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Merged
rust-bors merged 2 commits into from
Jan 22, 2026
Merged

Bump bootstrap compiler to 1.94 #151439

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bc611ce
Replace version placeholders with 1.94
Mark-Simulacrum Jan 19, 2026
3dc7a1f
Bump stage0
Mark-Simulacrum Jan 21, 2026
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1 change: 0 additions & 1 deletion compiler/rustc_ast/src/lib.rs
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Expand Up @@ -5,7 +5,6 @@
//! This API is completely unstable and subject to change.

// tidy-alphabetical-start
#![cfg_attr(bootstrap, feature(array_windows))]
#![doc(test(attr(deny(warnings), allow(internal_features))))]
#![feature(associated_type_defaults)]
#![feature(box_patterns)]
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1 change: 0 additions & 1 deletion compiler/rustc_data_structures/src/lib.rs
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Expand Up @@ -10,7 +10,6 @@
#![allow(internal_features)]
#![allow(rustc::default_hash_types)]
#![allow(rustc::potential_query_instability)]
#![cfg_attr(bootstrap, feature(array_windows))]
#![deny(unsafe_op_in_unsafe_fn)]
#![feature(allocator_api)]
#![feature(ascii_char)]
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1 change: 0 additions & 1 deletion compiler/rustc_errors/src/lib.rs
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Expand Up @@ -5,7 +5,6 @@
// tidy-alphabetical-start
#![allow(internal_features)]
#![allow(rustc::direct_use_of_rustc_type_ir)]
#![cfg_attr(bootstrap, feature(array_windows))]
#![feature(assert_matches)]
#![feature(associated_type_defaults)]
#![feature(box_patterns)]
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1 change: 0 additions & 1 deletion compiler/rustc_expand/src/lib.rs
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@@ -1,6 +1,5 @@
// tidy-alphabetical-start
#![allow(internal_features)]
#![cfg_attr(bootstrap, feature(array_windows))]
#![feature(associated_type_defaults)]
#![feature(if_let_guard)]
#![feature(macro_metavar_expr)]
Expand Down
4 changes: 2 additions & 2 deletions compiler/rustc_feature/src/removed.rs
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Expand Up @@ -61,7 +61,7 @@ declare_features! (
/// Allows a test to fail without failing the whole suite.
(removed, allow_fail, "1.60.0", Some(46488), Some("removed due to no clear use cases"), 93416),
/// Allows users to enforce equality of associated constants `TraitImpl<AssocConst=3>`.
(removed, associated_const_equality, "CURRENT_RUSTC_VERSION", Some(92827),
(removed, associated_const_equality, "1.94.0", Some(92827),
Some("merged into `min_generic_const_args`")),
(removed, await_macro, "1.38.0", Some(50547),
Some("subsumed by `.await` syntax"), 62293),
Expand Down Expand Up @@ -275,7 +275,7 @@ declare_features! (
(removed, static_nobundle, "1.63.0", Some(37403),
Some(r#"subsumed by `#[link(kind = "static", modifiers = "-bundle", ...)]`"#), 95818),
/// Allows string patterns to dereference values to match them.
(removed, string_deref_patterns, "CURRENT_RUSTC_VERSION", Some(87121), Some("superseded by `deref_patterns`"), 150530),
(removed, string_deref_patterns, "1.94.0", Some(87121), Some("superseded by `deref_patterns`"), 150530),
(removed, struct_inherit, "1.0.0", None, None),
(removed, test_removed_feature, "1.0.0", None, None),
/// Allows using items which are missing stability attributes
Expand Down
6 changes: 3 additions & 3 deletions compiler/rustc_feature/src/unstable.rs
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Expand Up @@ -222,7 +222,7 @@ declare_features! (
/// Allows writing custom MIR
(internal, custom_mir, "1.65.0", None),
/// Implementation details of externally implementable items
(internal, eii_internals, "CURRENT_RUSTC_VERSION", None),
(internal, eii_internals, "1.94.0", None),
/// Outputs useful `assert!` messages
(unstable, generic_assert, "1.63.0", None),
/// Allows using the #[rustc_intrinsic] attribute.
Expand Down Expand Up @@ -477,7 +477,7 @@ declare_features! (
/// Allows using `#[export_stable]` which indicates that an item is exportable.
(incomplete, export_stable, "1.88.0", Some(139939)),
/// Externally implementable items
(unstable, extern_item_impls, "CURRENT_RUSTC_VERSION", Some(125418)),
(unstable, extern_item_impls, "1.94.0", Some(125418)),
/// Allows defining `extern type`s.
(unstable, extern_types, "1.23.0", Some(43467)),
/// Allow using 128-bit (quad precision) floating point numbers.
Expand Down Expand Up @@ -667,7 +667,7 @@ declare_features! (
/// Allows using `try {...}` expressions.
(unstable, try_blocks, "1.29.0", Some(31436)),
/// Allows using `try bikeshed TargetType {...}` expressions.
(unstable, try_blocks_heterogeneous, "CURRENT_RUSTC_VERSION", Some(149488)),
(unstable, try_blocks_heterogeneous, "1.94.0", Some(149488)),
/// Allows `impl Trait` to be used inside type aliases (RFC 2515).
(unstable, type_alias_impl_trait, "1.38.0", Some(63063)),
/// Allows creation of instances of a struct by moving fields that have
Expand Down
3 changes: 0 additions & 3 deletions compiler/rustc_fluent_macro/src/fluent.rs
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Expand Up @@ -8,10 +8,7 @@ use fluent_syntax::ast::{
Attribute, Entry, Expression, Identifier, InlineExpression, Message, Pattern, PatternElement,
};
use fluent_syntax::parser::ParserError;
#[cfg(not(bootstrap))]
use proc_macro::tracked::path;
#[cfg(bootstrap)]
use proc_macro::tracked_path::path;
use proc_macro::{Diagnostic, Level, Span};
use proc_macro2::TokenStream;
use quote::quote;
Expand Down
3 changes: 1 addition & 2 deletions compiler/rustc_fluent_macro/src/lib.rs
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@@ -1,8 +1,7 @@
// tidy-alphabetical-start
#![allow(rustc::default_hash_types)]
#![cfg_attr(bootstrap, feature(track_path))]
#![cfg_attr(not(bootstrap), feature(proc_macro_tracked_path))]
#![feature(proc_macro_diagnostic)]
#![feature(proc_macro_tracked_path)]
// tidy-alphabetical-end

