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Auto merge of #63824 - Centril:split-feature_gate, r=oli-obk
Refactor `feature_gate.rs` into modules & cleanup Split `src/libsyntax/feature_gate.rs` into `src/libsyntax/feature_gate/` with files: - `accepted.rs` (accepted feature gates) - `removed.rs` (...) - `active.rs` (...) - `builtin_attrs.rs` (definition of builtin attributes and their gates as well as gating `cfg` flags) - `check.rs` (post expansion checking of feature gates) - `mod.rs` (just reexports) Additionally, `tidy.rs` is adjusted to respect the new scheme. Also, `builtin_attrs.rs` sees some cleanup, organization, and DSL-ification to reduce repetition. This is probably best read commit-by-commit I think. r? @oli-obk
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236
src/libsyntax/feature_gate/accepted.rs
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236
src/libsyntax/feature_gate/accepted.rs
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@ -0,0 +1,236 @@
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//! List of the accepted feature gates.
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use crate::symbol::{Symbol, sym};
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macro_rules! declare_features {
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($((accepted, $feature: ident, $ver: expr, $issue: expr, None),)+) => {
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/// Those language feature has since been Accepted (it was once Active)
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pub const ACCEPTED_FEATURES: &[(Symbol, &str, Option<u32>, Option<&str>)] = &[
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$((sym::$feature, $ver, $issue, None)),+
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];
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}
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}
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declare_features! (
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// -------------------------------------------------------------------------
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// feature-group-start: for testing purposes
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// -------------------------------------------------------------------------
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// A temporary feature gate used to enable parser extensions needed
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// to bootstrap fix for #5723.
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(accepted, issue_5723_bootstrap, "1.0.0", None, None),
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// These are used to test this portion of the compiler,
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// they don't actually mean anything.
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(accepted, test_accepted_feature, "1.0.0", None, None),
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// -------------------------------------------------------------------------
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// feature-group-end: for testing purposes
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// -------------------------------------------------------------------------
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// -------------------------------------------------------------------------
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// feature-group-start: accepted features
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// -------------------------------------------------------------------------
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// Allows using associated `type`s in `trait`s.
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(accepted, associated_types, "1.0.0", None, None),
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// Allows using assigning a default type to type parameters in algebraic data type definitions.
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(accepted, default_type_params, "1.0.0", None, None),
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// FIXME: explain `globs`.
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(accepted, globs, "1.0.0", None, None),
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// Allows `macro_rules!` items.
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(accepted, macro_rules, "1.0.0", None, None),
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// Allows use of `&foo[a..b]` as a slicing syntax.
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(accepted, slicing_syntax, "1.0.0", None, None),
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// Allows struct variants `Foo { baz: u8, .. }` in enums (RFC 418).
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(accepted, struct_variant, "1.0.0", None, None),
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// Allows indexing tuples.
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(accepted, tuple_indexing, "1.0.0", None, None),
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// Allows the use of `if let` expressions.
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(accepted, if_let, "1.0.0", None, None),
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// Allows the use of `while let` expressions.
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(accepted, while_let, "1.0.0", None, None),
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// Allows using `#![no_std]`.
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(accepted, no_std, "1.6.0", None, None),
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// Allows overloading augmented assignment operations like `a += b`.
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(accepted, augmented_assignments, "1.8.0", Some(28235), None),
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// Allows empty structs and enum variants with braces.
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(accepted, braced_empty_structs, "1.8.0", Some(29720), None),
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// Allows `#[deprecated]` attribute.
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(accepted, deprecated, "1.9.0", Some(29935), None),
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// Allows macros to appear in the type position.
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(accepted, type_macros, "1.13.0", Some(27245), None),
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// Allows use of the postfix `?` operator in expressions.
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(accepted, question_mark, "1.13.0", Some(31436), None),
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// Allows `..` in tuple (struct) patterns.
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(accepted, dotdot_in_tuple_patterns, "1.14.0", Some(33627), None),
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// Allows some increased flexibility in the name resolution rules,
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// especially around globs and shadowing (RFC 1560).
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(accepted, item_like_imports, "1.15.0", Some(35120), None),
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// Allows using `Self` and associated types in struct expressions and patterns.
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(accepted, more_struct_aliases, "1.16.0", Some(37544), None),
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// Allows elision of `'static` lifetimes in `static`s and `const`s.
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(accepted, static_in_const, "1.17.0", Some(35897), None),
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// Allows field shorthands (`x` meaning `x: x`) in struct literal expressions.
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(accepted, field_init_shorthand, "1.17.0", Some(37340), None),
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// Allows the definition recursive static items.
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(accepted, static_recursion, "1.17.0", Some(29719), None),
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// Allows `pub(restricted)` visibilities (RFC 1422).
|
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(accepted, pub_restricted, "1.18.0", Some(32409), None),
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// Allows `#![windows_subsystem]`.
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(accepted, windows_subsystem, "1.18.0", Some(37499), None),
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// Allows `break {expr}` with a value inside `loop`s.
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(accepted, loop_break_value, "1.19.0", Some(37339), None),
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// Allows numeric fields in struct expressions and patterns.
|
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(accepted, relaxed_adts, "1.19.0", Some(35626), None),
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// Allows coercing non capturing closures to function pointers.
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(accepted, closure_to_fn_coercion, "1.19.0", Some(39817), None),
|
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// Allows attributes on struct literal fields.
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(accepted, struct_field_attributes, "1.20.0", Some(38814), None),
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// Allows the definition of associated constants in `trait` or `impl` blocks.
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(accepted, associated_consts, "1.20.0", Some(29646), None),
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// Allows usage of the `compile_error!` macro.
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(accepted, compile_error, "1.20.0", Some(40872), None),
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// Allows code like `let x: &'static u32 = &42` to work (RFC 1414).
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(accepted, rvalue_static_promotion, "1.21.0", Some(38865), None),
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// Allows `Drop` types in constants (RFC 1440).
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||||
(accepted, drop_types_in_const, "1.22.0", Some(33156), None),
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// Allows the sysV64 ABI to be specified on all platforms
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// instead of just the platforms on which it is the C ABI.
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||||
(accepted, abi_sysv64, "1.24.0", Some(36167), None),
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// Allows `repr(align(16))` struct attribute (RFC 1358).
|
||||
(accepted, repr_align, "1.25.0", Some(33626), None),
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||||
// Allows '|' at beginning of match arms (RFC 1925).
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||||
(accepted, match_beginning_vert, "1.25.0", Some(44101), None),
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||||
// Allows nested groups in `use` items (RFC 2128).
|
||||
(accepted, use_nested_groups, "1.25.0", Some(44494), None),
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// Allows indexing into constant arrays.
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(accepted, const_indexing, "1.26.0", Some(29947), None),
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// Allows using `a..=b` and `..=b` as inclusive range syntaxes.
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(accepted, inclusive_range_syntax, "1.26.0", Some(28237), None),
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// Allows `..=` in patterns (RFC 1192).
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(accepted, dotdoteq_in_patterns, "1.26.0", Some(28237), None),
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// Allows `fn main()` with return types which implements `Termination` (RFC 1937).
|
||||
(accepted, termination_trait, "1.26.0", Some(43301), None),
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// 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).
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||||
(accepted, copy_closures, "1.26.0", Some(44490), None),
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// Allows `impl Trait` in function arguments.
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||||
(accepted, universal_impl_trait, "1.26.0", Some(34511), None),
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// Allows `impl Trait` in function return types.
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(accepted, conservative_impl_trait, "1.26.0", Some(34511), None),
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// Allows using the `u128` and `i128` types.
|
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(accepted, i128_type, "1.26.0", Some(35118), None),
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// Allows default match binding modes (RFC 2005).
|
||||
(accepted, match_default_bindings, "1.26.0", Some(42640), None),
|
||||
// Allows `'_` placeholder lifetimes.
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||||
(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),
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// Allows `cfg(target_feature = "...")`.
|
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(accepted, cfg_target_feature, "1.27.0", Some(29717), None),
|
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// Allows `#[target_feature(...)]`.
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(accepted, target_feature, "1.27.0", None, None),
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// Allows using `dyn Trait` as a syntax for trait objects.
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(accepted, dyn_trait, "1.27.0", Some(44662), None),
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// Allows `#[must_use]` on functions, and introduces must-use operators (RFC 1940).
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(accepted, fn_must_use, "1.27.0", Some(43302), None),
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// Allows use of the `:lifetime` macro fragment specifier.
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(accepted, macro_lifetime_matcher, "1.27.0", Some(34303), None),
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// Allows `#[test]` functions where the return type implements `Termination` (RFC 1937).
|
||||
(accepted, termination_trait_test, "1.27.0", Some(48854), None),
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// Allows the `#[global_allocator]` attribute.
|
||||
(accepted, global_allocator, "1.28.0", Some(27389), None),
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// Allows `#[repr(transparent)]` attribute on newtype structs.
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(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),
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||||
// 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
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(accepted, macro_vis_matcher, "1.30.0", Some(41022), None),
|
||||
// Allows importing and reexporting macros with `use`,
|
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// enables macro modularization in general.
|
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(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.
|
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(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).
|
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(accepted, infer_outlives_requirements, "1.30.0", Some(44493), None),
|
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// Allows annotating functions conforming to `fn(&PanicInfo) -> !` with `#[panic_handler]`.
|
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// This defines the behavior of panics.
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(accepted, panic_handler, "1.30.0", Some(44489), None),
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||||
// Allows `#[used]` to preserve symbols (see llvm.used).
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||||
(accepted, used, "1.30.0", Some(40289), None),
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// Allows `crate` in paths.
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||||
(accepted, crate_in_paths, "1.30.0", Some(45477), None),
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// Allows resolving absolute paths as paths from other crates.
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(accepted, extern_absolute_paths, "1.30.0", Some(44660), None),
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// Allows access to crate names passed via `--extern` through prelude.
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(accepted, extern_prelude, "1.30.0", Some(44660), None),
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// Allows parentheses in patterns.
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(accepted, pattern_parentheses, "1.31.0", Some(51087), None),
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// Allows the definition of `const fn` functions.
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(accepted, min_const_fn, "1.31.0", Some(53555), None),
|
||||
// Allows scoped lints.
|
||||
(accepted, tool_lints, "1.31.0", Some(44690), None),
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||||
// Allows lifetime elision in `impl` headers. For example:
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// + `impl<I:Iterator> Iterator for &mut Iterator`
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// + `impl Debug for Foo<'_>`
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(accepted, impl_header_lifetime_elision, "1.31.0", Some(15872), None),
|
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// Allows `extern crate foo as bar;`. This puts `bar` into extern prelude.
|
||||
(accepted, extern_crate_item_prelude, "1.31.0", Some(55599), None),
|
||||
// Allows use of the `:literal` macro fragment specifier (RFC 1576).
|
||||
(accepted, macro_literal_matcher, "1.32.0", Some(35625), None),
|
||||
// Allows use of `?` as the Kleene "at most one" operator in macros.
|
||||
(accepted, macro_at_most_once_rep, "1.32.0", Some(48075), None),
|
||||
// Allows `Self` struct constructor (RFC 2302).
|
||||
(accepted, self_struct_ctor, "1.32.0", Some(51994), None),
|
||||
// Allows `Self` in type definitions (RFC 2300).
|
||||
(accepted, self_in_typedefs, "1.32.0", Some(49303), None),
|
||||
// Allows `use x::y;` to search `x` in the current scope.
|
||||
(accepted, uniform_paths, "1.32.0", Some(53130), None),
|
||||
// Allows integer match exhaustiveness checking (RFC 2591).
|
||||
(accepted, exhaustive_integer_patterns, "1.33.0", Some(50907), None),
|
||||
// Allows `use path as _;` and `extern crate c as _;`.
|
||||
(accepted, underscore_imports, "1.33.0", Some(48216), None),
|
||||
// Allows `#[repr(packed(N))]` attribute on structs.
|
||||
(accepted, repr_packed, "1.33.0", Some(33158), None),
|
||||
// Allows irrefutable patterns in `if let` and `while let` statements (RFC 2086).
|
||||
(accepted, irrefutable_let_patterns, "1.33.0", Some(44495), None),
|
||||
// Allows calling `const unsafe fn` inside `unsafe` blocks in `const fn` functions.
|
||||
(accepted, min_const_unsafe_fn, "1.33.0", Some(55607), None),
|
||||
// Allows let bindings, assignments and destructuring in `const` functions and constants.
|
||||
// As long as control flow is not implemented in const eval, `&&` and `||` may not be used
|
||||
// at the same time as let bindings.
|
||||
(accepted, const_let, "1.33.0", Some(48821), None),
|
||||
// Allows `#[cfg_attr(predicate, multiple, attributes, here)]`.
|
||||
(accepted, cfg_attr_multi, "1.33.0", Some(54881), None),
|
||||
// Allows top level or-patterns (`p | q`) in `if let` and `while let`.
|
||||
(accepted, if_while_or_patterns, "1.33.0", Some(48215), None),
|
||||
// Allows `cfg(target_vendor = "...")`.
|
||||
(accepted, cfg_target_vendor, "1.33.0", Some(29718), None),
|
||||
// Allows `extern crate self as foo;`.
|
||||
// This puts local crate root into extern prelude under name `foo`.
|
||||
(accepted, extern_crate_self, "1.34.0", Some(56409), None),
|
||||
// Allows arbitrary delimited token streams in non-macro attributes.
|
||||
(accepted, unrestricted_attribute_tokens, "1.34.0", Some(55208), None),
|
||||
// Allows paths to enum variants on type aliases including `Self`.
|
||||
(accepted, type_alias_enum_variants, "1.37.0", Some(49683), None),
|
||||
// Allows using `#[repr(align(X))]` on enums with equivalent semantics
|
||||
// to wrapping an enum in a wrapper struct with `#[repr(align(X))]`.
|
||||
(accepted, repr_align_enum, "1.37.0", Some(57996), None),
|
||||
// Allows `const _: TYPE = VALUE`.
|
||||
(accepted, underscore_const_names, "1.37.0", Some(54912), None),
|
||||
// Allows free and inherent `async fn`s, `async` blocks, and `<expr>.await` expressions.
|
||||
(accepted, async_await, "1.39.0", Some(50547), None),
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// feature-group-end: accepted features
|
||||
// -------------------------------------------------------------------------
|
||||
);
|
||||
522
src/libsyntax/feature_gate/active.rs
Normal file
522
src/libsyntax/feature_gate/active.rs
Normal file
@ -0,0 +1,522 @@
|
||||
//! List of the active feature gates.
|
||||
|
||||
use crate::edition::Edition;
|
||||
use crate::symbol::{Symbol, sym};
|
||||
use syntax_pos::Span;
|
||||
|
||||
macro_rules! set {
|
||||
($field: ident) => {{
|
||||
fn f(features: &mut Features, _: Span) {
|
||||
features.$field = true;
|
||||
}
|
||||
f as fn(&mut Features, Span)
|
||||
}}
|
||||
}
|
||||
|
||||
macro_rules! declare_features {
|
||||
($((active, $feature: ident, $ver: expr, $issue: expr, $edition: expr),)+) => {
|
||||
/// Represents active features that are currently being implemented or
|
||||
/// currently being considered for addition/removal.
|
||||
pub const ACTIVE_FEATURES:
|
||||
&[(Symbol, &str, Option<u32>, Option<Edition>, fn(&mut Features, Span))] =
|
||||
&[$((sym::$feature, $ver, $issue, $edition, set!($feature))),+];
|
||||
|
||||
/// A set of features to be used by later passes.
