handles macro invocations")),
/// Allows casting raw pointers to `usize` during const eval.
(removed, const_raw_ptr_to_usize_cast, "1.55.0", Some(51910), None,
Some("at compile-time, pointers do not have an integer value, so these casts cannot be properly supported")),
/// Allows `impl Trait` in bindings (`let`, `const`, `static`).
(removed, impl_trait_in_bindings, "1.55.0", Some(63065), None,
Some("the implementation was not maintainable, the feature may get reintroduced once the current refactorings are done")),
/// Allows the use of type alias impl trait in function return positions
(removed, min_type_alias_impl_trait, "1.56.0", Some(63063), None,
Some("removed in favor of full type_alias_impl_trait")),
/// Allows identifying crates that contain sanitizer runtimes.
(removed, sanitizer_runtime, "1.17.0", None, None, None),
(removed, simd, "1.0.0", Some(27731), None,
Some("removed in favor of `#[repr(simd)]`")),
(removed, struct_inherit, "1.0.0", None, None, None),
(removed, test_removed_feature, "1.0.0", None, None, None),
/// Allows using items which are missing stability attributes
(removed, unmarked_api, "1.0.0", None, None, None),
(removed, unsafe_no_drop_flag, "1.0.0", None, None, None),
/// Allows `#[unwind(..)]`.
///
/// Permits specifying whether a function should permit unwinding or abort on unwind.
(removed, unwind_attributes, "1.56.0", Some(58760), None, Some("use the C-unwind ABI instead")),
(removed, visible_private_types, "1.0.0", None, None, None),
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// -------------------------------------------------------------------------
// feature-group-end: removed features

47
src/tools/tidy/src/features.rs
View file

@ -7,7 +7,7 @@
//! * Library features have at most one stability level.
//! * Library features have at most one `since` value.
//! * All unstable lang features have tests to ensure they are actually unstable.
//! * Language features in a group are sorted by `since` value.
//! * Language features in a group are sorted by feature name.
use std::collections::HashMap;
use std::fmt;
@ -258,7 +258,7 @@ fn collect_lang_features_in(base: &Path, file: &str, bad: &mut bool) -> Features
let mut next_feature_omits_tracking_issue = false;
let mut in_feature_group = false;
let mut prev_since = None;
let mut prev_names = vec![];
contents
.lines()
@ -291,11 +291,11 @@ fn collect_lang_features_in(base: &Path, file: &str, bad: &mut bool) -> Features
}
in_feature_group = true;
prev_since = None;
prev_names = vec![];
return None;
} else if line.starts_with(FEATURE_GROUP_END_PREFIX) {
in_feature_group = false;
prev_since = None;
prev_names = vec![];
return None;
}
@ -325,16 +325,49 @@ fn collect_lang_features_in(base: &Path, file: &str, bad: &mut bool) -> Features
}
};
if in_feature_group {
if prev_since > since {
if prev_names.last() > Some(&name) {
// This assumes the user adds the feature name at the end of the list, as we're
// not looking ahead.
let correct_index = match prev_names.binary_search(&name) {
Ok(_) => {
// This only occurs when the feature name has already been declared.
tidy_error!(
bad,
"{}:{}: duplicate feature {}",
path.display(),
line_number,
name,
);
// skip any additional checks for this line
return None;
}
Err(index) => index,
};
let correct_placement = if correct_index == 0 {
"at the beginning of the feature group".to_owned()
} else if correct_index == prev_names.len() {
// I don't believe this is reachable given the above assumption, but it
// doesn't hurt to be safe.
"at the end of the feature group".to_owned()
} else {
format!(
"between {} and {}",
prev_names[correct_index - 1],
prev_names[correct_index],
)
};
tidy_error!(
bad,
"{}:{}: feature {} is not sorted by \"since\" (version number)",
"{}:{}: feature {} is not sorted by feature name (should be {})",
path.display(),
line_number,
name,
correct_placement,
);
}
prev_since = since;
prev_names.push(name);
}
let issue_str = parts.next().unwrap().trim();