use proc_macro::TokenStream;
Expand Down
1 change: 0 additions & 1 deletion compiler/rustc_lint/src/lib.rs
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Expand Up @@ -21,7 +21,6 @@

// tidy-alphabetical-start
#![allow(internal_features)]
#![cfg_attr(bootstrap, feature(array_windows))]
#![feature(assert_matches)]
#![feature(box_patterns)]
#![feature(if_let_guard)]
Expand Down
3 changes: 0 additions & 3 deletions compiler/rustc_macros/src/current_version.rs
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Expand Up @@ -22,10 +22,7 @@ struct RustcVersion {

impl RustcVersion {
fn parse_cfg_release(env_var: &str) -> Result<Self, Box<dyn std::error::Error>> {
#[cfg(not(bootstrap))]
let value = proc_macro::tracked::env_var(env_var)?;
#[cfg(bootstrap)]
let value = proc_macro::tracked_env::var(env_var)?;

Self::parse_str(&value)
.ok_or_else(|| format!("failed to parse rustc version: {:?}", value).into())
Expand Down
4 changes: 0 additions & 4 deletions compiler/rustc_macros/src/symbols.rs
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Expand Up @@ -259,10 +259,6 @@ fn symbols_with_errors(input: TokenStream) -> (TokenStream, Vec<syn::Error>) {
break;
}

#[cfg(bootstrap)]
let tracked_env = proc_macro::tracked_env::var(env_var.value());