|
||||
#[derive(Clone)]
|
||||
pub struct Features {
|
||||
/// `#![feature]` attrs for language features, for error reporting
|
||||
pub declared_lang_features: Vec<(Symbol, Span, Option<Symbol>)>,
|
||||
/// `#![feature]` attrs for non-language (library) features
|
||||
pub declared_lib_features: Vec<(Symbol, Span)>,
|
||||
$(pub $feature: bool),+
|
||||
}
|
||||
|
||||
impl Features {
|
||||
pub fn new() -> Features {
|
||||
Features {
|
||||
declared_lang_features: Vec::new(),
|
||||
declared_lib_features: Vec::new(),
|
||||
$($feature: false),+
|
||||
}
|
||||
}
|
||||
|
||||
pub fn walk_feature_fields<F>(&self, mut f: F)
|
||||
where F: FnMut(&str, bool)
|
||||
{
|
||||
$(f(stringify!($feature), self.$feature);)+
|
||||
}
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
// If you change this, please modify `src/doc/unstable-book` as well.
|
||||
//
|
||||
// Don't ever remove anything from this list; move them to `removed.rs`.
|
||||
//
|
||||
// The version numbers here correspond to the version in which the current status
|
||||
// was set. This is most important for knowing when a particular feature became
|
||||
// stable (active).
|
||||
//
|
||||
// Note that the features are grouped into internal/user-facing and then
|
||||
// sorted by version inside those groups. This is inforced with tidy.
|
||||
//
|
||||
// N.B., `tools/tidy/src/features.rs` parses this information directly out of the
|
||||
// source, so take care when modifying it.
|
||||
|
||||
declare_features! (
|
||||
// -------------------------------------------------------------------------
|
||||
// feature-group-start: internal feature gates
|
||||
// -------------------------------------------------------------------------
|
||||
|
||||
// no-tracking-issue-start
|
||||
|
||||
// Allows using compiler's own crates.
|
||||
(active, rustc_private, "1.0.0", Some(27812), None),
|
||||
|
||||
// Allows using the `rust-intrinsic`'s "ABI".
|
||||
(active, intrinsics, "1.0.0", None, None),
|
||||
|
||||
// Allows using `#[lang = ".."]` attribute for linking items to special compiler logic.
|
||||
(active, lang_items, "1.0.0", None, None),
|
||||
|
||||
// Allows using the `#[stable]` and `#[unstable]` attributes.
|
||||
(active, staged_api, "1.0.0", None, None),
|
||||
|
||||
// Allows using `#[allow_internal_unstable]`. This is an
|
||||
// attribute on `macro_rules!` and can't use the attribute handling
|
||||
// below (it has to be checked before expansion possibly makes
|
||||
// macros disappear).
|
||||
(active, allow_internal_unstable, "1.0.0", None, None),
|
||||
|
||||
// Allows using `#[allow_internal_unsafe]`. This is an
|
||||
// attribute on `macro_rules!` and can't use the attribute handling
|
||||
// below (it has to be checked before expansion possibly makes
|
||||
// macros disappear).
|
||||
(active, allow_internal_unsafe, "1.0.0", None, None),
|
||||
|
||||
// Allows using the macros:
|
||||
// + `__diagnostic_used`
|
||||
// + `__register_diagnostic`
|
||||
// +`__build_diagnostic_array`
|
||||
(active, rustc_diagnostic_macros, "1.0.0", None, None),
|
||||
|
||||
// Allows using `#[rustc_const_unstable(feature = "foo", ..)]` which
|
||||
// lets a function to be `const` when opted into with `#![feature(foo)]`.
|
||||
(active, rustc_const_unstable, "1.0.0", None, None),
|
||||
|
||||
// no-tracking-issue-end
|
||||
|
||||
// Allows using `#[link_name="llvm.*"]`.
|
||||
(active, link_llvm_intrinsics, "1.0.0", Some(29602), None),
|
||||
|
||||
// Allows using `rustc_*` attributes (RFC 572).
|
||||
(active, rustc_attrs, "1.0.0", Some(29642), None),
|
||||
|
||||
// Allows using `#[on_unimplemented(..)]` on traits.
|
||||
(active, on_unimplemented, "1.0.0", Some(29628), None),
|
||||
|
||||
// Allows using the `box $expr` syntax.
|
||||
(active, box_syntax, "1.0.0", Some(49733), None),
|
||||
|
||||
// Allows using `#[main]` to replace the entrypoint `#[lang = "start"]` calls.
|
||||
(active, main, "1.0.0", Some(29634), None),
|
||||
|
||||
// Allows using `#[start]` on a function indicating that it is the program entrypoint.
|
||||
(active, start, "1.0.0", Some(29633), None),
|
||||
|
||||
// Allows using the `#[fundamental]` attribute.
|
||||
(active, fundamental, "1.0.0", Some(29635), None),
|
||||
|
||||
// Allows using the `rust-call` ABI.
|
||||
(active, unboxed_closures, "1.0.0", Some(29625), None),
|
||||
|
||||
// Allows using the `#[linkage = ".."]` attribute.
|
||||
(active, linkage, "1.0.0", Some(29603), None),
|
||||
|
||||
// Allows features specific to OIBIT (auto traits).
|
||||
(active, optin_builtin_traits, "1.0.0", Some(13231), None),
|
||||
|
||||
// Allows using `box` in patterns (RFC 469).
|
||||
(active, box_patterns, "1.0.0", Some(29641), None),
|
||||
|
||||
// no-tracking-issue-start
|
||||
|
||||
// Allows using `#[prelude_import]` on glob `use` items.
|
||||
(active, prelude_import, "1.2.0", None, None),
|
||||
|
||||
// no-tracking-issue-end
|
||||
|
||||
// no-tracking-issue-start
|
||||
|
||||
// Allows using `#[omit_gdb_pretty_printer_section]`.
|
||||
(active, omit_gdb_pretty_printer_section, "1.5.0", None, None),
|
||||
|
||||
// Allows using the `vectorcall` ABI.
|
||||
(active, abi_vectorcall, "1.7.0", None, None),
|
||||
|
||||
// no-tracking-issue-end
|
||||
|
||||
// Allows using `#[structural_match]` which indicates that a type is structurally matchable.
|
||||
(active, structural_match, "1.8.0", Some(31434), None),
|
||||
|
||||
// Allows using the `may_dangle` attribute (RFC 1327).
|
||||
(active, dropck_eyepatch, "1.10.0", Some(34761), None),
|
||||
|
||||
// Allows using the `#![panic_runtime]` attribute.
|
||||
(active, panic_runtime, "1.10.0", Some(32837), None),
|
||||
|
||||
// Allows declaring with `#![needs_panic_runtime]` that a panic runtime is needed.
|
||||
(active, needs_panic_runtime, "1.10.0", Some(32837), None),
|
||||
|
||||
// no-tracking-issue-start
|
||||
|
||||
// Allows identifying the `compiler_builtins` crate.
|
||||
(active, compiler_builtins, "1.13.0", None, None),
|
||||
|
||||
// Allows using the `unadjusted` ABI; perma-unstable.
|
||||
(active, abi_unadjusted, "1.16.0", None, None),
|
||||
|
||||
// Allows identifying crates that contain sanitizer runtimes.
|
||||
(active, sanitizer_runtime, "1.17.0", None, None),
|
||||
|
||||
// Used to identify crates that contain the profiler runtime.
|
||||
(active, profiler_runtime, "1.18.0", None, None),
|
||||
|
||||
// Allows using the `thiscall` ABI.
|
||||
(active, abi_thiscall, "1.19.0", None, None),
|
||||
|
||||
// Allows using `#![needs_allocator]`, an implementation detail of `#[global_allocator]`.
|
||||
(active, allocator_internals, "1.20.0", None, None),
|
||||
|
||||
// no-tracking-issue-end
|
||||
|
||||
// Added for testing E0705; perma-unstable.
|
||||
(active, test_2018_feature, "1.31.0", Some(0), Some(Edition::Edition2018)),
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// feature-group-end: internal feature gates
|
||||
// -------------------------------------------------------------------------
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// feature-group-start: actual feature gates (target features)
|
||||
// -------------------------------------------------------------------------
|
||||
|
||||
// FIXME: Document these and merge with the list below.
|
||||
|
||||
// Unstable `#[target_feature]` directives.
|
||||
(active, arm_target_feature, "1.27.0", Some(44839), None),
|
||||
(active, aarch64_target_feature, "1.27.0", Some(44839), None),
|
||||
(active, hexagon_target_feature, "1.27.0", Some(44839), None),
|
||||
(active, powerpc_target_feature, "1.27.0", Some(44839), None),
|
||||
(active, mips_target_feature, "1.27.0", Some(44839), None),
|
||||
(active, avx512_target_feature, "1.27.0", Some(44839), None),
|
||||
(active, mmx_target_feature, "1.27.0", Some(44839), None),
|
||||
(active, sse4a_target_feature, "1.27.0", Some(44839), None),
|
||||
(active, tbm_target_feature, "1.27.0", Some(44839), None),
|
||||
(active, wasm_target_feature, "1.30.0", Some(44839), None),
|
||||
(active, adx_target_feature, "1.32.0", Some(44839), None),
|
||||
(active, cmpxchg16b_target_feature, "1.32.0", Some(44839), None),
|
||||
(active, movbe_target_feature, "1.34.0", Some(44839), None),
|
||||
(active, rtm_target_feature, "1.35.0", Some(44839), None),
|
||||
(active, f16c_target_feature, "1.36.0", Some(44839), None),
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// feature-group-end: actual feature gates (target features)
|
||||
// -------------------------------------------------------------------------
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// feature-group-start: actual feature gates
|
||||
// -------------------------------------------------------------------------
|
||||
|
||||
// Allows using the `#[link_args]` attribute.
|
||||
(active, link_args, "1.0.0", Some(29596), None),
|
||||
|
||||
// Allows defining identifiers beyond ASCII.
|
||||
(active, non_ascii_idents, "1.0.0", Some(55467), None),
|
||||
|
||||
// Allows using `#[plugin_registrar]` on functions.
|
||||
(active, plugin_registrar, "1.0.0", Some(29597), None),
|
||||
|
||||
// Allows using `#![plugin(myplugin)]`.
|
||||
(active, plugin, "1.0.0", Some(29597), None),
|
||||
|
||||
// Allows using `#[thread_local]` on `static` items.
|
||||
(active, thread_local, "1.0.0", Some(29594), None),
|
||||
|
||||
// Allows the use of SIMD types in functions declared in `extern` blocks.
|
||||
(active, simd_ffi, "1.0.0", Some(27731), None),
|
||||
|
||||
// Allows using custom attributes (RFC 572).
|
||||
(active, custom_attribute, "1.0.0", Some(29642), None),
|
||||
|
||||
// Allows using non lexical lifetimes (RFC 2094).
|
||||
(active, nll, "1.0.0", Some(43234), None),
|
||||
|
||||
// Allows using slice patterns.
|
||||
(active, slice_patterns, "1.0.0", Some(62254), None),
|
||||
|
||||
// Allows the definition of `const` functions with some advanced features.
|
||||
(active, const_fn, "1.2.0", Some(57563), None),
|
||||
|
||||
// Allows associated type defaults.
|
||||
(active, associated_type_defaults, "1.2.0", Some(29661), None),
|
||||
|
||||
// Allows `#![no_core]`.
|
||||
(active, no_core, "1.3.0", Some(29639), None),
|
||||
|
||||
// Allows default type parameters to influence type inference.
|
||||
(active, default_type_parameter_fallback, "1.3.0", Some(27336), None),
|
||||
|
||||
// Allows `repr(simd)` and importing the various simd intrinsics.
|
||||
(active, repr_simd, "1.4.0", Some(27731), None),
|
||||
|
||||
// Allows `extern "platform-intrinsic" { ... }`.
|
||||
(active, platform_intrinsics, "1.4.0", Some(27731), None),
|
||||
|
||||
// Allows `#[unwind(..)]`.
|
||||
//
|
||||
// Permits specifying whether a function should permit unwinding or abort on unwind.
|
||||
(active, unwind_attributes, "1.4.0", Some(58760), None),
|
||||
|
||||
// Allows `#[no_debug]`.
|
||||
(active, no_debug, "1.5.0", Some(29721), None),
|
||||
|
||||
// Allows attributes on expressions and non-item statements.
|
||||
(active, stmt_expr_attributes, "1.6.0", Some(15701), None),
|
||||
|
||||
// Allows the use of type ascription in expressions.
|
||||
(active, type_ascription, "1.6.0", Some(23416), None),
|
||||
|
||||
// Allows `cfg(target_thread_local)`.
|
||||
(active, cfg_target_thread_local, "1.7.0", Some(29594), None),
|
||||
|
||||
// Allows specialization of implementations (RFC 1210).
|
||||
(active, specialization, "1.7.0", Some(31844), None),
|
||||
|
||||
// Allows using `#[naked]` on functions.
|
||||
(active, naked_functions, "1.9.0", Some(32408), None),
|
||||
|
||||
// Allows `cfg(target_has_atomic = "...")`.
|
||||
(active, cfg_target_has_atomic, "1.9.0", Some(32976), None),
|
||||
|
||||
// Allows `X..Y` patterns.
|
||||
(active, exclusive_range_pattern, "1.11.0", Some(37854), None),
|
||||
|
||||
// Allows 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 untagged unions `union U { ... }`.
|
||||
(active, untagged_unions, "1.13.0", Some(32836), None),
|
||||
|
||||
// Allows `#[link(..., cfg(..))]`.
|
||||
(active, link_cfg, "1.14.0", Some(37406), None),
|
||||
|
||||
// Allows `extern "ptx-*" fn()`.
|
||||
(active, abi_ptx, "1.15.0", Some(38788), None),
|
||||
|
||||
// Allows the `#[repr(i128)]` attribute for enums.
|
||||
(active, repr128, "1.16.0", Some(35118), None),
|
||||
|
||||
// Allows `#[link(kind="static-nobundle"...)]`.
|
||||
(active, static_nobundle, "1.16.0", Some(37403), None),
|
||||
|
||||
// Allows `extern "msp430-interrupt" fn()`.
|
||||
(active, abi_msp430_interrupt, "1.16.0", Some(38487), None),
|
||||
|
||||
// Allows declarative macros 2.0 (`macro`).
|
||||
(active, decl_macro, "1.17.0", Some(39412), None),
|
||||
|
||||
// Allows `extern "x86-interrupt" fn()`.
|
||||
(active, abi_x86_interrupt, "1.17.0", Some(40180), None),
|
||||
|
||||
// Allows overlapping impls of marker traits.
|
||||
(active, overlapping_marker_traits, "1.18.0", Some(29864), None),
|
||||
|
||||
// Allows a test to fail without failing the whole suite.
|
||||
(active, allow_fail, "1.19.0", Some(46488), None),
|
||||
|
||||
// Allows unsized tuple coercion.
|
||||
(active, unsized_tuple_coercion, "1.20.0", Some(42877), None),
|
||||
|
||||
// Allows defining generators.
|
||||
(active, generators, "1.21.0", Some(43122), None),
|
||||
|
||||
// Allows `#[doc(cfg(...))]`.
|
||||
(active, doc_cfg, "1.21.0", Some(43781), None),
|
||||
|
||||
// Allows `#[doc(masked)]`.
|
||||
(active, doc_masked, "1.21.0", Some(44027), None),
|
||||
|
||||
// Allows `#[doc(spotlight)]`.
|
||||
(active, doc_spotlight, "1.22.0", Some(45040), None),
|
||||
|
||||
// Allows `#[doc(include = "some-file")]`.
|
||||
(active, external_doc, "1.22.0", Some(44732), None),
|
||||
|
||||
// Allows future-proofing enums/structs with the `#[non_exhaustive]` attribute (RFC 2008).
