diff options
Diffstat (limited to 'compiler/rustc_feature/src/removed.rs')
| -rw-r--r-- | compiler/rustc_feature/src/removed.rs | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/compiler/rustc_feature/src/removed.rs b/compiler/rustc_feature/src/removed.rs new file mode 100644 index 000000000..2ddaf9201 --- /dev/null +++ b/compiler/rustc_feature/src/removed.rs @@ -0,0 +1,203 @@ +//! List of the removed feature gates. + +use super::{to_nonzero, Feature, State}; +use rustc_span::symbol::sym; + +macro_rules! declare_features { + ($( + $(#[doc = $doc:tt])* (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: &[Feature] = &[ + $( + Feature { + state: State::Removed { reason: $reason }, + name: sym::$feature, + since: $ver, + issue: to_nonzero($issue), + edition: None, + } + ),+ + ]; + }; + + ($( + $(#[doc = $doc:tt])* (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: &[Feature] = &[ + $( + Feature { + state: State::Stabilized { reason: None }, + name: sym::$feature, + since: $ver, + issue: to_nonzero($issue), + edition: None, + } + ),+ + ]; + }; +} + +#[rustfmt::skip] +declare_features! ( + // ------------------------------------------------------------------------- + // feature-group-start: removed features + // ------------------------------------------------------------------------- + + (removed, advanced_slice_patterns, "1.0.0", Some(62254), None, + Some("merged into `#![feature(slice_patterns)]`")), + (removed, allocator, "1.0.0", None, None, None), + /// Allows a test to fail without failing the whole suite. + (removed, allow_fail, "1.19.0", Some(46488), None, Some("removed due to no clear use cases")), + (removed, await_macro, "1.38.0", Some(50547), None, + Some("subsumed by `.await` syntax")), + /// Allows comparing raw pointers during const eval. + (removed, const_compare_raw_pointers, "1.46.0", Some(53020), None, + Some("cannot be allowed in const eval in any meaningful way")), + /// Allows non-trivial generic constants which have to be manually propagated upwards. + (removed, const_evaluatable_checked, "1.48.0", Some(76560), None, Some("renamed to `generic_const_exprs`")), + /// Allows the definition of `const` functions with some advanced features. + (removed, const_fn, "1.54.0", Some(57563), None, + Some("split into finer-grained feature gates")), + /// Allows const generic types (e.g. `struct Foo<const N: usize>(...);`). + (removed, const_generics, "1.34.0", Some(44580), None, + Some("removed in favor of `#![feature(adt_const_params)]` and `#![feature(generic_const_exprs)]`")), + /// Allows `[x; N]` where `x` is a constant (RFC 2203). + (removed, const_in_array_repeat_expressions, "1.37.0", Some(49147), None, + Some("removed due to causing promotable bugs")), + /// Allows casting raw pointers to `usize` during const eval. + (removed, const_raw_ptr_to_usize_cast, "1.55.0", Some(51910), None, + Some("at compile-time, pointers do not have an integer value, so these casts cannot be properly supported")), + /// Allows `T: ?const Trait` syntax in bounds. + (removed, const_trait_bound_opt_out, "1.42.0", Some(67794), None, + Some("Removed in favor of `~const` bound in #![feature(const_trait_impl)]")), + /// Allows using `crate` as visibility modifier, synonymous with `pub(crate)`. + (removed, crate_visibility_modifier, "1.63.0", Some(53120), None, Some("removed in favor of `pub(crate)`")), + /// Allows using custom attributes (RFC 572). + (removed, custom_attribute, "1.0.0", Some(29642), None, + Some("removed in favor of `#![register_tool]` and `#![register_attr]`")), + /// Allows the use of `#[derive(Anything)]` as sugar for `#[derive_Anything]`. + (removed, custom_derive, "1.32.0", Some(29644), None, + Some("subsumed by `#[proc_macro_derive]`")), + /// Allows using `#[doc(keyword = "...")]`. + (removed, doc_keyword, "1.28.0", Some(51315), None, + Some("merged into `#![feature(rustdoc_internals)]`")), + /// Allows using `doc(primitive)` without a future-incompat warning. + (removed, doc_primitive, "1.56.0", Some(88070), None, + Some("merged into `#![feature(rustdoc_internals)]`")), + /// Allows `#[doc(spotlight)]`. + /// The attribute was renamed to `#[doc(notable_trait)]` + /// and the feature to `doc_notable_trait`. + (removed, doc_spotlight, "1.22.0", Some(45040), None, + Some("renamed to `doc_notable_trait`")), + /// Allows using `#[unsafe_destructor_blind_to_params]` (RFC 1238). + (removed, dropck_parametricity, "1.38.0", Some(28498), None, None), + /// Allows defining `existential type`s. + (removed, existential_type, "1.38.0", Some(63063), None, + Some("removed in favor of `#![feature(type_alias_impl_trait)]`")), + /// Paths of the form: `extern::foo::bar` + (removed, extern_in_paths, "1.33.0", Some(55600), None, + Some("subsumed by `::foo::bar` paths")), + /// Allows `#[doc(include = "some-file")]`. + (removed, external_doc, "1.54.0", Some(44732), None, + Some("use #[doc = include_str!