Auto merge of rust-lang#107297 - Mark-Simulacrum:bump-bootstrap, r=pietroalbini

Bump bootstrap compiler to 1.68

This also changes our stage0.json to include the rustc component for the rustfmt pinned nightly toolchain, which is currently necessary due to rustfmt dynamically linking to that toolchain's librustc_driver and libstd.

r? `@pietroalbini`

Author: bors

compiler/rustc_const_eval/src/interpret/intern.rs

@@ -30,15 +30,15 @@ use super::{
 use crate::const_eval;
 
 pub trait CompileTimeMachine<'mir, 'tcx, T> = Machine<
-    'mir,
-    'tcx,
-    MemoryKind = T,
-    Provenance = AllocId,
-    ExtraFnVal = !,
-    FrameExtra = (),
-    AllocExtra = (),
-    MemoryMap = FxIndexMap<AllocId, (MemoryKind<T>, Allocation)>,
->;
+        'mir,
+        'tcx,
+        MemoryKind = T,
+        Provenance = AllocId,
+        ExtraFnVal = !,
+        FrameExtra = (),
+        AllocExtra = (),
+        MemoryMap = FxIndexMap<AllocId, (MemoryKind<T>, Allocation)>,
+    >;
 
 struct InternVisitor<'rt, 'mir, 'tcx, M: CompileTimeMachine<'mir, 'tcx, const_eval::MemoryKind>> {
     /// The ectx from which we intern.

compiler/rustc_data_structures/src/obligation_forest/mod.rs

@@ -95,10 +95,7 @@ pub trait ForestObligation: Clone + Debug {
 pub trait ObligationProcessor {
     type Obligation: ForestObligation;
     type Error: Debug;
-    type OUT: OutcomeTrait<
-        Obligation = Self::Obligation,
-        Error = Error<Self::Obligation, Self::Error>,
-    >;
+    type OUT: OutcomeTrait<Obligation = Self::Obligation, Error = Error<Self::Obligation, Self::Error>>;
 
     fn needs_process_obligation(&self, obligation: &Self::Obligation) -> bool;
 

compiler/rustc_feature/src/accepted.rs

@@ -49,7 +49,7 @@ declare_features! (
     /// Allows `#[target_feature(...)]` on aarch64 platforms
     (accepted, aarch64_target_feature, "1.61.0", Some(44839), None),
     /// Allows using the `efiapi` ABI.
-    (accepted, abi_efiapi, "CURRENT_RUSTC_VERSION", Some(65815), None),
+    (accepted, abi_efiapi, "1.68.0", Some(65815), None),
     /// Allows the sysV64 ABI to be specified on all platforms
     /// instead of just the platforms on which it is the C ABI.
     (accepted, abi_sysv64, "1.24.0", Some(36167), None),
@@ -129,7 +129,7 @@ declare_features! (
     /// Allows `crate` in paths.
     (accepted, crate_in_paths, "1.30.0", Some(45477), None),
     /// Allows rustc to inject a default alloc_error_handler
-    (accepted, default_alloc_error_handler, "CURRENT_RUSTC_VERSION", Some(66741), None),
+    (accepted, default_alloc_error_handler, "1.68.0", Some(66741), None),
     /// Allows using assigning a default type to type parameters in algebraic data type definitions.
     (accepted, default_type_params, "1.0.0", None, None),
     /// Allows `#[deprecated]` attribute.
@@ -164,7 +164,7 @@ declare_features! (
     /// Allows access to crate names passed via `--extern` through prelude.
     (accepted, extern_prelude, "1.30.0", Some(44660), None),
     /// Allows using F16C intrinsics from `core::arch::{x86, x86_64}`.
-    (accepted, f16c_target_feature, "CURRENT_RUSTC_VERSION", Some(44839), None),
+    (accepted, f16c_target_feature, "1.68.0", Some(44839), None),
     /// Allows field shorthands (`x` meaning `x: x`) in struct literal expressions.
     (accepted, field_init_shorthand, "1.17.0", Some(37340), None),
     /// Allows `#[must_use]` on functions, and introduces must-use operators (RFC 1940).

compiler/rustc_feature/src/active.rs

@@ -342,7 +342,7 @@ declare_features! (
     /// Allows `async {}` expressions in const contexts.
     (active, const_async_blocks, "1.53.0", Some(85368), None),
     /// Allows `const || {}` closures in const contexts.
-    (incomplete, const_closures, "CURRENT_RUSTC_VERSION", Some(106003), None),
+    (incomplete, const_closures, "1.68.0", Some(106003), None),
     /// Allows limiting the evaluation steps of const expressions
     (active, const_eval_limit, "1.43.0", Some(67217), None),
     /// Allows the definition of `const extern fn` and `const unsafe extern fn`.