|
||||
(active, non_exhaustive, "1.22.0", Some(44109), None),
|
||||
|
||||
// Allows using `crate` as visibility modifier, synonymous with `pub(crate)`.
|
||||
(active, crate_visibility_modifier, "1.23.0", Some(53120), None),
|
||||
|
||||
// Allows defining `extern type`s.
|
||||
(active, extern_types, "1.23.0", Some(43467), None),
|
||||
|
||||
// Allows trait methods with arbitrary self types.
|
||||
(active, arbitrary_self_types, "1.23.0", Some(44874), None),
|
||||
|
||||
// Allows in-band quantification of lifetime bindings (e.g., `fn foo(x: &'a u8) -> &'a u8`).
|
||||
(active, in_band_lifetimes, "1.23.0", Some(44524), None),
|
||||
|
||||
// Allows associated types to be generic, e.g., `type Foo<T>;` (RFC 1598).
|
||||
(active, generic_associated_types, "1.23.0", Some(44265), None),
|
||||
|
||||
// Allows defining `trait X = A + B;` alias items.
|
||||
(active, trait_alias, "1.24.0", Some(41517), None),
|
||||
|
||||
// Allows infering `'static` outlives requirements (RFC 2093).
|
||||
(active, infer_static_outlives_requirements, "1.26.0", Some(54185), None),
|
||||
|
||||
// Allows macro invocations in `extern {}` blocks.
|
||||
(active, macros_in_extern, "1.27.0", Some(49476), None),
|
||||
|
||||
// Allows accessing fields of unions inside `const` functions.
|
||||
(active, const_fn_union, "1.27.0", Some(51909), None),
|
||||
|
||||
// Allows casting raw pointers to `usize` during const eval.
|
||||
(active, const_raw_ptr_to_usize_cast, "1.27.0", Some(51910), None),
|
||||
|
||||
// Allows dereferencing raw pointers during const eval.
|
||||
(active, const_raw_ptr_deref, "1.27.0", Some(51911), None),
|
||||
|
||||
// Allows comparing raw pointers during const eval.
|
||||
(active, const_compare_raw_pointers, "1.27.0", Some(53020), None),
|
||||
|
||||
// Allows `#[doc(alias = "...")]`.
|
||||
(active, doc_alias, "1.27.0", Some(50146), None),
|
||||
|
||||
// Allows inconsistent bounds in where clauses.
|
||||
(active, trivial_bounds, "1.28.0", Some(48214), None),
|
||||
|
||||
// Allows `'a: { break 'a; }`.
|
||||
(active, label_break_value, "1.28.0", Some(48594), None),
|
||||
|
||||
// Allows using `#[doc(keyword = "...")]`.
|
||||
(active, doc_keyword, "1.28.0", Some(51315), None),
|
||||
|
||||
// Allows reinterpretation of the bits of a value of one type as another type during const eval.
|
||||
(active, const_transmute, "1.29.0", Some(53605), None),
|
||||
|
||||
// Allows using `try {...}` expressions.
|
||||
(active, try_blocks, "1.29.0", Some(31436), None),
|
||||
|
||||
// Allows defining an `#[alloc_error_handler]`.
|
||||
(active, alloc_error_handler, "1.29.0", Some(51540), None),
|
||||
|
||||
// Allows using the `amdgpu-kernel` ABI.
|
||||
(active, abi_amdgpu_kernel, "1.29.0", Some(51575), None),
|
||||
|
||||
// Allows panicking during const eval (producing compile-time errors).
|
||||
(active, const_panic, "1.30.0", Some(51999), None),
|
||||
|
||||
// Allows `#[marker]` on certain traits allowing overlapping implementations.
|
||||
(active, marker_trait_attr, "1.30.0", Some(29864), None),
|
||||
|
||||
// Allows macro invocations on modules expressions and statements and
|
||||
// procedural macros to expand to non-items.
|
||||
(active, proc_macro_hygiene, "1.30.0", Some(54727), None),
|
||||
|
||||
// Allows unsized rvalues at arguments and parameters.
|
||||
(active, unsized_locals, "1.30.0", Some(48055), None),
|
||||
|
||||
// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.
|
||||
(active, custom_test_frameworks, "1.30.0", Some(50297), None),
|
||||
|
||||
// Allows non-builtin attributes in inner attribute position.
|
||||
(active, custom_inner_attributes, "1.30.0", Some(54726), None),
|
||||
|
||||
// Allows mixing bind-by-move in patterns and references to those identifiers in guards.
|
||||
(active, bind_by_move_pattern_guards, "1.30.0", Some(15287), None),
|
||||
|
||||
// Allows `impl Trait` in bindings (`let`, `const`, `static`).
|
||||
(active, impl_trait_in_bindings, "1.30.0", Some(63065), None),
|
||||
|
||||
// Allows using `reason` in lint attributes and the `#[expect(lint)]` lint check.
|
||||
(active, lint_reasons, "1.31.0", Some(54503), None),
|
||||
|
||||
// Allows exhaustive integer pattern matching on `usize` and `isize`.
|
||||
(active, precise_pointer_size_matching, "1.32.0", Some(56354), None),
|
||||
|
||||
// Allows relaxing the coherence rules such that
|
||||
// `impl<T> ForeignTrait<LocalType> for ForeignType<T> is permitted.
|
||||
(active, re_rebalance_coherence, "1.32.0", Some(55437), None),
|
||||
|
||||
// Allows using `#[ffi_returns_twice]` on foreign functions.
|
||||
(active, ffi_returns_twice, "1.34.0", Some(58314), None),
|
||||
|
||||
// Allows const generic types (e.g. `struct Foo<const N: usize>(...);`).
|
||||
(active, const_generics, "1.34.0", Some(44580), None),
|
||||
|
||||
// Allows using `#[optimize(X)]`.
|
||||
(active, optimize_attribute, "1.34.0", Some(54882), None),
|
||||
|
||||
// Allows using C-variadics.
|
||||
(active, c_variadic, "1.34.0", Some(44930), None),
|
||||
|
||||
// Allows the user of associated type bounds.
|
||||
(active, associated_type_bounds, "1.34.0", Some(52662), None),
|
||||
|
||||
// Attributes on formal function params.
|
||||
(active, param_attrs, "1.36.0", Some(60406), None),
|
||||
|
||||
// Allows calling constructor functions in `const fn`.
|
||||
(active, const_constructor, "1.37.0", Some(61456), None),
|
||||
|
||||
// Allows `if/while p && let q = r && ...` chains.
|
||||
(active, let_chains, "1.37.0", Some(53667), None),
|
||||
|
||||
// Allows #[repr(transparent)] on enums (RFC 2645).
|
||||
(active, transparent_enums, "1.37.0", Some(60405), None),
|
||||
|
||||
// Allows #[repr(transparent)] on unions (RFC 2645).
|
||||
(active, transparent_unions, "1.37.0", Some(60405), None),
|
||||
|
||||
// Allows explicit discriminants on non-unit enum variants.
|
||||
(active, arbitrary_enum_discriminant, "1.37.0", Some(60553), None),
|
||||
|
||||
// Allows `impl Trait` with multiple unrelated lifetimes.
|
||||
(active, member_constraints, "1.37.0", Some(61977), None),
|
||||
|
||||
// Allows `async || body` closures.
|
||||
(active, async_closure, "1.37.0", Some(62290), None),
|
||||
|
||||
// Allows the use of `#[cfg(doctest)]`, set when rustdoc is collecting doctests
|
||||
(active, cfg_doctest, "1.37.0", Some(62210), None),
|
||||
|
||||
// Allows `[x; N]` where `x` is a constant (RFC 2203).
|
||||
(active, const_in_array_repeat_expressions, "1.37.0", Some(49147), None),
|
||||
|
||||
// Allows `impl Trait` to be used inside type aliases (RFC 2515).
|
||||
(active, type_alias_impl_trait, "1.38.0", Some(63063), None),
|
||||
|
||||
// Allows the use of or-patterns, e.g. `0 | 1`.
|
||||
(active, or_patterns, "1.38.0", Some(54883), None),
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// feature-group-end: actual feature gates
|
||||
// -------------------------------------------------------------------------
|
||||
);
|
||||
|
||||
/// Some features are known to be incomplete and using them is likely to have
|
||||
/// unanticipated results, such as compiler crashes. We warn the user about these
|
||||
/// to alert them.
|
||||
pub const INCOMPLETE_FEATURES: &[Symbol] = &[
|
||||
sym::impl_trait_in_bindings,
|
||||
sym::generic_associated_types,
|
||||
sym::const_generics,
|
||||
sym::or_patterns,
|
||||
sym::let_chains,
|
||||
];
|
||||
562
src/libsyntax/feature_gate/builtin_attrs.rs
Normal file
562
src/libsyntax/feature_gate/builtin_attrs.rs
Normal file
@ -0,0 +1,562 @@
|
||||
//! Built-in attributes and `cfg` flag gating.
|
||||
|
||||
use AttributeType::*;
|
||||
use AttributeGate::*;
|
||||
|
||||
use super::check::{emit_feature_err, GateIssue};
|
||||
use super::check::{Stability, EXPLAIN_ALLOW_INTERNAL_UNSAFE, EXPLAIN_ALLOW_INTERNAL_UNSTABLE};
|
||||
use super::active::Features;
|
||||
|
||||
use crate::ast;
|
||||
use crate::attr::AttributeTemplate;
|
||||
use crate::symbol::{Symbol, sym};
|
||||
use crate::parse::ParseSess;
|
||||
|
||||
use syntax_pos::Span;
|
||||
use rustc_data_structures::fx::FxHashMap;
|
||||
use lazy_static::lazy_static;
|
||||
|
||||
type GateFn = fn(&Features) -> bool;
|
||||
|
||||
macro_rules! cfg_fn {
|
||||
($field: ident) => {
|
||||
(|features| { features.$field }) as GateFn
|
||||
}
|
||||
}
|
||||
|
||||
/// `cfg(...)`'s that are feature gated.
|
||||
const GATED_CFGS: &[(Symbol, Symbol, GateFn)] = &[
|
||||
// (name in cfg, feature, function to check if the feature is enabled)
|
||||
(sym::target_thread_local, sym::cfg_target_thread_local, cfg_fn!(cfg_target_thread_local)),
|
||||
(sym::target_has_atomic, sym::cfg_target_has_atomic, cfg_fn!(cfg_target_has_atomic)),
|
||||
(sym::rustdoc, sym::doc_cfg, cfg_fn!(doc_cfg)),
|
||||
(sym::doctest, sym::cfg_doctest, cfg_fn!(cfg_doctest)),
|
||||
];
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct GatedCfg {
|
||||
span: Span,
|
||||
index: usize,
|
||||
}
|
||||
|
||||
impl GatedCfg {
|
||||
pub fn gate(cfg: &ast::MetaItem) -> Option<GatedCfg> {
|
||||
GATED_CFGS.iter()
|
||||
.position(|info| cfg.check_name(info.0))
|
||||
.map(|idx| {
|
||||
GatedCfg {
|
||||
span: cfg.span,
|
||||
index: idx
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
pub fn check_and_emit(&self, sess: &ParseSess, features: &Features) {
|
||||
let (cfg, feature, has_feature) = GATED_CFGS[self.index];
|
||||
if !has_feature(features) && !self.span.allows_unstable(feature) {
|
||||
let explain = format!("`cfg({})` is experimental and subject to change", cfg);
|
||||
emit_feature_err(sess, feature, self.span, GateIssue::Language, &explain);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// If you change this, please modify `src/doc/unstable-book` as well. You must
|
||||
// move that documentation into the relevant place in the other docs, and
|
||||
// remove the chapter on the flag.
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Debug)]
|
||||
pub enum AttributeType {
|
||||
/// Normal, builtin attribute that is consumed
|
||||
/// by the compiler before the unused_attribute check
|
||||
Normal,
|
||||
|
||||
/// Builtin attribute that may not be consumed by the compiler
|
||||
/// before the unused_attribute check. These attributes
|
||||
/// will be ignored by the unused_attribute lint
|
||||
Whitelisted,
|
||||
|
||||
/// Builtin attribute that is only allowed at the crate level
|
||||
CrateLevel,
|
||||
}
|
||||
|
||||
pub enum AttributeGate {
|
||||
/// Is gated by a given feature gate, reason
|
||||
/// and function to check if enabled
|
||||
Gated(Stability, Symbol, &'static str, fn(&Features) -> bool),
|
||||
|
||||
/// Ungated attribute, can be used on all release channels
|
||||
Ungated,
|
||||
}
|
||||
|
||||
// fn() is not Debug
|
||||
impl std::fmt::Debug for AttributeGate {
|
||||
fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
|
||||
match *self {
|
||||
Self::Gated(ref stab, name, expl, _) =>
|
||||
write!(fmt, "Gated({:?}, {}, {})", stab, name, expl),
|
||||
Self::Ungated => write!(fmt, "Ungated")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl AttributeGate {
|
||||
fn is_deprecated(&self) -> bool {
|
||||
match *self {
|
||||
Self::Gated(Stability::Deprecated(_, _), ..) => true,
|
||||
_ => false,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// A convenience macro for constructing attribute templates.
|
||||
/// E.g., `template!(Word, List: "description")` means that the attribute
|
||||
/// supports forms `#[attr]` and `#[attr(description)]`.
|
||||
macro_rules! template {
|
||||
(Word) => { template!(@ true, None, None) };
|
||||
(List: $descr: expr) => { template!(@ false, Some($descr), None) };
|
||||
(NameValueStr: $descr: expr) => { template!(@ false, None, Some($descr)) };
|
||||
(Word, List: $descr: expr) => { template!(@ true, Some($descr), None) };
|
||||
(Word, NameValueStr: $descr: expr) => { template!(@ true, None, Some($descr)) };
|
||||
(List: $descr1: expr, NameValueStr: $descr2: expr) => {
|
||||
template!(@ false, Some($descr1), Some($descr2))
|
||||
};
|
||||
(Word, List: $descr1: expr, NameValueStr: $descr2: expr) => {
|
||||
template!(@ true, Some($descr1), Some($descr2))
|
||||
};
|
||||
(@ $word: expr, $list: expr, $name_value_str: expr) => { AttributeTemplate {
|
||||
word: $word, list: $list, name_value_str: $name_value_str
|
||||
} };
|
||||
}
|
||||
|
||||
macro_rules! ungated {
|
||||
($attr:ident, $typ:expr, $tpl:expr $(,)?) => {
|
||||
(sym::$attr, $typ, $tpl, Ungated)
|
||||
};
|
||||
}
|
||||
|
||||
macro_rules! gated {
|
||||
($attr:ident, $typ:expr, $tpl:expr, $gate:ident, $msg:expr $(,)?) => {
|
||||
(sym::$attr, $typ, $tpl, Gated(Stability::Unstable, sym::$gate, $msg, cfg_fn!($gate)))
|
||||
};
|
||||
($attr:ident, $typ:expr, $tpl:expr, $msg:expr $(,)?) => {
|
||||
(sym::$attr, $typ, $tpl, Gated(Stability::Unstable, sym::$attr, $msg, cfg_fn!($attr)))
|
||||
};
|
||||
}
|
||||
|
||||
macro_rules! rustc_attr {
|
||||
(TEST, $attr:ident, $typ:expr, $tpl:expr $(,)?) => {
|
||||
rustc_attr!(
|
||||
$attr, $typ, $tpl,
|
||||
concat!("the `#[", stringify!($attr), "]` attribute is just used for rustc unit tests \
|
||||
and will never be stable",
|
||||
),
|
||||
)
|
||||
};
|
||||
($attr:ident, $typ:expr, $tpl:expr, $msg:expr $(,)?) => {
|
||||
(sym::$attr, $typ, $tpl,
|
||||
Gated(Stability::Unstable, sym::rustc_attrs, $msg, cfg_fn!(rustc_attrs)))
|
||||
};
|
||||
}
|
||||
|
||||
macro_rules! experimental {
|
||||
($attr:ident) => {
|
||||
concat!("the `#[", stringify!($attr), "]` attribute is an experimental feature")
|
||||
}
|
||||
}
|
||||
|
||||
const IMPL_DETAIL: &str = "internal implementation detail";
|
||||
const INTERAL_UNSTABLE: &str = "this is an internal attribute that will never be stable";
|
||||
|
||||
pub type BuiltinAttribute = (Symbol, AttributeType, AttributeTemplate, AttributeGate);
|
||||
|
||||
/// Attributes that have a special meaning to rustc or rustdoc
|
||||
pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
|
||||
// ==========================================================================
|
||||
// Stable attributes:
|
||||
// ==========================================================================
|
||||
|
||||
// Condtional compilation:
|
||||
ungated!(cfg, Normal, template!(List: "predicate")),
|
||||
ungated!(cfg_attr, Normal, template!(List: "predicate, attr1, attr2, ...")),
|
||||
|
||||
// Testing:
|
||||
ungated!(ignore, Normal, template!(Word, NameValueStr: "reason")),
|
||||
ungated!(
|
||||
should_panic, Normal,
|
||||
template!(Word, List: r#"expected = "reason"#, NameValueStr: "reason"),
|
||||
),
|
||||
// FIXME(Centril): This can be used on stable but shouldn't.