(\"filename\")] instead, which handles macro invocations")), + /// Allows `impl Trait` in bindings (`let`, `const`, `static`). + (removed, impl_trait_in_bindings, "1.55.0", Some(63065), None, + Some("the implementation was not maintainable, the feature may get reintroduced once the current refactorings are done")), + (removed, import_shadowing, "1.0.0", None, None, None), + /// Allows in-band quantification of lifetime bindings (e.g., `fn foo(x: &'a u8) -> &'a u8`). + (removed, in_band_lifetimes, "1.23.0", Some(44524), None, + Some("removed due to unsolved ergonomic questions and added lifetime resolution complexity")), + /// Allows inferring `'static` outlives requirements (RFC 2093). + (removed, infer_static_outlives_requirements, "1.63.0", Some(54185), None, + Some("removed as it caused some confusion and discussion was inactive for years")), + /// Lazily evaluate constants. This allows constants to depend on type parameters. + (removed, lazy_normalization_consts, "1.46.0", Some(72219), None, Some("superseded by `generic_const_exprs`")), + /// Allows using the `#[link_args]` attribute. + (removed, link_args, "1.53.0", Some(29596), None, + Some("removed in favor of using `-C link-arg=ARG` on command line, \ + which is available from cargo build scripts with `cargo:rustc-link-arg` now")), + (removed, macro_reexport, "1.0.0", Some(29638), None, + Some("subsumed by `pub use`")), + /// Allows using `#[main]` to replace the entrypoint `#[lang = "start"]` calls. + (removed, main, "1.53.0", Some(29634), None, None), + (removed, managed_boxes, "1.0.0", None, None, None), + /// Allows the use of type alias impl trait in function return positions + (removed, min_type_alias_impl_trait, "1.56.0", Some(63063), None, + Some("removed in favor of full type_alias_impl_trait")), + (removed, needs_allocator, "1.4.0", Some(27389), None, + Some("subsumed by `#![feature(allocator_internals)]`")), + /// Allows use of unary negate on unsigned integers, e.g., -e for e: u8 + (removed, negate_unsigned, "1.0.0", Some(29645), None, None), + /// Allows `#[no_debug]`. + (removed, no_debug, "1.43.0", Some(29721), None, Some("removed due to lack of demand")), + /// Allows using `#[on_unimplemented(..)]` on traits. + /// (Moved to `rustc_attrs`.) + (removed, on_unimplemented, "1.40.0", None, None, None), + /// A way to temporarily opt out of opt in copy. This will *never* be accepted. + (removed, opt_out_copy, "1.0.0", None, None, None), + /// Allows features specific to OIBIT (now called auto traits). + /// Renamed to `auto_traits`. + (removed, optin_builtin_traits, "1.0.0", Some(13231), None, + Some("renamed to `auto_traits`")), + /// Allows overlapping impls of marker traits. + (removed, overlapping_marker_traits, "1.42.0", Some(29864), None, + Some("removed in favor of `#![feature(marker_trait_attr)]`")), + (removed, panic_implementation, "1.28.0", Some(44489), None, + Some("subsumed by `#[panic_handler]`")), + /// Allows using `#[plugin_registrar]` on functions. + (removed, plugin_registrar, "1.54.0", Some(29597), None, + Some("a __rustc_plugin_registrar symbol must now be defined instead")), + (removed, proc_macro_expr, "1.27.0", Some(54727), None, + Some("subsumed by `#![feature(proc_macro_hygiene)]`")), + (removed, proc_macro_gen, "1.27.0", Some(54727), None, + Some("subsumed by `#![feature(proc_macro_hygiene)]`")), + (removed, proc_macro_mod, "1.27.0", Some(54727), None, + Some("subsumed by `#![feature(proc_macro_hygiene)]`")), + (removed, proc_macro_non_items, "1.27.0", Some(54727), None, + Some("subsumed by `#![feature(proc_macro_hygiene)]`")), + (removed, pub_macro_rules, "1.53.0", Some(78855), None, + Some("removed due to being incomplete, in particular it does not work across crates")), + (removed, pushpop_unsafe, "1.2.0", None, None, None), + (removed, quad_precision_float, "1.0.0", None, None, None), + (removed, quote, "1.33.0", Some(29601), None, None), + (removed, reflect, "1.0.0", Some(27749), None, None), + /// Allows using the macros: + /// + `__diagnostic_used` + /// + `__register_diagnostic` + /// +`__build_diagnostic_array` + (removed, rustc_diagnostic_macros, "1.38.0", None, None, None), + /// Allows identifying crates that contain sanitizer runtimes. + (removed, sanitizer_runtime, "1.17.0", None, None, None), + (removed, simd, "1.0.0", Some(27731), None, + Some("removed in favor of `#[repr(simd)]`")), + /// Allows `#[link(kind = "static-nobundle", ...)]`. + (removed, static_nobundle, "1.16.0", Some(37403), None, + Some(r#"subsumed by `#[link(kind = "static", modifiers = "-bundle", ...)]`"#)), + (removed, struct_inherit, "1.0.0", None, None, None), + (removed, test_removed_feature, "1.0.0", None, None, None), + /// Allows using items which are missing stability attributes + (removed, unmarked_api, "1.0.0", None, None, None), + (removed, unsafe_no_drop_flag, "1.0.0", None, None, None), + /// Allows `union` fields that don't implement `Copy` as long as they don't have any drop glue. + (removed, untagged_unions, "1.13.0", Some(55149), None, + Some("unions with `Copy` and `ManuallyDrop` fields are stable; there is no intent to stabilize more")), + /// Allows `#[unwind(..)]`. + /// + /// Permits specifying whether a function should permit unwinding or abort on unwind. + (removed, unwind_attributes, "1.56.0", Some(58760), None, Some("use the C-unwind ABI instead")), + (removed, visible_private_types, "1.0.0", None, None, None), + // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! + // Features are listed in alphabetical order. Tidy will fail if you don't keep it this way. + // !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! + + // ------------------------------------------------------------------------- + // feature-group-end: removed features + // ------------------------------------------------------------------------- +); + +#[rustfmt::skip] +declare_features! ( + (stable_removed, no_stack_check, "1.0.0", None, None), +); |