compiler/rustc_feature/src/removed.rs

   1 //! List of the removed feature gates.
   2
   3 use super::{to_nonzero, Feature, State};
   4 use rustc_span::symbol::sym;
   5
   6 macro_rules! declare_features {
   7     ($(
   8         $(#[doc = $doc:tt])* (removed, $feature:ident, $ver:expr, $issue:expr, None, $reason:expr),
   9     )+) => {
  10         /// Represents unstable features which have since been removed (it was once Active)
  11         pub const REMOVED_FEATURES: &[Feature] = &[
  12             $(
  13                 Feature {
  14                     state: State::Removed { reason: $reason },
  15                     name: sym::$feature,
  16                     since: $ver,
  17                     issue: to_nonzero($issue),
  18                     edition: None,
  19                     description: concat!($($doc,)*),
  20                 }
  21             ),+
  22         ];
  23     };
  24
  25     ($(
  26         $(#[doc = $doc:tt])* (stable_removed, $feature:ident, $ver:expr, $issue:expr, None),
  27     )+) => {
  28         /// Represents stable features which have since been removed (it was once Accepted)
  29         pub const STABLE_REMOVED_FEATURES: &[Feature] = &[
  30             $(
  31                 Feature {
  32                     state: State::Stabilized { reason: None },
  33                     name: sym::$feature,
  34                     since: $ver,
  35                     issue: to_nonzero($issue),
  36                     edition: None,
  37                     description: concat!($($doc,)*),
  38                 }
  39             ),+
  40         ];
  41     };
  42 }
  43
  44 #[rustfmt::skip]
  45 declare_features! (
  46     // -------------------------------------------------------------------------
  47     // feature-group-start: removed features
  48     // -------------------------------------------------------------------------
  49
  50     (removed, import_shadowing, "1.0.0", None, None, None),
  51     (removed, managed_boxes, "1.0.0", None, None, None),
  52     /// Allows use of unary negate on unsigned integers, e.g., -e for e: u8
  53     (removed, negate_unsigned, "1.0.0", Some(29645), None, None),
  54     (removed, reflect, "1.0.0", Some(27749), None, None),
  55     /// A way to temporarily opt out of opt in copy. This will *never* be accepted.
  56     (removed, opt_out_copy, "1.0.0", None, None, None),
  57     (removed, quad_precision_float, "1.0.0", None, None, None),
  58     (removed, struct_inherit, "1.0.0", None, None, None),
  59     (removed, test_removed_feature, "1.0.0", None, None, None),
  60     (removed, visible_private_types, "1.0.0", None, None, None),
  61     (removed, unsafe_no_drop_flag, "1.0.0", None, None, None),
  62     /// Allows using items which are missing stability attributes
  63     (removed, unmarked_api, "1.0.0", None, None, None),
  64     (removed, allocator, "1.0.0", None, None, None),
  65     (removed, simd, "1.0.0", Some(27731), None,
  66      Some("removed in favor of `#[repr(simd)]`")),
  67     (removed, advanced_slice_patterns, "1.0.0", Some(62254), None,
  68      Some("merged into `#![feature(slice_patterns)]`")),
  69     (removed, macro_reexport, "1.0.0", Some(29638), None,
  70      Some("subsumed by `pub use`")),
  71     /// Allows using custom attributes (RFC 572).
  72     (removed, custom_attribute, "1.0.0", Some(29642), None,
  73      Some("removed in favor of `#![register_tool]` and `#![register_attr]`")),
  74     (removed, pushpop_unsafe, "1.2.0", None, None, None),
  75     (removed, needs_allocator, "1.4.0", Some(27389), None,
  76      Some("subsumed by `#![feature(allocator_internals)]`")),
  77     /// Allows identifying crates that contain sanitizer runtimes.
  78     (removed, sanitizer_runtime, "1.17.0", None, None, None),
  79     (removed, proc_macro_mod, "1.27.0", Some(54727), None,
  80      Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
  81     (removed, proc_macro_expr, "1.27.0", Some(54727), None,
  82      Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
  83     (removed, proc_macro_non_items, "1.27.0", Some(54727), None,
  84      Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
  85     (removed, proc_macro_gen, "1.27.0", Some(54727), None,
  86      Some("subsumed by `#![feature(proc_macro_hygiene)]`")),
  87     (removed, panic_implementation, "1.28.0", Some(44489), None,
  88      Some("subsumed by `#[panic_handler]`")),
  89     /// Allows the use of `#[derive(Anything)]` as sugar for `#[derive_Anything]`.
  90     (removed, custom_derive, "1.32.0", Some(29644), None,
  91      Some("subsumed by `#[proc_macro_derive]`")),
  92     /// Paths of the form: `extern::foo::bar`
  93     (removed, extern_in_paths, "1.33.0", Some(55600), None,
  94      Some("subsumed by `::foo::bar` paths")),
  95     (removed, quote, "1.33.0", Some(29601), None, None),
  96     /// Allows using `#[unsafe_destructor_blind_to_params]` (RFC 1238).
  97     (removed, dropck_parametricity, "1.38.0", Some(28498), None, None),
  98     (removed, await_macro, "1.38.0", Some(50547), None,
  99      Some("subsumed by `.await` syntax")),
 100     /// Allows defining `existential type`s.
 101     (removed, existential_type, "1.38.0", Some(63063), None,
 102      Some("removed in favor of `#![feature(type_alias_impl_trait)]`")),
 103     /// Allows using the macros:
 104     /// + `__diagnostic_used`
 105     /// + `__register_diagnostic`
 106     /// +`__build_diagnostic_array`
 107     (removed, rustc_diagnostic_macros, "1.38.0", None, None, None),
 108     /// Allows using `#[on_unimplemented(..)]` on traits.
 109     /// (Moved to `rustc_attrs`.)
 110     (removed, on_unimplemented, "1.40.0", None, None, None),
 111     /// Allows overlapping impls of marker traits.
 112     (removed, overlapping_marker_traits, "1.42.0", Some(29864), None,
 113      Some("removed in favor of `#![feature(marker_trait_attr)]`")),
 114     /// Allows `#[no_debug]`.
 115     (removed, no_debug, "1.43.0", Some(29721), None, Some("removed due to lack of demand")),
 116
 117     /// Allows comparing raw pointers during const eval.
 118     (removed, const_compare_raw_pointers, "1.46.0", Some(53020), None,
 119      Some("cannot be allowed in const eval in any meaningful way")),
 120
 121     // -------------------------------------------------------------------------
 122     // feature-group-end: removed features
 123     // -------------------------------------------------------------------------
 124 );
 125
 126 #[rustfmt::skip]
 127 declare_features! (
 128     (stable_removed, no_stack_check, "1.0.0", None, None),
 129 );