|
||||
ungated!(reexport_test_harness_main, Normal, template!(NameValueStr: "name")),
|
||||
|
||||
// Macros:
|
||||
ungated!(derive, Normal, template!(List: "Trait1, Trait2, ...")),
|
||||
ungated!(automatically_derived, Normal, template!(Word)),
|
||||
// FIXME(#14407)
|
||||
ungated!(macro_use, Normal, template!(Word, List: "name1, name2, ...")),
|
||||
ungated!(macro_escape, Normal, template!(Word)), // Deprecated synonym for `macro_use`.
|
||||
ungated!(macro_export, Normal, template!(Word, List: "local_inner_macros")),
|
||||
ungated!(proc_macro, Normal, template!(Word)),
|
||||
ungated!(
|
||||
proc_macro_derive, Normal,
|
||||
template!(List: "TraitName, /*opt*/ attributes(name1, name2, ...)"),
|
||||
),
|
||||
ungated!(proc_macro_attribute, Normal, template!(Word)),
|
||||
|
||||
// Lints:
|
||||
ungated!(warn, Normal, template!(List: r#"lint1, lint2, ..., /*opt*/ reason = "...""#)),
|
||||
ungated!(allow, Normal, template!(List: r#"lint1, lint2, ..., /*opt*/ reason = "...""#)),
|
||||
ungated!(forbid, Normal, template!(List: r#"lint1, lint2, ..., /*opt*/ reason = "...""#)),
|
||||
ungated!(deny, Normal, template!(List: r#"lint1, lint2, ..., /*opt*/ reason = "...""#)),
|
||||
ungated!(must_use, Whitelisted, template!(Word, NameValueStr: "reason")),
|
||||
// FIXME(#14407)
|
||||
ungated!(
|
||||
deprecated, Normal,
|
||||
template!(
|
||||
Word,
|
||||
List: r#"/*opt*/ since = "version", /*opt*/ note = "reason""#,
|
||||
NameValueStr: "reason"
|
||||
),
|
||||
),
|
||||
|
||||
// Crate properties:
|
||||
ungated!(crate_name, CrateLevel, template!(NameValueStr: "name")),
|
||||
ungated!(crate_type, CrateLevel, template!(NameValueStr: "bin|lib|...")),
|
||||
ungated!(crate_id, CrateLevel, template!(NameValueStr: "ignored")),
|
||||
|
||||
// ABI, linking, symbols, and FFI
|
||||
ungated!(
|
||||
link, Whitelisted,
|
||||
template!(List: r#"name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ cfg = "...""#),
|
||||
),
|
||||
ungated!(link_name, Whitelisted, template!(NameValueStr: "name")),
|
||||
ungated!(no_link, Normal, template!(Word)),
|
||||
ungated!(repr, Normal, template!(List: "C, packed, ...")),
|
||||
ungated!(export_name, Whitelisted, template!(NameValueStr: "name")),
|
||||
ungated!(link_section, Whitelisted, template!(NameValueStr: "name")),
|
||||
ungated!(no_mangle, Whitelisted, template!(Word)),
|
||||
ungated!(used, Whitelisted, template!(Word)),
|
||||
|
||||
// Limits:
|
||||
ungated!(recursion_limit, CrateLevel, template!(NameValueStr: "N")),
|
||||
ungated!(type_length_limit, CrateLevel, template!(NameValueStr: "N")),
|
||||
|
||||
// Entry point:
|
||||
ungated!(main, Normal, template!(Word)),
|
||||
ungated!(start, Normal, template!(Word)),
|
||||
ungated!(no_start, CrateLevel, template!(Word)),
|
||||
ungated!(no_main, CrateLevel, template!(Word)),
|
||||
|
||||
// Modules, prelude, and resolution:
|
||||
ungated!(path, Normal, template!(NameValueStr: "file")),
|
||||
ungated!(no_std, CrateLevel, template!(Word)),
|
||||
ungated!(no_implicit_prelude, Normal, template!(Word)),
|
||||
|
||||
// Runtime
|
||||
ungated!(windows_subsystem, Whitelisted, template!(NameValueStr: "windows|console")),
|
||||
ungated!(panic_handler, Normal, template!(Word)), // RFC 2070
|
||||
|
||||
// Code generation:
|
||||
ungated!(inline, Whitelisted, template!(Word, List: "always|never")),
|
||||
ungated!(cold, Whitelisted, template!(Word)),
|
||||
ungated!(no_builtins, Whitelisted, template!(Word)),
|
||||
ungated!(target_feature, Whitelisted, template!(List: r#"enable = "name""#)),
|
||||
|
||||
// FIXME: #14408 whitelist docs since rustdoc looks at them
|
||||
ungated!(doc, Whitelisted, template!(List: "hidden|inline|...", NameValueStr: "string")),
|
||||
|
||||
// ==========================================================================
|
||||
// Unstable attributes:
|
||||
// ==========================================================================
|
||||
|
||||
// Linking:
|
||||
gated!(naked, Whitelisted, template!(Word), naked_functions, experimental!(naked)),
|
||||
gated!(
|
||||
link_args, Normal, template!(NameValueStr: "args"),
|
||||
"the `link_args` attribute is experimental and not portable across platforms, \
|
||||
it is recommended to use `#[link(name = \"foo\")] instead",
|
||||
),
|
||||
|
||||
// Plugins:
|
||||
ungated!(plugin_registrar, Normal, template!(Word)),
|
||||
gated!(
|
||||
plugin, CrateLevel, template!(List: "name|name(args)"),
|
||||
"compiler plugins are experimental and possibly buggy",
|
||||
),
|
||||
|
||||
// Testing:
|
||||
gated!(allow_fail, Normal, template!(Word), experimental!(allow_fail)),
|
||||
gated!(
|
||||
test_runner, CrateLevel, template!(List: "path"), custom_test_frameworks,
|
||||
"custom test frameworks are an unstable feature",
|
||||
),
|
||||
|
||||
// RFC #2008
|
||||
gated!(non_exhaustive, Whitelisted, template!(Word), experimental!(non_exhaustive)),
|
||||
// RFC #1268
|
||||
gated!(marker, Normal, template!(Word), marker_trait_attr, experimental!(marker)),
|
||||
gated!(
|
||||
thread_local, Whitelisted, template!(Word),
|
||||
"`#[thread_local]` is an experimental feature, and does not currently handle destructors",
|
||||
),
|
||||
gated!(no_core, CrateLevel, template!(Word), experimental!(no_core)),
|
||||
// RFC 2412
|
||||
gated!(
|
||||
optimize, Whitelisted, template!(List: "size|speed"), optimize_attribute,
|
||||
experimental!(optimize),
|
||||
),
|
||||
|
||||
gated!(ffi_returns_twice, Whitelisted, template!(Word), experimental!(ffi_returns_twice)),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes: Stability, deprecation, and unsafe:
|
||||
// ==========================================================================
|
||||
|
||||
ungated!(feature, CrateLevel, template!(List: "name1, name1, ...")),
|
||||
// FIXME(#14407) -- only looked at on-demand so we can't
|
||||
// guarantee they'll have already been checked.
|
||||
ungated!(
|
||||
rustc_deprecated, Whitelisted,
|
||||
template!(List: r#"since = "version", reason = "...""#)
|
||||
),
|
||||
// FIXME(#14407)
|
||||
ungated!(stable, Whitelisted, template!(List: r#"feature = "name", since = "version""#)),
|
||||
// FIXME(#14407)
|
||||
ungated!(
|
||||
unstable, Whitelisted,
|
||||
template!(List: r#"feature = "name", reason = "...", issue = "N""#),
|
||||
),
|
||||
gated!(
|
||||
rustc_const_unstable, Normal, template!(List: r#"feature = "name""#),
|
||||
"the `#[rustc_const_unstable]` attribute is an internal feature",
|
||||
),
|
||||
gated!(
|
||||
allow_internal_unstable, Normal, template!(Word, List: "feat1, feat2, ..."),
|
||||
EXPLAIN_ALLOW_INTERNAL_UNSTABLE,
|
||||
),
|
||||
gated!(allow_internal_unsafe, Normal, template!(Word), EXPLAIN_ALLOW_INTERNAL_UNSAFE),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes: Type system related:
|
||||
// ==========================================================================
|
||||
|
||||
gated!(fundamental, Whitelisted, template!(Word), experimental!(fundamental)),
|
||||
gated!(
|
||||
// RFC #1445.
|
||||
structural_match, Whitelisted, template!(Word),
|
||||
"the semantics of constant patterns is not yet settled",
|
||||
),
|
||||
gated!(
|
||||
may_dangle, Normal, template!(Word), dropck_eyepatch,
|
||||
"`may_dangle` has unstable semantics and may be removed in the future",
|
||||
),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes: Runtime related:
|
||||
// ==========================================================================
|
||||
|
||||
rustc_attr!(rustc_allocator, Whitelisted, template!(Word), IMPL_DETAIL),
|
||||
rustc_attr!(rustc_allocator_nounwind, Whitelisted, template!(Word), IMPL_DETAIL),
|
||||
gated!(alloc_error_handler, Normal, template!(Word), experimental!(alloc_error_handler)),
|
||||
gated!(
|
||||
default_lib_allocator, Whitelisted, template!(Word), allocator_internals,
|
||||
experimental!(default_lib_allocator),
|
||||
),
|
||||
gated!(
|
||||
needs_allocator, Normal, template!(Word), allocator_internals,
|
||||
experimental!(needs_allocator),
|
||||
),
|
||||
gated!(panic_runtime, Whitelisted, template!(Word), experimental!(panic_runtime)),
|
||||
gated!(needs_panic_runtime, Whitelisted, template!(Word), experimental!(needs_panic_runtime)),
|
||||
gated!(
|
||||
unwind, Whitelisted, template!(List: "allowed|aborts"), unwind_attributes,
|
||||
experimental!(unwind),
|
||||
),
|
||||
gated!(
|
||||
compiler_builtins, Whitelisted, template!(Word),
|
||||
"the `#[compiler_builtins]` attribute is used to identify the `compiler_builtins` crate \
|
||||
which contains compiler-rt intrinsics and will never be stable",
|
||||
),
|
||||
gated!(
|
||||
sanitizer_runtime, Whitelisted, template!(Word),
|
||||
"the `#[sanitizer_runtime]` attribute is used to identify crates that contain the runtime \
|
||||
of a sanitizer and will never be stable",
|
||||
),
|
||||
gated!(
|
||||
profiler_runtime, Whitelisted, template!(Word),
|
||||
"the `#[profiler_runtime]` attribute is used to identify the `profiler_builtins` crate \
|
||||
which contains the profiler runtime and will never be stable",
|
||||
),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes, Linkage:
|
||||
// ==========================================================================
|
||||
|
||||
gated!(
|
||||
linkage, Whitelisted, template!(NameValueStr: "external|internal|..."),
|
||||
"the `linkage` attribute is experimental and not portable across platforms",
|
||||
),
|
||||
rustc_attr!(rustc_std_internal_symbol, Whitelisted, template!(Word), INTERAL_UNSTABLE),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes, Macro related:
|
||||
// ==========================================================================
|
||||
|
||||
rustc_attr!(rustc_builtin_macro, Whitelisted, template!(Word), IMPL_DETAIL),
|
||||
rustc_attr!(rustc_proc_macro_decls, Normal, template!(Word), INTERAL_UNSTABLE),
|
||||
rustc_attr!(
|
||||
rustc_macro_transparency, Whitelisted,
|
||||
template!(NameValueStr: "transparent|semitransparent|opaque"),
|
||||
"used internally for testing macro hygiene",
|
||||
),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes, Diagnostics related:
|
||||
// ==========================================================================
|
||||
|
||||
gated!(
|
||||
rustc_on_unimplemented, Whitelisted,
|
||||
template!(
|
||||
List: r#"/*opt*/ message = "...", /*opt*/ label = "...", /*opt*/ note = "...""#,
|
||||
NameValueStr: "message"
|
||||
),
|
||||
on_unimplemented,
|
||||
experimental!(rustc_on_unimplemented),
|
||||
),
|
||||
// Whitelists "identity-like" conversion methods to suggest on type mismatch.