#[cfg(not(bootstrap))]
let tracked_env = proc_macro::tracked::env_var(env_var.value());

let value = match tracked_env {
Expand Down
1 change: 0 additions & 1 deletion compiler/rustc_middle/src/lib.rs
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Expand Up @@ -27,7 +27,6 @@
// tidy-alphabetical-start
#![allow(internal_features)]
#![allow(rustc::direct_use_of_rustc_type_ir)]
#![cfg_attr(bootstrap, feature(array_windows))]
#![feature(allocator_api)]
#![feature(assert_matches)]
#![feature(associated_type_defaults)]
Expand Down
1 change: 0 additions & 1 deletion compiler/rustc_mir_transform/src/lib.rs
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@@ -1,5 +1,4 @@
// tidy-alphabetical-start
#![cfg_attr(bootstrap, feature(array_windows))]
#![feature(assert_matches)]
#![feature(box_patterns)]
#![feature(const_type_name)]
Expand Down
1 change: 0 additions & 1 deletion compiler/rustc_monomorphize/src/lib.rs
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@@ -1,5 +1,4 @@
// tidy-alphabetical-start
#![cfg_attr(bootstrap, feature(array_windows))]
#![feature(file_buffered)]
#![feature(if_let_guard)]
#![feature(impl_trait_in_assoc_type)]
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1 change: 0 additions & 1 deletion compiler/rustc_span/src/lib.rs
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Expand Up @@ -17,7 +17,6 @@

// tidy-alphabetical-start
#![allow(internal_features)]
#![cfg_attr(bootstrap, feature(array_windows))]
#![cfg_attr(target_arch = "loongarch64", feature(stdarch_loongarch))]
#![feature(cfg_select)]
#![feature(core_io_borrowed_buf)]
Expand Down
2 changes: 1 addition & 1 deletion library/alloc/src/slice.rs
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Expand Up @@ -18,7 +18,7 @@ use core::cmp::Ordering::{self, Less};
use core::mem::MaybeUninit;
#[cfg(not(no_global_oom_handling))]
use core::ptr;
#[stable(feature = "array_windows", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "array_windows", since = "1.94.0")]
pub use core::slice::ArrayWindows;
#[stable(feature = "inherent_ascii_escape", since = "1.60.0")]
pub use core::slice::EscapeAscii;
Expand Down
6 changes: 3 additions & 3 deletions library/core/src/cell/lazy.rs
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Expand Up @@ -175,7 +175,7 @@ impl<T, F: FnOnce() -> T> LazyCell<T, F> {
/// assert_eq!(*lazy, 44);
/// ```
#[inline]
#[stable(feature = "lazy_get", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_get", since = "1.94.0")]
pub fn force_mut(this: &mut LazyCell<T, F>) -> &mut T {
#[cold]
/// # Safety
Expand Down Expand Up @@ -273,7 +273,7 @@ impl<T, F> LazyCell<T, F> {
/// assert_eq!(*lazy, 44);
/// ```
#[inline]
#[stable(feature = "lazy_get", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_get", since = "1.94.0")]
pub fn get_mut(this: &mut LazyCell<T, F>) -> Option<&mut T> {
let state = this.state.get_mut();
match state {
Expand All @@ -297,7 +297,7 @@ impl<T, F> LazyCell<T, F> {
/// assert_eq!(LazyCell::get(&lazy), Some(&92));
/// ```
#[inline]
#[stable(feature = "lazy_get", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_get", since = "1.94.0")]
pub fn get(this: &LazyCell<T, F>) -> Option<&T> {
// SAFETY:
// This is sound for the same reason as in `force`: once the state is
Expand Down
2 changes: 1 addition & 1 deletion library/core/src/char/convert.rs
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Expand Up @@ -162,7 +162,7 @@ impl const TryFrom<char> for u16 {
///
/// Generally speaking, this conversion can be seen as obtaining the character's corresponding
/// UTF-32 code point to the extent representable by pointer addresses.
#[stable(feature = "usize_try_from_char", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "usize_try_from_char", since = "1.94.0")]
#[rustc_const_unstable(feature = "const_convert", issue = "143773")]
impl const TryFrom<char> for usize {
type Error = TryFromCharError;
Expand Down
4 changes: 2 additions & 2 deletions library/core/src/iter/adapters/peekable.rs
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Expand Up @@ -406,7 +406,7 @@ impl<I: Iterator> Peekable<I> {
///# ],
///# )
/// ```
#[stable(feature = "peekable_next_if_map", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "peekable_next_if_map", since = "1.94.0")]
pub fn next_if_map<R>(&mut self, f: impl FnOnce(I::Item) -> Result<R, I::Item>) -> Option<R> {
let unpeek = if let Some(item) = self.next() {
match f(item) {
Expand Down Expand Up @@ -443,7 +443,7 @@ impl<I: Iterator> Peekable<I> {
/// assert_eq!(line_num, 125);
/// assert_eq!(iter.collect::<String>(), " GOTO 10");
/// ```
#[stable(feature = "peekable_next_if_map", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "peekable_next_if_map", since = "1.94.0")]
pub fn next_if_map_mut<R>(&mut self, f: impl FnOnce(&mut I::Item) -> Option<R>) -> Option<R> {
let unpeek = if let Some(mut item) = self.next() {
match f(&mut item) {
Expand Down
4 changes: 2 additions & 2 deletions library/core/src/num/f32.rs
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Expand Up @@ -292,11 +292,11 @@ pub mod consts {
pub const TAU: f32 = 6.28318530717958647692528676655900577_f32;

