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removed.rs
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//! 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 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")),
/// 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)]`")),
(removed, struct_inherit, "1.0.0", None, None, None),
(removed, test_removed_feature, "1.0.0", None, None, None),
/// Allows using items which are missing stability attributes
(removed, unmarked_api, "1.0.0", None, None, None),
(removed, unsafe_no_drop_flag, "1.0.0", None, None, None),
/// Allows `#[unwind(..)]`.
///
/// Permits specifying whether a function should permit unwinding or abort on unwind.
(removed, unwind_attributes, "1.56.0", Some(58760), None, Some("use the C-unwind ABI instead")),
(removed, visible_private_types, "1.0.0", None, None, None),
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// Features are listed in alphabetical order. Tidy will fail if you don't keep it this way.
// !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!! !!!!
// -------------------------------------------------------------------------
// feature-group-end: removed features
// -------------------------------------------------------------------------
);
#[rustfmt::skip]
declare_features! (
(stable_removed, no_stack_check, "1.0.0", None, None),
);