|
||||
rustc_attr!(rustc_conversion_suggestion, Whitelisted, template!(Word), INTERAL_UNSTABLE),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes, Const related:
|
||||
// ==========================================================================
|
||||
|
||||
rustc_attr!(rustc_promotable, Whitelisted, template!(Word), IMPL_DETAIL),
|
||||
rustc_attr!(rustc_allow_const_fn_ptr, Whitelisted, template!(Word), IMPL_DETAIL),
|
||||
rustc_attr!(rustc_args_required_const, Whitelisted, template!(List: "N"), INTERAL_UNSTABLE),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes, Layout related:
|
||||
// ==========================================================================
|
||||
|
||||
rustc_attr!(
|
||||
rustc_layout_scalar_valid_range_start, Whitelisted, template!(List: "value"),
|
||||
"the `#[rustc_layout_scalar_valid_range_start]` attribute is just used to enable \
|
||||
niche optimizations in libcore and will never be stable",
|
||||
),
|
||||
rustc_attr!(
|
||||
rustc_layout_scalar_valid_range_end, Whitelisted, template!(List: "value"),
|
||||
"the `#[rustc_layout_scalar_valid_range_end]` attribute is just used to enable \
|
||||
niche optimizations in libcore and will never be stable",
|
||||
),
|
||||
rustc_attr!(
|
||||
rustc_nonnull_optimization_guaranteed, Whitelisted, template!(Word),
|
||||
"the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to enable \
|
||||
niche optimizations in libcore and will never be stable",
|
||||
),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes, Misc:
|
||||
// ==========================================================================
|
||||
|
||||
gated!(
|
||||
lang, Normal, template!(NameValueStr: "name"), lang_items,
|
||||
"language items are subject to change",
|
||||
),
|
||||
(
|
||||
sym::no_debug, Whitelisted, template!(Word),
|
||||
Gated(
|
||||
Stability::Deprecated("https://github.com/rust-lang/rust/issues/29721", None),
|
||||
sym::no_debug,
|
||||
"the `#[no_debug]` attribute was an experimental feature that has been \
|
||||
deprecated due to lack of demand",
|
||||
cfg_fn!(no_debug)
|
||||
)
|
||||
),
|
||||
gated!(
|
||||
// Used in resolve:
|
||||
prelude_import, Whitelisted, template!(Word),
|
||||
"`#[prelude_import]` is for use by rustc only",
|
||||
),
|
||||
gated!(
|
||||
rustc_paren_sugar, Normal, template!(Word), unboxed_closures,
|
||||
"unboxed_closures are still evolving",
|
||||
),
|
||||
rustc_attr!(
|
||||
rustc_inherit_overflow_checks, Whitelisted, template!(Word),
|
||||
"the `#[rustc_inherit_overflow_checks]` attribute is just used to control \
|
||||
overflow checking behavior of several libcore functions that are inlined \
|
||||
across crates and will never be stable",
|
||||
),
|
||||
rustc_attr!(
|
||||
rustc_test_marker, Normal, template!(Word),
|
||||
"the `#[rustc_test_marker]` attribute is used internally to track tests",
|
||||
),
|
||||
|
||||
// ==========================================================================
|
||||
// Internal attributes, Testing:
|
||||
// ==========================================================================
|
||||
|
||||
rustc_attr!(TEST, rustc_outlives, Normal, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_variance, Normal, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_layout, Normal, template!(List: "field1, field2, ...")),
|
||||
rustc_attr!(TEST, rustc_regions, Normal, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_error, Whitelisted, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_dump_user_substs, Whitelisted, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_if_this_changed, Whitelisted, template!(Word, List: "DepNode")),
|
||||
rustc_attr!(TEST, rustc_then_this_would_need, Whitelisted, template!(List: "DepNode")),
|
||||
rustc_attr!(
|
||||
TEST, rustc_dirty, Whitelisted,
|
||||
template!(List: r#"cfg = "...", /*opt*/ label = "...", /*opt*/ except = "...""#),
|
||||
),
|
||||
rustc_attr!(
|
||||
TEST, rustc_clean, Whitelisted,
|
||||
template!(List: r#"cfg = "...", /*opt*/ label = "...", /*opt*/ except = "...""#),
|
||||
),
|
||||
rustc_attr!(
|
||||
TEST, rustc_partition_reused, Whitelisted,
|
||||
template!(List: r#"cfg = "...", module = "...""#),
|
||||
),
|
||||
rustc_attr!(
|
||||
TEST, rustc_partition_codegened, Whitelisted,
|
||||
template!(List: r#"cfg = "...", module = "...""#),
|
||||
),
|
||||
rustc_attr!(
|
||||
TEST, rustc_expected_cgu_reuse, Whitelisted,
|
||||
template!(List: r#"cfg = "...", module = "...", kind = "...""#),
|
||||
),
|
||||
rustc_attr!(TEST, rustc_synthetic, Whitelisted, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_symbol_name, Whitelisted, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_def_path, Whitelisted, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_mir, Whitelisted, template!(List: "arg1, arg2, ...")),
|
||||
rustc_attr!(TEST, rustc_dump_program_clauses, Whitelisted, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_dump_env_program_clauses, Whitelisted, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_object_lifetime_default, Whitelisted, template!(Word)),
|
||||
rustc_attr!(TEST, rustc_dummy, Normal, template!(Word /* doesn't matter*/)),
|
||||
gated!(
|
||||
omit_gdb_pretty_printer_section, Whitelisted, template!(Word),
|
||||
"the `#[omit_gdb_pretty_printer_section]` attribute is just used for the Rust test suite",
|
||||
),
|
||||
];
|
||||
|
||||
pub fn deprecated_attributes() -> Vec<&'static BuiltinAttribute> {
|
||||
BUILTIN_ATTRIBUTES.iter().filter(|(.., gate)| gate.is_deprecated()).collect()
|
||||
}
|
||||
|
||||
pub fn is_builtin_attr_name(name: ast::Name) -> bool {
|
||||
BUILTIN_ATTRIBUTE_MAP.get(&name).is_some()
|
||||
}
|
||||
|
||||
pub fn is_builtin_attr(attr: &ast::Attribute) -> bool {
|
||||
attr.ident().and_then(|ident| BUILTIN_ATTRIBUTE_MAP.get(&ident.name)).is_some()
|
||||
}
|
||||
|
||||
lazy_static! {
|
||||
pub static ref BUILTIN_ATTRIBUTE_MAP: FxHashMap<Symbol, &'static BuiltinAttribute> = {
|
||||
let mut map = FxHashMap::default();
|
||||
for attr in BUILTIN_ATTRIBUTES.iter() {
|
||||
if map.insert(attr.0, attr).is_some() {
|
||||
panic!("duplicate builtin attribute `{}`", attr.0);
|
||||
}
|
||||
}
|
||||
map
|
||||
};
|
||||
}
|
||||
951
src/libsyntax/feature_gate/check.rs
Normal file
951
src/libsyntax/feature_gate/check.rs
Normal file
@ -0,0 +1,951 @@
|
||||
use super::active::{ACTIVE_FEATURES, Features};
|
||||
use super::accepted::ACCEPTED_FEATURES;
|
||||
use super::removed::{REMOVED_FEATURES, STABLE_REMOVED_FEATURES};
|
||||
use super::builtin_attrs::{AttributeGate, AttributeType, BuiltinAttribute, BUILTIN_ATTRIBUTE_MAP};
|
||||
|
||||
use crate::ast::{
|
||||
self, AssocTyConstraint, AssocTyConstraintKind, NodeId, GenericParam, GenericParamKind,
|
||||
PatKind, RangeEnd,
|
||||
};
|
||||
use crate::attr::{self, check_builtin_attribute};
|
||||
use crate::source_map::Spanned;
|
||||
use crate::edition::{ALL_EDITIONS, Edition};
|
||||
use crate::visit::{self, FnKind, Visitor};
|
||||
use crate::parse::{token, ParseSess};
|
||||
use crate::parse::parser::Parser;
|
||||
use crate::symbol::{Symbol, sym};
|
||||
use crate::tokenstream::TokenTree;
|
||||
|
||||
use errors::{Applicability, DiagnosticBuilder, Handler};
|
||||
use rustc_data_structures::fx::FxHashMap;
|
||||
use rustc_target::spec::abi::Abi;
|
||||
use syntax_pos::{Span, DUMMY_SP, MultiSpan};
|
||||
use log::debug;
|
||||
|
||||
use std::env;
|
||||
|
||||
#[derive(Copy, Clone, Debug)]
|
||||
pub enum Stability {
|
||||
Unstable,
|
||||
// First argument is tracking issue link; second argument is an optional
|
||||
// help message, which defaults to "remove this attribute"
|
||||
Deprecated(&'static str, Option<&'static str>),
|
||||
}
|
||||
|
||||
struct Context<'a> {
|
||||
features: &'a Features,
|
||||
parse_sess: &'a ParseSess,
|
||||
plugin_attributes: &'a [(Symbol, AttributeType)],
|
||||
}
|
||||
|
||||
macro_rules! gate_feature_fn {
|
||||
($cx: expr, $has_feature: expr, $span: expr, $name: expr, $explain: expr, $level: expr) => {{
|
||||
let (cx, has_feature, span,
|
||||
name, explain, level) = ($cx, $has_feature, $span, $name, $explain, $level);
|
||||
let has_feature: bool = has_feature(&$cx.features);
|
||||
debug!("gate_feature(feature = {:?}, span = {:?}); has? {}", name, span, has_feature);
|
||||
if !has_feature && !span.allows_unstable($name) {
|
||||
leveled_feature_err(cx.parse_sess, name, span, GateIssue::Language, explain, level)
|
||||
.emit();
|
||||
}
|
||||
}}
|
||||
}
|
||||
|
||||
macro_rules! gate_feature {
|
||||
($cx: expr, $feature: ident, $span: expr, $explain: expr) => {
|
||||
gate_feature_fn!($cx, |x:&Features| x.$feature, $span,
|
||||
sym::$feature, $explain, GateStrength::Hard)
|
||||
};
|
||||
($cx: expr, $feature: ident, $span: expr, $explain: expr, $level: expr) => {
|
||||
gate_feature_fn!($cx, |x:&Features| x.$feature, $span,
|
||||
sym::$feature, $explain, $level)
|
||||
};
|
||||
}
|
||||
|
||||
impl<'a> Context<'a> {
|
||||
fn check_attribute(
|
||||
&self,
|
||||
attr: &ast::Attribute,
|
||||
attr_info: Option<&BuiltinAttribute>,
|
||||
is_macro: bool
|
||||
) {
|
||||
debug!("check_attribute(attr = {:?})", attr);
|
||||
if let Some(&(name, ty, _template, ref gateage)) = attr_info {
|
||||
if let AttributeGate::Gated(_, name, desc, ref has_feature) = *gateage {
|
||||
if !attr.span.allows_unstable(name) {
|
||||
gate_feature_fn!(
|
||||
self, has_feature, attr.span, name, desc, GateStrength::Hard
|
||||
);
|
||||
}
|
||||
} else if name == sym::doc {
|
||||
if let Some(content) = attr.meta_item_list() {
|
||||
if content.iter().any(|c| c.check_name(sym::include)) {
|
||||
gate_feature!(self, external_doc, attr.span,
|
||||
"`#[doc(include = \"...\")]` is experimental"
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
debug!("check_attribute: {:?} is builtin, {:?}, {:?}", attr.path, ty, gateage);
|
||||
return;
|
||||
} else {
|
||||
for segment in &attr.path.segments {
|
||||
if segment.ident.as_str().starts_with("rustc") {
|
||||
let msg = "attributes starting with `rustc` are \
|
||||
reserved for use by the `rustc` compiler";
|
||||
gate_feature!(self, rustc_attrs, segment.ident.span, msg);
|
||||
}
|
||||
}
|
||||
}
|
||||
for &(n, ty) in self.plugin_attributes {
|
||||
if attr.path == n {
|
||||
// Plugins can't gate attributes, so we don't check for it
|
||||
// unlike the code above; we only use this loop to
|
||||
// short-circuit to avoid the checks below.
|
||||
debug!("check_attribute: {:?} is registered by a plugin, {:?}", attr.path, ty);
|
||||
return;
|
||||
}
|
||||
}
|
||||
if !is_macro && !attr::is_known(attr) {
|
||||
// Only run the custom attribute lint during regular feature gate
|
||||
// checking. Macro gating runs before the plugin attributes are
|
||||
// registered, so we skip this in that case.
|
||||
let msg = format!("the attribute `{}` is currently unknown to the compiler and \
|
||||
may have meaning added to it in the future", attr.path);
|
||||
gate_feature!(self, custom_attribute, attr.span, &msg);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn check_attribute(attr: &ast::Attribute, parse_sess: &ParseSess, features: &Features) {
|
||||
let cx = Context { features, parse_sess, plugin_attributes: &[] };
|
||||
cx.check_attribute(
|
||||
attr,
|
||||
attr.ident().and_then(|ident| BUILTIN_ATTRIBUTE_MAP.get(&ident.name).map(|a| *a)),
|
||||
true
|
||||
);
|
||||
}
|
||||
|
||||
fn find_lang_feature_issue(feature: Symbol) -> Option<u32> {
|
||||
if let Some(info) = ACTIVE_FEATURES.iter().find(|t| t.0 == feature) {
|
||||
let issue = info.2;
|
||||
// FIXME (#28244): enforce that active features have issue numbers
|
||||
// assert!(issue.is_some())
|
||||
issue
|
||||
} else {
|
||||
// search in Accepted, Removed, or Stable Removed features
|
||||
let found = ACCEPTED_FEATURES.iter().chain(REMOVED_FEATURES).chain(STABLE_REMOVED_FEATURES)
|
||||
.find(|t| t.0 == feature);
|
||||
match found {
|
||||
Some(&(_, _, issue, _)) => issue,
|
||||
None => panic!("Feature `{}` is not declared anywhere", feature),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub enum GateIssue {
|
||||
Language,
|
||||
Library(Option<u32>)
|
||||
}
|
||||
|
||||
#[derive(Debug, Copy, Clone, PartialEq)]
|
||||
pub enum GateStrength {
|
||||
/// A hard error. (Most feature gates should use this.)
|
||||
Hard,
|
||||
/// Only a warning. (Use this only as backwards-compatibility demands.)
|
||||
Soft,
|
||||
}
|
||||
|
||||
pub fn emit_feature_err(
|
||||
sess: &ParseSess,
|
||||
feature: Symbol,
|
||||
span: Span,
|
||||
issue: GateIssue,
|
||||
explain: &str,
|
||||
) {
|
||||
feature_err(sess, feature, span, issue, explain).emit();
|
||||
}
|
||||
|
||||
pub fn feature_err<'a, S: Into<MultiSpan>>(
|
||||
sess: &'a ParseSess,
|
||||
feature: Symbol,
|
||||
span: S,
|
||||
issue: GateIssue,
|
||||
explain: &str,
|
||||
) -> DiagnosticBuilder<'a> {
|
||||
leveled_feature_err(sess, feature, span, issue, explain, GateStrength::Hard)
|
||||
}
|
||||
|
||||
fn leveled_feature_err<'a, S: Into<MultiSpan>>(
|
||||
sess: &'a ParseSess,
|
||||
feature: Symbol,
|
||||
span: S,
|
||||
issue: GateIssue,
|
||||
explain: &str,
|
||||
level: GateStrength,
|
||||
) -> DiagnosticBuilder<'a> {
|
||||
let diag = &sess.span_diagnostic;
|
||||
|
||||
let issue = match issue {
|
||||
GateIssue::Language => find_lang_feature_issue(feature),
|
||||
GateIssue::Library(lib) => lib,
|
||||
};
|
||||
|
||||
let mut err = match level {
|
||||
GateStrength::Hard => {
|
||||
diag.struct_span_err_with_code(span, explain, stringify_error_code!(E0658))
|
||||
}
|
||||
GateStrength::Soft => diag.struct_span_warn(span, explain),
|
||||
};
|
||||
|
||||
match issue {
|
||||
None | Some(0) => {} // We still accept `0` as a stand-in for backwards compatibility
|
||||
Some(n) => {
|
||||
err.note(&format!(
|
||||
"for more information, see https://github.com/rust-lang/rust/issues/{}",
|
||||
n,
|
||||
));
|
||||
}
|
||||
}
|
||||
|
||||
// #23973: do not suggest `#![feature(...)]` if we are in beta/stable
|
||||
if sess.unstable_features.is_nightly_build() {
|
||||
err.help(&format!("add `#![feature({})]` to the crate attributes to enable", feature));
|
||||
}
|
||||
|
||||
// If we're on stable and only emitting a "soft" warning, add a note to
|
||||
// clarify that the feature isn't "on" (rather than being on but
|
||||
// warning-worthy).