/// The golden ratio (φ)
#[stable(feature = "euler_gamma_golden_ratio", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "euler_gamma_golden_ratio", since = "1.94.0")]
pub const GOLDEN_RATIO: f32 = 1.618033988749894848204586834365638118_f32;

/// The Euler-Mascheroni constant (γ)
#[stable(feature = "euler_gamma_golden_ratio", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "euler_gamma_golden_ratio", since = "1.94.0")]
pub const EULER_GAMMA: f32 = 0.577215664901532860606512090082402431_f32;

/// π/2
Expand Down
4 changes: 2 additions & 2 deletions library/core/src/num/f64.rs
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Expand Up @@ -292,11 +292,11 @@ pub mod consts {
pub const TAU: f64 = 6.28318530717958647692528676655900577_f64;

/// The golden ratio (φ)
#[stable(feature = "euler_gamma_golden_ratio", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "euler_gamma_golden_ratio", since = "1.94.0")]
pub const GOLDEN_RATIO: f64 = 1.618033988749894848204586834365638118_f64;

/// The Euler-Mascheroni constant (γ)
#[stable(feature = "euler_gamma_golden_ratio", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "euler_gamma_golden_ratio", since = "1.94.0")]
pub const EULER_GAMMA: f64 = 0.577215664901532860606512090082402431_f64;

/// π/2
Expand Down
8 changes: 4 additions & 4 deletions library/core/src/slice/iter.rs
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Expand Up @@ -2176,7 +2176,7 @@ unsafe impl<T> Sync for ChunksExactMut<'_, T> where T: Sync {}
/// [`array_windows`]: slice::array_windows
/// [slices]: slice
#[derive(Debug, Clone, Copy)]
#[stable(feature = "array_windows", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "array_windows", since = "1.94.0")]
#[must_use = "iterators are lazy and do nothing unless consumed"]
pub struct ArrayWindows<'a, T: 'a, const N: usize> {
v: &'a [T],
Expand All @@ -2189,7 +2189,7 @@ impl<'a, T: 'a, const N: usize> ArrayWindows<'a, T, N> {
}
}

#[stable(feature = "array_windows", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "array_windows", since = "1.94.0")]
impl<'a, T, const N: usize> Iterator for ArrayWindows<'a, T, N> {
type Item = &'a [T; N];

Expand Down Expand Up @@ -2226,7 +2226,7 @@ impl<'a, T, const N: usize> Iterator for ArrayWindows<'a, T, N> {
}
}

#[stable(feature = "array_windows", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "array_windows", since = "1.94.0")]
impl<'a, T, const N: usize> DoubleEndedIterator for ArrayWindows<'a, T, N> {
#[inline]
fn next_back(&mut self) -> Option<&'a [T; N]> {
Expand All @@ -2245,7 +2245,7 @@ impl<'a, T, const N: usize> DoubleEndedIterator for ArrayWindows<'a, T, N> {
}
}