|
||||
if !sess.unstable_features.is_nightly_build() && level == GateStrength::Soft {
|
||||
err.help("a nightly build of the compiler is required to enable this feature");
|
||||
}
|
||||
|
||||
err
|
||||
|
||||
}
|
||||
|
||||
const EXPLAIN_BOX_SYNTAX: &str =
|
||||
"box expression syntax is experimental; you can call `Box::new` instead";
|
||||
|
||||
pub const EXPLAIN_STMT_ATTR_SYNTAX: &str =
|
||||
"attributes on expressions are experimental";
|
||||
|
||||
pub const EXPLAIN_ALLOW_INTERNAL_UNSTABLE: &str =
|
||||
"allow_internal_unstable side-steps feature gating and stability checks";
|
||||
pub const EXPLAIN_ALLOW_INTERNAL_UNSAFE: &str =
|
||||
"allow_internal_unsafe side-steps the unsafe_code lint";
|
||||
|
||||
pub const EXPLAIN_UNSIZED_TUPLE_COERCION: &str =
|
||||
"unsized tuple coercion is not stable enough for use and is subject to change";
|
||||
|
||||
struct PostExpansionVisitor<'a> {
|
||||
context: &'a Context<'a>,
|
||||
builtin_attributes: &'static FxHashMap<Symbol, &'static BuiltinAttribute>,
|
||||
}
|
||||
|
||||
macro_rules! gate_feature_post {
|
||||
($cx: expr, $feature: ident, $span: expr, $explain: expr) => {{
|
||||
let (cx, span) = ($cx, $span);
|
||||
if !span.allows_unstable(sym::$feature) {
|
||||
gate_feature!(cx.context, $feature, span, $explain)
|
||||
}
|
||||
}};
|
||||
($cx: expr, $feature: ident, $span: expr, $explain: expr, $level: expr) => {{
|
||||
let (cx, span) = ($cx, $span);
|
||||
if !span.allows_unstable(sym::$feature) {
|
||||
gate_feature!(cx.context, $feature, span, $explain, $level)
|
||||
}
|
||||
}}
|
||||
}
|
||||
|
||||
impl<'a> PostExpansionVisitor<'a> {
|
||||
fn check_abi(&self, abi: Abi, span: Span) {
|
||||
match abi {
|
||||
Abi::RustIntrinsic => {
|
||||
gate_feature_post!(&self, intrinsics, span,
|
||||
"intrinsics are subject to change");
|
||||
},
|
||||
Abi::PlatformIntrinsic => {
|
||||
gate_feature_post!(&self, platform_intrinsics, span,
|
||||
"platform intrinsics are experimental and possibly buggy");
|
||||
},
|
||||
Abi::Vectorcall => {
|
||||
gate_feature_post!(&self, abi_vectorcall, span,
|
||||
"vectorcall is experimental and subject to change");
|
||||
},
|
||||
Abi::Thiscall => {
|
||||
gate_feature_post!(&self, abi_thiscall, span,
|
||||
"thiscall is experimental and subject to change");
|
||||
},
|
||||
Abi::RustCall => {
|
||||
gate_feature_post!(&self, unboxed_closures, span,
|
||||
"rust-call ABI is subject to change");
|
||||
},
|
||||
Abi::PtxKernel => {
|
||||
gate_feature_post!(&self, abi_ptx, span,
|
||||
"PTX ABIs are experimental and subject to change");
|
||||
},
|
||||
Abi::Unadjusted => {
|
||||
gate_feature_post!(&self, abi_unadjusted, span,
|
||||
"unadjusted ABI is an implementation detail and perma-unstable");
|
||||
},
|
||||
Abi::Msp430Interrupt => {
|
||||
gate_feature_post!(&self, abi_msp430_interrupt, span,
|
||||
"msp430-interrupt ABI is experimental and subject to change");
|
||||
},
|
||||
Abi::X86Interrupt => {
|
||||
gate_feature_post!(&self, abi_x86_interrupt, span,
|
||||
"x86-interrupt ABI is experimental and subject to change");
|
||||
},
|
||||
Abi::AmdGpuKernel => {
|
||||
gate_feature_post!(&self, abi_amdgpu_kernel, span,
|
||||
"amdgpu-kernel ABI is experimental and subject to change");
|
||||
},
|
||||
// Stable
|
||||
Abi::Cdecl |
|
||||
Abi::Stdcall |
|
||||
Abi::Fastcall |
|
||||
Abi::Aapcs |
|
||||
Abi::Win64 |
|
||||
Abi::SysV64 |
|
||||
Abi::Rust |
|
||||
Abi::C |
|
||||
Abi::System => {}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
|
||||
fn visit_attribute(&mut self, attr: &ast::Attribute) {
|
||||
let attr_info = attr.ident().and_then(|ident| {
|
||||
self.builtin_attributes.get(&ident.name).map(|a| *a)
|
||||
});
|
||||
|
||||
// Check for gated attributes.
|
||||
self.context.check_attribute(attr, attr_info, false);
|
||||
|
||||
if attr.check_name(sym::doc) {
|
||||
if let Some(content) = attr.meta_item_list() {
|
||||
if content.len() == 1 && content[0].check_name(sym::cfg) {
|
||||
gate_feature_post!(&self, doc_cfg, attr.span,
|
||||
"`#[doc(cfg(...))]` is experimental"
|
||||
);
|
||||
} else if content.iter().any(|c| c.check_name(sym::masked)) {
|
||||
gate_feature_post!(&self, doc_masked, attr.span,
|
||||
"`#[doc(masked)]` is experimental"
|
||||
);
|
||||
} else if content.iter().any(|c| c.check_name(sym::spotlight)) {
|
||||
gate_feature_post!(&self, doc_spotlight, attr.span,
|
||||
"`#[doc(spotlight)]` is experimental"
|
||||
);
|
||||
} else if content.iter().any(|c| c.check_name(sym::alias)) {
|
||||
gate_feature_post!(&self, doc_alias, attr.span,
|
||||
"`#[doc(alias = \"...\")]` is experimental"
|
||||
);
|
||||
} else if content.iter().any(|c| c.check_name(sym::keyword)) {
|
||||
gate_feature_post!(&self, doc_keyword, attr.span,
|
||||
"`#[doc(keyword = \"...\")]` is experimental"
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
match attr_info {
|
||||
// `rustc_dummy` doesn't have any restrictions specific to built-in attributes.
|
||||
Some(&(name, _, template, _)) if name != sym::rustc_dummy =>
|
||||
check_builtin_attribute(self.context.parse_sess, attr, name, template),
|
||||
_ => if let Some(TokenTree::Token(token)) = attr.tokens.trees().next() {
|
||||
if token == token::Eq {
|
||||
// All key-value attributes are restricted to meta-item syntax.
|
||||
attr.parse_meta(self.context.parse_sess).map_err(|mut err| err.emit()).ok();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn visit_name(&mut self, sp: Span, name: ast::Name) {
|
||||
if !name.as_str().is_ascii() {
|
||||
gate_feature_post!(
|
||||
&self,
|
||||
non_ascii_idents,
|
||||
self.context.parse_sess.source_map().def_span(sp),
|
||||
"non-ascii idents are not fully supported"
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
fn visit_item(&mut self, i: &'a ast::Item) {
|
||||
match i.node {
|
||||
ast::ItemKind::ForeignMod(ref foreign_module) => {
|
||||
self.check_abi(foreign_module.abi, i.span);
|
||||
}
|
||||
|
||||
ast::ItemKind::Fn(..) => {
|
||||
if attr::contains_name(&i.attrs[..], sym::plugin_registrar) {
|
||||
gate_feature_post!(&self, plugin_registrar, i.span,
|
||||
"compiler plugins are experimental and possibly buggy");
|
||||
}
|
||||
if attr::contains_name(&i.attrs[..], sym::start) {
|
||||
gate_feature_post!(&self, start, i.span,
|
||||
"a `#[start]` function is an experimental \
|
||||
feature whose signature may change \
|
||||
over time");
|
||||
}
|
||||
if attr::contains_name(&i.attrs[..], sym::main) {
|
||||
gate_feature_post!(&self, main, i.span,
|
||||
"declaration of a non-standard `#[main]` \
|
||||
function may change over time, for now \
|
||||
a top-level `fn main()` is required");
|
||||
}
|
||||
}
|
||||
|
||||
ast::ItemKind::Struct(..) => {
|
||||
for attr in attr::filter_by_name(&i.attrs[..], sym::repr) {
|
||||
for item in attr.meta_item_list().unwrap_or_else(Vec::new) {
|
||||
if item.check_name(sym::simd) {
|
||||
gate_feature_post!(&self, repr_simd, attr.span,
|
||||
"SIMD types are experimental and possibly buggy");
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
ast::ItemKind::Enum(ast::EnumDef{ref variants, ..}, ..) => {
|
||||
for variant in variants {
|
||||
match (&variant.data, &variant.disr_expr) {
|
||||
(ast::VariantData::Unit(..), _) => {},
|
||||
(_, Some(disr_expr)) =>
|
||||
gate_feature_post!(
|
||||
&self,
|
||||
arbitrary_enum_discriminant,
|
||||
disr_expr.value.span,
|
||||
"discriminants on non-unit variants are experimental"),
|
||||
_ => {},
|
||||
}
|
||||
}
|
||||
|
||||
let has_feature = self.context.features.arbitrary_enum_discriminant;
|
||||
if !has_feature && !i.span.allows_unstable(sym::arbitrary_enum_discriminant) {
|
||||
Parser::maybe_report_invalid_custom_discriminants(
|
||||
self.context.parse_sess,
|
||||
&variants,
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
ast::ItemKind::Impl(_, polarity, defaultness, ..) => {
|
||||
if polarity == ast::ImplPolarity::Negative {
|
||||
gate_feature_post!(&self, optin_builtin_traits,
|
||||
i.span,
|
||||
"negative trait bounds are not yet fully implemented; \
|
||||
use marker types for now");
|
||||
}
|
||||
|
||||
if let ast::Defaultness::Default = defaultness {
|
||||
gate_feature_post!(&self, specialization,
|
||||
i.span,
|
||||
"specialization is unstable");
|
||||
}
|
||||
}
|
||||
|
||||
ast::ItemKind::Trait(ast::IsAuto::Yes, ..) => {
|
||||
gate_feature_post!(&self, optin_builtin_traits,
|
||||
i.span,
|
||||
"auto traits are experimental and possibly buggy");
|
||||
}
|
||||
|
||||
ast::ItemKind::TraitAlias(..) => {
|
||||
gate_feature_post!(
|
||||
&self,
|
||||
trait_alias,
|
||||
i.span,
|
||||
"trait aliases are experimental"
|
||||
);
|
||||
}
|
||||
|
||||
ast::ItemKind::MacroDef(ast::MacroDef { legacy: false, .. }) => {
|
||||
let msg = "`macro` is experimental";
|
||||
gate_feature_post!(&self, decl_macro, i.span, msg);
|
||||
}
|
||||
|
||||
ast::ItemKind::OpaqueTy(..) => {
|
||||
gate_feature_post!(
|
||||
&self,
|
||||
type_alias_impl_trait,
|
||||
i.span,
|
||||
"`impl Trait` in type aliases is unstable"
|
||||
);
|
||||
}
|
||||
|
||||
_ => {}
|
||||
}
|
||||
|
||||
visit::walk_item(self, i);
|
||||
}
|
||||
|
||||
fn visit_foreign_item(&mut self, i: &'a ast::ForeignItem) {
|
||||
match i.node {
|
||||
ast::ForeignItemKind::Fn(..) |
|
||||
ast::ForeignItemKind::Static(..) => {
|
||||
let link_name = attr::first_attr_value_str_by_name(&i.attrs, sym::link_name);
|
||||
let links_to_llvm = match link_name {
|
||||
Some(val) => val.as_str().starts_with("llvm."),
|
||||
_ => false
|
||||
};
|
||||
if links_to_llvm {
|
||||
gate_feature_post!(&self, link_llvm_intrinsics, i.span,
|
||||
"linking to LLVM intrinsics is experimental");
|
||||
}
|
||||
}
|
||||
ast::ForeignItemKind::Ty => {
|
||||
gate_feature_post!(&self, extern_types, i.span,
|
||||
"extern types are experimental");
|
||||
}
|
||||
ast::ForeignItemKind::Macro(..) => {}
|
||||
}
|
||||
|
||||
visit::walk_foreign_item(self, i)
|
||||
}
|
||||
|
||||
fn visit_ty(&mut self, ty: &'a ast::Ty) {
|
||||
match ty.node {
|
||||
ast::TyKind::BareFn(ref bare_fn_ty) => {
|
||||
self.check_abi(bare_fn_ty.abi, ty.span);
|
||||
}
|
||||
ast::TyKind::Never => {
|
||||
gate_feature_post!(&self, never_type, ty.span,
|
||||
"The `!` type is experimental");
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
visit::walk_ty(self, ty)
|
||||
}
|
||||
|
||||
fn visit_fn_ret_ty(&mut self, ret_ty: &'a ast::FunctionRetTy) {
|
||||
if let ast::FunctionRetTy::Ty(ref output_ty) = *ret_ty {
|
||||
if let ast::TyKind::Never = output_ty.node {
|
||||
// Do nothing.
|
||||
} else {
|
||||
self.visit_ty(output_ty)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn visit_expr(&mut self, e: &'a ast::Expr) {
|
||||
match e.node {
|
||||
ast::ExprKind::Box(_) => {
|
||||
gate_feature_post!(&self, box_syntax, e.span, EXPLAIN_BOX_SYNTAX);
|
||||
}
|
||||
ast::ExprKind::Type(..) => {
|
||||
// To avoid noise about type ascription in common syntax errors, only emit if it
|
||||
// is the *only* error.
|
||||
if self.context.parse_sess.span_diagnostic.err_count() == 0 {
|
||||
gate_feature_post!(&self, type_ascription, e.span,
|
||||
"type ascription is experimental");
|
||||
}
|
||||
}
|
||||
ast::ExprKind::TryBlock(_) => {
|
||||
gate_feature_post!(&self, try_blocks, e.span, "`try` expression is experimental");
|
||||
}
|
||||
ast::ExprKind::Block(_, opt_label) => {
|
||||
if let Some(label) = opt_label {
|
||||
gate_feature_post!(&self, label_break_value, label.ident.span,
|
||||
"labels on blocks are unstable");
|
||||
}
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
visit::walk_expr(self, e)
|
||||
}
|
||||
|
||||
fn visit_arm(&mut self, arm: &'a ast::Arm) {
|
||||
visit::walk_arm(self, arm)
|
||||
}
|
||||
|
||||
fn visit_pat(&mut self, pattern: &'a ast::Pat) {
|
||||
match &pattern.node {
|
||||
PatKind::Slice(pats) => {
|
||||
for pat in &*pats {
|
||||
let span = pat.span;
|
||||
let inner_pat = match &pat.node {
|
||||
PatKind::Ident(.., Some(pat)) => pat,
|
||||
_ => pat,
|
||||
};
|
||||
if inner_pat.is_rest() {
|
||||
gate_feature_post!(
|
||||
&self,
|
||||
slice_patterns,
|
||||
span,
|
||||
"subslice patterns are unstable"
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
PatKind::Box(..) => {
|
||||
gate_feature_post!(&self, box_patterns,
|
||||
pattern.span,
|
||||
"box pattern syntax is experimental");
|
||||
}
|
||||
PatKind::Range(_, _, Spanned { node: RangeEnd::Excluded, .. }) => {
|
||||
gate_feature_post!(&self, exclusive_range_pattern, pattern.span,
|
||||
"exclusive range pattern syntax is experimental");
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
visit::walk_pat(self, pattern)
|
||||
}
|
||||
|
||||
fn visit_fn(&mut self,
|
||||
fn_kind: FnKind<'a>,
|
||||
fn_decl: &'a ast::FnDecl,
|
||||
span: Span,
|
||||
_node_id: NodeId) {
|
||||
if let Some(header) = fn_kind.header() {
|
||||
// Stability of const fn methods are covered in
|
||||
// `visit_trait_item` and `visit_impl_item` below; this is
|
||||
// because default methods don't pass through this point.
|
||||
self.check_abi(header.abi, span);
|
||||
}
|
||||
|
||||
if fn_decl.c_variadic {
|
||||
gate_feature_post!(&self, c_variadic, span, "C-variadic functions are unstable");
|
||||
}
|
||||
|
||||
visit::walk_fn(self, fn_kind, fn_decl, span)
|
||||
}
|
||||
|
||||
fn visit_generic_param(&mut self, param: &'a GenericParam) {
|
||||
match param.kind {
|
||||
GenericParamKind::Const { .. } =>
|
||||
gate_feature_post!(&self, const_generics, param.ident.span,
|
||||
"const generics are unstable"),
|
||||
_ => {}
|
||||
}
|
||||
visit::walk_generic_param(self, param)
|
||||
}
|
||||
|
||||
fn visit_assoc_ty_constraint(&mut self, constraint: &'a AssocTyConstraint) {
|
||||
match constraint.kind {
|
||||
AssocTyConstraintKind::Bound { .. } =>
|
||||
gate_feature_post!(&self, associated_type_bounds, constraint.span,
|
||||
"associated type bounds are unstable"),
|
||||
_ => {}
|
||||
}
|
||||
visit::walk_assoc_ty_constraint(self, constraint)
|
||||
}
|
||||
|
||||
fn visit_trait_item(&mut self, ti: &'a ast::TraitItem) {
|
||||
match ti.node {
|
||||
ast::TraitItemKind::Method(ref sig, ref block) => {
|
||||
if block.is_none() {
|
||||
self.check_abi(sig.header.abi, ti.span);
|
||||
}
|
||||
if sig.decl.c_variadic {
|
||||
gate_feature_post!(&self, c_variadic, ti.span,
|
||||
"C-variadic functions are unstable");
|
||||
}
|
||||
if sig.header.constness.node == ast::Constness::Const {
|
||||
gate_feature_post!(&self, const_fn, ti.span, "const fn is unstable");
|
||||
}
|
||||
}
|
||||
ast::TraitItemKind::Type(_, ref default) => {
|
||||
// We use three if statements instead of something like match guards so that all
|
||||
// of these errors can be emitted if all cases apply.
|
||||
if default.is_some() {
|
||||
gate_feature_post!(&self, associated_type_defaults, ti.span,
|
||||
"associated type defaults are unstable");
|
||||
}
|
||||
if !ti.generics.params.is_empty() {
|
||||
gate_feature_post!(&self, generic_associated_types, ti.span,
|
||||
"generic associated types are unstable");
|
||||
}
|
||||
if !ti.generics.where_clause.predicates.is_empty() {
|
||||
gate_feature_post!(&self, generic_associated_types, ti.span,
|
||||
"where clauses on associated types are unstable");
|
||||
}
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
visit::walk_trait_item(self, ti)
|
||||
}
|
||||
|
||||
fn visit_impl_item(&mut self, ii: &'a ast::ImplItem) {
|
||||
if ii.defaultness == ast::Defaultness::Default {
|
||||
gate_feature_post!(&self, specialization,
|
||||
ii.span,
|
||||
"specialization is unstable");
|
||||
}
|
||||
|
||||
match ii.node {
|
||||
ast::ImplItemKind::Method(..) => {}
|
||||
ast::ImplItemKind::OpaqueTy(..) => {
|
||||
gate_feature_post!(
|
||||
&self,
|
||||
type_alias_impl_trait,
|
||||
ii.span,
|
||||
"`impl Trait` in type aliases is unstable"
|
||||
);
|
||||
}
|
||||
ast::ImplItemKind::TyAlias(_) => {
|
||||
if !ii.generics.params.is_empty() {
|
||||
gate_feature_post!(&self, generic_associated_types, ii.span,
|
||||
"generic associated types are unstable");
|
||||
}
|
||||
if !ii.generics.where_clause.predicates.is_empty() {
|
||||
gate_feature_post!(&self, generic_associated_types, ii.span,
|
||||
"where clauses on associated types are unstable");
|
||||
}
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
visit::walk_impl_item(self, ii)
|
||||
}
|
||||
|
||||
fn visit_vis(&mut self, vis: &'a ast::Visibility) {
|
||||
if let ast::VisibilityKind::Crate(ast::CrateSugar::JustCrate) = vis.node {
|
||||
gate_feature_post!(&self, crate_visibility_modifier, vis.span,
|
||||
"`crate` visibility modifier is experimental");
|
||||
}
|
||||
visit::walk_vis(self, vis)
|
||||
}
|
||||
}
|
||||
|
||||
pub fn get_features(span_handler: &Handler, krate_attrs: &[ast::Attribute],
|
||||
crate_edition: Edition, allow_features: &Option<Vec<String>>) -> Features {
|
||||
fn feature_removed(span_handler: &Handler, span: Span, reason: Option<&str>) {
|
||||
let mut err = struct_span_err!(span_handler, span, E0557, "feature has been removed");
|
||||
if let Some(reason) = reason {
|
||||
err.span_note(span, reason);
|
||||
} else {
|
||||
err.span_label(span, "feature has been removed");
|
||||
}
|
||||
err.emit();
|
||||
}
|
||||
|
||||
let mut features = Features::new();
|
||||
let mut edition_enabled_features = FxHashMap::default();
|
||||
|
||||
for &edition in ALL_EDITIONS {
|
||||
if edition <= crate_edition {
|
||||
// The `crate_edition` implies its respective umbrella feature-gate
|
||||
// (i.e., `#![feature(rust_20XX_preview)]` isn't needed on edition 20XX).
|
||||
edition_enabled_features.insert(edition.feature_name(), edition);
|
||||
}
|
||||
}
|
||||
|
||||
for &(name, .., f_edition, set) in ACTIVE_FEATURES {
|
||||
if let Some(f_edition) = f_edition {
|
||||
if f_edition <= crate_edition {
|
||||
set(&mut features, DUMMY_SP);
|
||||
edition_enabled_features.insert(name, crate_edition);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Process the edition umbrella feature-gates first, to ensure
|
||||
// `edition_enabled_features` is completed before it's queried.
|
||||
for attr in krate_attrs {
|
||||
if !attr.check_name(sym::feature) {
|
||||
continue
|
||||
}
|
||||
|
||||
let list = match attr.meta_item_list() {
|
||||
Some(list) => list,
|
||||
None => continue,
|
||||
};
|
||||
|
||||
for mi in list {
|
||||
if !mi.is_word() {
|
||||
continue;
|
||||
}
|
||||
|
||||
let name = mi.name_or_empty();
|
||||
|
||||
if let Some(edition) = ALL_EDITIONS.iter().find(|e| name == e.feature_name()) {
|
||||
if *edition <= crate_edition {
|
||||
continue;
|
||||
}
|
||||
|
||||
for &(name, .., f_edition, set) in ACTIVE_FEATURES {
|
||||
if let Some(f_edition) = f_edition {
|
||||
if f_edition <= *edition {
|
||||
// FIXME(Manishearth) there is currently no way to set
|
||||
// lib features by edition
|
||||
set(&mut features, DUMMY_SP);
|
||||
edition_enabled_features.insert(name, *edition);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
for attr in krate_attrs {
|
||||
if !attr.check_name(sym::feature) {
|
||||
continue
|
||||
}
|
||||
|
||||
let list = match attr.meta_item_list() {
|
||||
Some(list) => list,
|
||||
None => continue,
|
||||
};
|
||||
|
||||
let bad_input = |span| {
|
||||
struct_span_err!(span_handler, span, E0556, "malformed `feature` attribute input")
|
||||
};
|
||||
|
||||
for mi in list {
|
||||
let name = match mi.ident() {
|
||||
Some(ident) if mi.is_word() => ident.name,
|
||||
Some(ident) => {
|
||||
bad_input(mi.span()).span_suggestion(
|
||||
mi.span(),
|
||||
"expected just one word",
|
||||
format!("{}", ident.name),
|
||||
Applicability::MaybeIncorrect,
|
||||
).emit();
|
||||
continue
|
||||
}
|
||||
None => {
|
||||
bad_input(mi.span()).span_label(mi.span(), "expected just one word").emit();
|
||||
continue
|
||||
}
|
||||
};
|
||||
|
||||
if let Some(edition) = edition_enabled_features.get(&name) {
|
||||
struct_span_warn!(
|
||||
span_handler,
|
||||
mi.span(),
|
||||
E0705,
|
||||
"the feature `{}` is included in the Rust {} edition",
|
||||
name,
|
||||
edition,
|
||||
).emit();
|
||||
continue;
|
||||
}
|
||||
|
||||
if ALL_EDITIONS.iter().any(|e| name == e.feature_name()) {
|
||||
// Handled in the separate loop above.
|
||||
continue;
|
||||
}
|
||||
|
||||
let removed = REMOVED_FEATURES.iter().find(|f| name == f.0);
|
||||
let stable_removed = STABLE_REMOVED_FEATURES.iter().find(|f| name == f.0);
|
||||
if let Some((.., reason)) = removed.or(stable_removed) {
|
||||
feature_removed(span_handler, mi.span(), *reason);
|
||||
continue;
|
||||
}
|
||||
|
||||
if let Some((_, since, ..)) = ACCEPTED_FEATURES.iter().find(|f| name == f.0) {
|
||||
let since = Some(Symbol::intern(since));
|
||||
features.declared_lang_features.push((name, mi.span(), since));
|
||||
continue;
|
||||
}
|
||||
|
||||
if let Some(allowed) = allow_features.as_ref() {
|
||||
if allowed.iter().find(|f| *f == name.as_str()).is_none() {
|
||||
span_err!(span_handler, mi.span(), E0725,
|
||||
"the feature `{}` is not in the list of allowed features",
|
||||
name);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
if let Some((.., set)) = ACTIVE_FEATURES.iter().find(|f| name == f.0) {
|
||||
set(&mut features, mi.span());
|
||||
features.declared_lang_features.push((name, mi.span(), None));
|
||||
continue;
|
||||
}
|
||||
|
||||
features.declared_lib_features.push((name, mi.span()));
|
||||
}
|
||||
}
|
||||
|
||||
features
|
||||
}
|
||||
|
||||
pub fn check_crate(krate: &ast::Crate,
|
||||
sess: &ParseSess,
|
||||
features: &Features,
|
||||
plugin_attributes: &[(Symbol, AttributeType)],
|
||||
unstable: UnstableFeatures) {
|
||||
maybe_stage_features(&sess.span_diagnostic, krate, unstable);
|
||||
let ctx = Context {
|
||||
features,
|
||||
parse_sess: sess,
|
||||
plugin_attributes,
|
||||
};
|
||||
|
||||
macro_rules! gate_all {
|
||||
($gate:ident, $msg:literal) => { gate_all!($gate, $gate, $msg); };
|
||||
($spans:ident, $gate:ident, $msg:literal) => {
|
||||
for span in &*sess.gated_spans.$spans.borrow() {
|
||||
gate_feature!(&ctx, $gate, *span, $msg);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
gate_all!(param_attrs, "attributes on function parameters are unstable");
|
||||
gate_all!(let_chains, "`let` expressions in this position are experimental");
|
||||
gate_all!(async_closure, "async closures are unstable");
|
||||
gate_all!(yields, generators, "yield syntax is experimental");
|
||||
gate_all!(or_patterns, "or-patterns syntax is experimental");
|
||||
|
||||
let visitor = &mut PostExpansionVisitor {
|
||||
context: &ctx,
|
||||
builtin_attributes: &*BUILTIN_ATTRIBUTE_MAP,
|
||||
};
|
||||
visit::walk_crate(visitor, krate);
|
||||
}
|
||||
|
||||
#[derive(Clone, Copy, Hash)]
|
||||
pub enum UnstableFeatures {
|
||||
/// Hard errors for unstable features are active, as on beta/stable channels.
|
||||
Disallow,
|
||||
/// Allow features to be activated, as on nightly.
|
||||
Allow,
|
||||
/// Errors are bypassed for bootstrapping. This is required any time
|
||||
/// during the build that feature-related lints are set to warn or above
|
||||
/// because the build turns on warnings-as-errors and uses lots of unstable
|
||||
/// features. As a result, this is always required for building Rust itself.
|
||||
Cheat
|
||||
}
|
||||
|
||||
impl UnstableFeatures {
|
||||
pub fn from_environment() -> UnstableFeatures {
|
||||
// Whether this is a feature-staged build, i.e., on the beta or stable channel
|
||||
let disable_unstable_features = option_env!("CFG_DISABLE_UNSTABLE_FEATURES").is_some();
|
||||
// Whether we should enable unstable features for bootstrapping
|
||||
let bootstrap = env::var("RUSTC_BOOTSTRAP").is_ok();
|
||||
match (disable_unstable_features, bootstrap) {
|
||||
(_, true) => UnstableFeatures::Cheat,
|
||||
(true, _) => UnstableFeatures::Disallow,
|
||||
(false, _) => UnstableFeatures::Allow
|
||||
}
|
||||
}
|
||||
|
||||
pub fn is_nightly_build(&self) -> bool {
|
||||
match *self {
|
||||
UnstableFeatures::Allow | UnstableFeatures::Cheat => true,
|
||||
_ => false,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn maybe_stage_features(span_handler: &Handler, krate: &ast::Crate, unstable: UnstableFeatures) {
|
||||
let allow_features = match unstable {
|
||||
UnstableFeatures::Allow => true,
|
||||
UnstableFeatures::Disallow => false,
|
||||
UnstableFeatures::Cheat => true
|
||||
};
|
||||
if !allow_features {
|
||||
for attr in &krate.attrs {
|
||||
if attr.check_name(sym::feature) {
|
||||
let release_channel = option_env!("CFG_RELEASE_CHANNEL").unwrap_or("(unknown)");
|
||||
span_err!(span_handler, attr.span, E0554,
|
||||
"`#![feature]` may not be used on the {} release channel",
|
||||
release_channel);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
31
src/libsyntax/feature_gate/mod.rs
Normal file
31
src/libsyntax/feature_gate/mod.rs
Normal file
@ -0,0 +1,31 @@
|
||||
//! # Feature gating
|
||||
//!
|
||||
//! This module implements the gating necessary for preventing certain compiler
|
||||
//! features from being used by default. This module will crawl a pre-expanded
|
||||
//! AST to ensure that there are no features which are used that are not
|
||||
//! enabled.
|
||||
//!
|
||||
//! Features are enabled in programs via the crate-level attributes of
|
||||
//! `#![feature(...)]` with a comma-separated list of features.
|
||||
//!
|
||||
//! For the purpose of future feature-tracking, once code for detection of feature
|
||||
//! gate usage is added, *do not remove it again* even once the feature
|
||||
//! becomes stable.
|
||||
|
||||
mod accepted;
|
||||
mod removed;
|
||||
mod active;
|
||||
mod builtin_attrs;
|
||||
mod check;
|
||||
|
||||
pub use active::{Features, INCOMPLETE_FEATURES};
|
||||
pub use builtin_attrs::{
|
||||
AttributeGate, AttributeType, GatedCfg,
|
||||
BuiltinAttribute, BUILTIN_ATTRIBUTES, BUILTIN_ATTRIBUTE_MAP,
|
||||
deprecated_attributes, is_builtin_attr, is_builtin_attr_name,
|
||||
};
|
||||
pub use check::{
|
||||
check_attribute, check_crate, get_features, feature_err, emit_feature_err,
|
||||
Stability, GateIssue, UnstableFeatures,
|
||||
EXPLAIN_STMT_ATTR_SYNTAX, EXPLAIN_UNSIZED_TUPLE_COERCION,
|
||||
};
|
||||
82
src/libsyntax/feature_gate/removed.rs
Normal file
82
src/libsyntax/feature_gate/removed.rs
Normal file
@ -0,0 +1,82 @@
|
||||
//! List of the removed feature gates.