#[stable(feature = "array_windows", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "array_windows", since = "1.94.0")]
impl<T, const N: usize> ExactSizeIterator for ArrayWindows<'_, T, N> {
fn is_empty(&self) -> bool {
self.v.len() < N
Expand Down
6 changes: 3 additions & 3 deletions library/core/src/slice/mod.rs
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Expand Up @@ -52,7 +52,7 @@ pub use ascii::is_ascii_simple;
pub use index::SliceIndex;
#[unstable(feature = "slice_range", issue = "76393")]
pub use index::{range, try_range};
#[stable(feature = "array_windows", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "array_windows", since = "1.94.0")]
pub use iter::ArrayWindows;
#[stable(feature = "slice_group_by", since = "1.77.0")]
pub use iter::{ChunkBy, ChunkByMut};
Expand Down Expand Up @@ -1639,7 +1639,7 @@ impl<T> [T] {
/// ```
///
/// [`windows`]: slice::windows
#[stable(feature = "array_windows", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "array_windows", since = "1.94.0")]
#[rustc_const_unstable(feature = "const_slice_make_iter", issue = "137737")]
#[inline]
#[track_caller]
Expand Down Expand Up @@ -5045,7 +5045,7 @@ impl<T> [T] {
/// assert_eq!(arr.element_offset(weird_elm), None); // Points between element 0 and 1
/// ```
#[must_use]
#[stable(feature = "element_offset", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "element_offset", since = "1.94.0")]
pub fn element_offset(&self, element: &T) -> Option<usize> {
if T::IS_ZST {
panic!("elements are zero-sized");
Expand Down
2 changes: 1 addition & 1 deletion library/std/src/num/f32.rs
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Expand Up @@ -217,7 +217,7 @@ impl f32 {
#[must_use = "method returns a new number and does not mutate the original value"]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
#[rustc_const_stable(feature = "const_mul_add", since = "CURRENT_RUSTC_VERSION")]
#[rustc_const_stable(feature = "const_mul_add", since = "1.94.0")]
pub const fn mul_add(self, a: f32, b: f32) -> f32 {
core::f32::math::mul_add(self, a, b)
}
Expand Down
2 changes: 1 addition & 1 deletion library/std/src/num/f64.rs
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Expand Up @@ -217,7 +217,7 @@ impl f64 {
#[must_use = "method returns a new number and does not mutate the original value"]
#[stable(feature = "rust1", since = "1.0.0")]
#[inline]
#[rustc_const_stable(feature = "const_mul_add", since = "CURRENT_RUSTC_VERSION")]
#[rustc_const_stable(feature = "const_mul_add", since = "1.94.0")]
pub const fn mul_add(self, a: f64, b: f64) -> f64 {
core::f64::math::mul_add(self, a, b)
}
Expand Down
6 changes: 3 additions & 3 deletions library/std/src/sync/lazy_lock.rs
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Expand Up @@ -182,7 +182,7 @@ impl<T, F: FnOnce() -> T> LazyLock<T, F> {
/// assert_eq!(*lazy, 44);
/// ```
#[inline]
#[stable(feature = "lazy_get", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_get", since = "1.94.0")]
pub fn force_mut(this: &mut LazyLock<T, F>) -> &mut T {
#[cold]
/// # Safety
Expand Down Expand Up @@ -288,7 +288,7 @@ impl<T, F> LazyLock<T, F> {
/// assert_eq!(*lazy, 44);
/// ```
#[inline]
#[stable(feature = "lazy_get", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_get", since = "1.94.0")]
pub fn get_mut(this: &mut LazyLock<T, F>) -> Option<&mut T> {
// `state()` does not perform an atomic load, so prefer it over `is_complete()`.
let state = this.once.state();
Expand All @@ -315,7 +315,7 @@ impl<T, F> LazyLock<T, F> {
/// assert_eq!(LazyLock::get(&lazy), Some(&92));
/// ```
#[inline]
#[stable(feature = "lazy_get", since = "CURRENT_RUSTC_VERSION")]
#[stable(feature = "lazy_get", since = "1.94.0")]
#[rustc_should_not_be_called_on_const_items]
pub fn get(this: &LazyLock<T, F>) -> Option<&T> {
if this.once.is_completed() {
Expand Down
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