|
||||
|
||||
use crate::symbol::{Symbol, sym};
|
||||
|
||||
macro_rules! declare_features {
|
||||
($((removed, $feature: ident, $ver: expr, $issue: expr, None, $reason: expr),)+) => {
|
||||
/// Represents unstable features which have since been removed (it was once Active)
|
||||
pub const REMOVED_FEATURES: &[(Symbol, &str, Option<u32>, Option<&str>)] = &[
|
||||
$((sym::$feature, $ver, $issue, $reason)),+
|
||||
];
|
||||
};
|
||||
|
||||
($((stable_removed, $feature: ident, $ver: expr, $issue: expr, None),)+) => {
|
||||
/// Represents stable features which have since been removed (it was once Accepted)
|
||||
pub const STABLE_REMOVED_FEATURES: &[(Symbol, &str, Option<u32>, Option<&str>)] = &[
|
||||
$((sym::$feature, $ver, $issue, None)),+
|
||||
];
|
||||
};
|
||||
}
|
||||
|
||||
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`")),
|
||||
(removed, pushpop_unsafe, "1.2.0", None, None, None),
|
||||
(removed, needs_allocator, "1.4.0", Some(27389), None,
|
||||
Some("subsumed by `#![feature(allocator_internals)]`")),
|
||||
(removed, proc_macro_mod, "1.27.0", Some(54727), None,
|
||||
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
|
||||
(removed, proc_macro_expr, "1.27.0", Some(54727), None,
|
||||
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
|
||||
(removed, proc_macro_non_items, "1.27.0", Some(54727), None,
|
||||
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
|
||||
(removed, proc_macro_gen, "1.27.0", Some(54727), None,
|
||||
Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
|
||||
(removed, panic_implementation, "1.28.0", Some(44489), None,
|
||||
Some("subsumed by `#[panic_handler]`")),
|
||||
// Allows the use of `#[derive(Anything)]` as sugar for `#[derive_Anything]`.
|
||||
(removed, custom_derive, "1.32.0", Some(29644), None,
|
||||
Some("subsumed by `#[proc_macro_derive]`")),
|
||||
// Paths of the form: `extern::foo::bar`
|
||||
(removed, extern_in_paths, "1.33.0", Some(55600), None,
|
||||
Some("subsumed by `::foo::bar` paths")),
|
||||
(removed, quote, "1.33.0", Some(29601), None, None),
|
||||
// Allows using `#[unsafe_destructor_blind_to_params]` (RFC 1238).
|
||||
(removed, dropck_parametricity, "1.38.0", Some(28498), None, None),
|
||||
(removed, await_macro, "1.38.0", Some(50547), None,
|
||||
Some("subsumed by `.await` syntax")),
|
||||
// Allows defining `existential type`s.
|
||||
(removed, existential_type, "1.38.0", Some(63063), None,
|
||||
Some("removed in favor of `#![feature(type_alias_impl_trait)]`")),
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
// feature-group-end: removed features
|
||||
// -------------------------------------------------------------------------
|
||||
);
|
||||
|
||||
declare_features! (
|
||||
(stable_removed, no_stack_check, "1.0.0", None, None),
|
||||
);
|
||||
@ -3,6 +3,6 @@
|
||||
// compile-flags: --cfg broken
|
||||
|
||||
#![crate_type = "lib"]
|
||||
#![cfg_attr(broken, no_core)] //~ ERROR no_core is experimental
|
||||
#![cfg_attr(broken, no_core)] //~ ERROR the `#[no_core]` attribute is an experimental feature
|
||||
|
||||
pub struct S {}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: no_core is experimental
|
||||
error[E0658]: the `#[no_core]` attribute is an experimental feature
|
||||
--> $DIR/cfg-attr-crate-2.rs:6:21
|
||||
|
|
||||
LL | #![cfg_attr(broken, no_core)]
|
||||
|
||||
@ -1,6 +1,7 @@
|
||||
// compile-flags: --cfg broken
|
||||
|
||||
#![crate_type = "lib"]
|
||||
#![cfg_attr(broken, no_core, no_std)] //~ ERROR no_core is experimental
|
||||
#![cfg_attr(broken, no_core, no_std)]
|
||||
//~^ ERROR the `#[no_core]` attribute is an experimental feature
|
||||
|
||||
pub struct S {}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: no_core is experimental
|
||||
error[E0658]: the `#[no_core]` attribute is an experimental feature
|
||||
--> $DIR/cfg-attr-multi-invalid-1.rs:4:21
|
||||
|
|
||||
LL | #![cfg_attr(broken, no_core, no_std)]
|
||||
|
||||
@ -1,6 +1,7 @@
|
||||
// compile-flags: --cfg broken
|
||||
|
||||
#![crate_type = "lib"]
|
||||
#![cfg_attr(broken, no_std, no_core)] //~ ERROR no_core is experimental
|
||||
#![cfg_attr(broken, no_std, no_core)]
|
||||
//~^ ERROR the `#[no_core]` attribute is an experimental feature
|
||||
|
||||
pub struct S {}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: no_core is experimental
|
||||
error[E0658]: the `#[no_core]` attribute is an experimental feature
|
||||
--> $DIR/cfg-attr-multi-invalid-2.rs:4:29
|
||||
|
|
||||
LL | #![cfg_attr(broken, no_std, no_core)]
|
||||
|
||||
@ -1,17 +1,17 @@
|
||||
#![crate_type="rlib"]
|
||||
#![optimize(speed)] //~ ERROR `#[optimize]` attribute is an unstable feature
|
||||
#![optimize(speed)] //~ ERROR the `#[optimize]` attribute is an experimental feature
|
||||
|
||||
#[optimize(size)] //~ ERROR `#[optimize]` attribute is an unstable feature
|
||||
#[optimize(size)] //~ ERROR the `#[optimize]` attribute is an experimental feature
|
||||
mod module {
|
||||
|
||||
#[optimize(size)] //~ ERROR `#[optimize]` attribute is an unstable feature
|
||||
#[optimize(size)] //~ ERROR the `#[optimize]` attribute is an experimental feature
|
||||
fn size() {}
|
||||
|
||||
#[optimize(speed)] //~ ERROR `#[optimize]` attribute is an unstable feature
|
||||
#[optimize(speed)] //~ ERROR the `#[optimize]` attribute is an experimental feature
|
||||
fn speed() {}
|
||||
|
||||
#[optimize(banana)]
|
||||
//~^ ERROR `#[optimize]` attribute is an unstable feature
|
||||
//~^ ERROR the `#[optimize]` attribute is an experimental feature
|
||||
//~| ERROR E0722
|
||||
fn not_known() {}
|
||||
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: `#[optimize]` attribute is an unstable feature
|
||||
error[E0658]: the `#[optimize]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-optimize_attribute.rs:7:1
|
||||
|
|
||||
LL | #[optimize(size)]
|
||||
@ -7,7 +7,7 @@ LL | #[optimize(size)]
|
||||
= note: for more information, see https://github.com/rust-lang/rust/issues/54882
|
||||
= help: add `#![feature(optimize_attribute)]` to the crate attributes to enable
|
||||
|
||||
error[E0658]: `#[optimize]` attribute is an unstable feature
|
||||
error[E0658]: the `#[optimize]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-optimize_attribute.rs:10:1
|
||||
|
|
||||
LL | #[optimize(speed)]
|
||||
@ -16,7 +16,7 @@ LL | #[optimize(speed)]
|
||||
= note: for more information, see https://github.com/rust-lang/rust/issues/54882
|
||||
= help: add `#![feature(optimize_attribute)]` to the crate attributes to enable
|
||||
|
||||
error[E0658]: `#[optimize]` attribute is an unstable feature
|
||||
error[E0658]: the `#[optimize]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-optimize_attribute.rs:13:1
|
||||
|
|
||||
LL | #[optimize(banana)]
|
||||
@ -25,7 +25,7 @@ LL | #[optimize(banana)]
|
||||
= note: for more information, see https://github.com/rust-lang/rust/issues/54882
|
||||
= help: add `#![feature(optimize_attribute)]` to the crate attributes to enable
|
||||
|
||||
error[E0658]: `#[optimize]` attribute is an unstable feature
|
||||
error[E0658]: the `#[optimize]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-optimize_attribute.rs:4:1
|
||||
|
|
||||
LL | #[optimize(size)]
|
||||
@ -34,7 +34,7 @@ LL | #[optimize(size)]
|
||||
= note: for more information, see https://github.com/rust-lang/rust/issues/54882
|
||||
= help: add `#![feature(optimize_attribute)]` to the crate attributes to enable
|
||||
|
||||
error[E0658]: `#[optimize]` attribute is an unstable feature
|
||||
error[E0658]: the `#[optimize]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-optimize_attribute.rs:2:1
|
||||
|
|
||||
LL | #![optimize(speed)]
|
||||
|
||||
@ -5,7 +5,7 @@
|
||||
|
||||
use core::alloc::Layout;
|
||||
|
||||
#[alloc_error_handler] //~ ERROR `#[alloc_error_handler]` is an unstable feature
|
||||
#[alloc_error_handler] //~ ERROR the `#[alloc_error_handler]` attribute is an experimental feature
|
||||
fn oom(info: Layout) -> ! {
|
||||
loop {}
|
||||
}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: `#[alloc_error_handler]` is an unstable feature
|
||||
error[E0658]: the `#[alloc_error_handler]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-alloc-error-handler.rs:8:1
|
||||
|
|
||||
LL | #[alloc_error_handler]
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
// check that #[allow_fail] is feature-gated
|
||||
|
||||
#[allow_fail] //~ ERROR allow_fail attribute is currently unstable
|
||||
#[allow_fail] //~ ERROR the `#[allow_fail]` attribute is an experimental feature
|
||||
fn ok_to_fail() {
|
||||
assert!(false);
|
||||
}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: allow_fail attribute is currently unstable
|
||||
error[E0658]: the `#[allow_fail]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-allow_fail.rs:3:1
|
||||
|
|
||||
LL | #[allow_fail]
|
||||
|
||||
@ -1,7 +1,7 @@
|
||||
use std::fmt::{Debug, Display};
|
||||
|
||||
#[marker] trait ExplicitMarker {}
|
||||
//~^ ERROR marker traits is an experimental feature
|
||||
//~^ ERROR the `#[marker]` attribute is an experimental feature
|
||||
|
||||
impl<T: Display> ExplicitMarker for T {}
|
||||
impl<T: Debug> ExplicitMarker for T {}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: marker traits is an experimental feature
|
||||
error[E0658]: the `#[marker]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-marker_trait_attr.rs:3:1
|
||||
|
|
||||
LL | #[marker] trait ExplicitMarker {}
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
#![crate_type = "rlib"]
|
||||
|
||||
#![no_core] //~ ERROR no_core is experimental
|
||||
#![no_core] //~ ERROR the `#[no_core]` attribute is an experimental feature
|
||||
|
||||
pub struct S {}
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: no_core is experimental
|
||||
error[E0658]: the `#[no_core]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-no_core.rs:3:1
|
||||
|
|
||||
LL | #![no_core]
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
//#![feature(non_exhaustive)]
|
||||
|
||||
#[non_exhaustive] //~ERROR non exhaustive is an experimental feature
|
||||
#[non_exhaustive] //~ERROR the `#[non_exhaustive]` attribute is an experimental feature
|
||||
pub enum NonExhaustiveEnum {
|
||||
Unit,
|
||||
Tuple(u32),
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: non exhaustive is an experimental feature
|
||||
error[E0658]: the `#[non_exhaustive]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-non_exhaustive.rs:3:1
|
||||
|
|
||||
LL | #[non_exhaustive]
|
||||
|
||||
@ -16,7 +16,7 @@ fn f() {}
|
||||
fn g() {}
|
||||
|
||||
#[rustc_dummy]
|
||||
//~^ ERROR used by the test suite
|
||||
//~^ ERROR the `#[rustc_dummy]` attribute is just used for rustc unit tests
|
||||
#[rustc_unknown]
|
||||
//~^ ERROR attributes starting with `rustc` are reserved for use by the `rustc` compiler
|
||||
//~| ERROR cannot find attribute macro `rustc_unknown` in this scope
|
||||
|
||||
@ -43,7 +43,7 @@ error: cannot find attribute macro `rustc_unknown` in this scope
|
||||
LL | #[rustc_unknown]
|
||||
| ^^^^^^^^^^^^^
|
||||
|
||||
error[E0658]: used by the test suite
|
||||
error[E0658]: the `#[rustc_dummy]` attribute is just used for rustc unit tests and will never be stable
|
||||
--> $DIR/feature-gate-rustc-attrs.rs:18:1
|
||||
|
|
||||
LL | #[rustc_dummy]
|
||||
|
||||
@ -8,7 +8,7 @@ extern {
|
||||
fn extern_fn();
|
||||
// CHECK-NOT: Function Attrs: nounwind
|
||||
// CHECK: declare void @unwinding_extern_fn
|
||||
#[unwind(allowed)] //~ ERROR `#[unwind]` is experimental
|
||||
#[unwind(allowed)] //~ ERROR the `#[unwind]` attribute is an experimental feature
|
||||
fn unwinding_extern_fn();
|
||||
}
|
||||
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
error[E0658]: `#[unwind]` is experimental
|
||||
error[E0658]: the `#[unwind]` attribute is an experimental feature
|
||||
--> $DIR/feature-gate-unwind-attributes.rs:11:5
|
||||
|
|
||||
LL | #[unwind(allowed)]
|
||||
|
||||
@ -26,8 +26,7 @@ LL | #[inline = ""]
|
||||
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
|
||||
= note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
|
||||
|
||||
warning: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...",
|
||||
/*opt*/ cfg = "...")]`
|
||||
warning: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ cfg = "...")]`
|
||||
--> $DIR/malformed-regressions.rs:6:1
|
||||
|
|
||||
LL | #[link]
|
||||
@ -36,8 +35,7 @@ LL | #[link]
|
||||
= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
|
||||
= note: for more information, see issue #57571 <https://github.com/rust-lang/rust/issues/57571>
|
||||
|
||||
warning: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...",
|
||||
/*opt*/ cfg = "...")]`
|
||||
warning: attribute must be of the form `#[link(name = "...", /*opt*/ kind = "dylib|static|...", /*opt*/ cfg = "...")]`
|
||||
--> $DIR/malformed-regressions.rs:7:1
|
||||
|
|
||||
LL | #[link = ""]
|
||||
|
||||
@ -221,7 +221,14 @@ fn test_filen_gate(filen_underscore: &str, features: &mut Features) -> bool {
|
||||
}
|
||||
|
||||
pub fn collect_lang_features(base_src_path: &Path, bad: &mut bool) -> Features {
|
||||
let contents = t!(fs::read_to_string(base_src_path.join("libsyntax/feature_gate.rs")));
|
||||
let mut all = collect_lang_features_in(base_src_path, "active.rs", bad);
|
||||
all.extend(collect_lang_features_in(base_src_path, "accepted.rs", bad));
|
||||
all.extend(collect_lang_features_in(base_src_path, "removed.rs", bad));
|
||||
all
|
||||
}
|
||||
|
||||
fn collect_lang_features_in(base: &Path, file: &str, bad: &mut bool) -> Features {
|
||||
let contents = t!(fs::read_to_string(base.join("libsyntax/feature_gate").join(file)));
|
||||
|
||||
// We allow rustc-internal features to omit a tracking issue.
|
||||
// To make tidy accept omitting a tracking issue, group the list of features
|
||||
|
||||
Loading…
Reference in New Issue
Block a user