library/alloc/src/collections/vec_deque/mod.rs

@@ -537,7 +537,7 @@ impl<T> VecDeque<T> {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_stable(feature = "const_vec_deque_new", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "const_vec_deque_new", since = "1.68.0")]
     #[must_use]
     pub const fn new() -> VecDeque<T> {
         // FIXME: This should just be `VecDeque::new_in(Global)` once that hits stable.

library/alloc/src/string.rs

@@ -2549,7 +2549,7 @@ impl ToString for char {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "bool_to_string_specialization", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "bool_to_string_specialization", since = "1.68.0")]
 impl ToString for bool {
     #[inline]
     fn to_string(&self) -> String {

library/core/src/cmp.rs

@@ -798,16 +798,7 @@ pub trait Ord: Eq + PartialOrd<Self> {
         Self: Sized,
         Self: ~const Destruct,
     {
-        #[cfg(not(bootstrap))]
-        {
-            max_by(self, other, Ord::cmp)
-        }
-
-        #[cfg(bootstrap)]
-        match self.cmp(&other) {
-            Ordering::Less | Ordering::Equal => other,
-            Ordering::Greater => self,
-        }
+        max_by(self, other, Ord::cmp)
     }
 
     /// Compares and returns the minimum of two values.
@@ -828,16 +819,7 @@ pub trait Ord: Eq + PartialOrd<Self> {
         Self: Sized,
         Self: ~const Destruct,
     {
-        #[cfg(not(bootstrap))]
-        {
-            min_by(self, other, Ord::cmp)
-        }
-
-        #[cfg(bootstrap)]
-        match self.cmp(&other) {
-            Ordering::Less | Ordering::Equal => self,
-            Ordering::Greater => other,
-        }
+        min_by(self, other, Ord::cmp)
     }
 
     /// Restrict a value to a certain interval.
@@ -1234,23 +1216,7 @@ where
     F: ~const Destruct,
     K: ~const Destruct,
 {
-    cfg_if! {
-        if #[cfg(bootstrap)] {
-            const fn imp<T, F: ~const FnMut(&T) -> K, K: ~const Ord>(
-                f: &mut F,
-                (v1, v2): (&T, &T),
-            ) -> Ordering
-            where
-                T: ~const Destruct,
-                K: ~const Destruct,
-            {
-                f(v1).cmp(&f(v2))
-            }
-            min_by(v1, v2, ConstFnMutClosure::new(&mut f, imp))
-        } else {
-            min_by(v1, v2, const |v1, v2| f(v1).cmp(&f(v2)))
-        }
-    }
+    min_by(v1, v2, const |v1, v2| f(v1).cmp(&f(v2)))
 }
 
 /// Compares and returns the maximum of two values.

library/core/src/convert/num.rs

@@ -169,7 +169,7 @@ impl_from! { u32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0"
 impl_from! { f32, f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")] }
 
 // bool -> Float
-#[stable(feature = "float_from_bool", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "float_from_bool", since = "1.68.0")]
 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
 impl const From<bool> for f32 {
     /// Converts `bool` to `f32` losslessly.
@@ -178,7 +178,7 @@ impl const From<bool> for f32 {
         small as u8 as Self
     }
 }
-#[stable(feature = "float_from_bool", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "float_from_bool", since = "1.68.0")]
 #[rustc_const_unstable(feature = "const_num_from_num", issue = "87852")]
 impl const From<bool> for f64 {
     /// Converts `bool` to `f64` losslessly.

library/core/src/intrinsics.rs

@@ -58,7 +58,6 @@ use crate::marker::DiscriminantKind;
 use crate::marker::Tuple;
 use crate::mem;
 
-#[cfg(not(bootstrap))]
 pub mod mir;
 
 // These imports are used for simplifying intra-doc links
@@ -963,7 +962,6 @@ extern "rust-intrinsic" {
     /// This intrinsic does not have a stable counterpart.
     #[rustc_const_unstable(feature = "const_assert_type2", issue = "none")]
     #[rustc_safe_intrinsic]
-    #[cfg(not(bootstrap))]
     pub fn assert_mem_uninitialized_valid<T>();
 
     /// Gets a reference to a static `Location` indicating where it was called.

library/core/src/intrinsics/mir.rs

@@ -60,8 +60,7 @@
 //!
 //! # Examples
 //!
-#![cfg_attr(bootstrap, doc = "```rust,compile_fail")]
-#![cfg_attr(not(bootstrap), doc = "```rust")]
+//! ```rust
 //! #![feature(core_intrinsics, custom_mir)]
 //!
 //! extern crate core;
@@ -300,8 +299,7 @@ define!(
     ///
     /// # Examples
     ///
-    #[cfg_attr(bootstrap, doc = "```rust,compile_fail")]
-    #[cfg_attr(not(bootstrap), doc = "```rust")]
+    /// ```rust
     /// #![feature(custom_mir, core_intrinsics)]
     ///
     /// extern crate core;

library/core/src/iter/sources/once_with.rs

@@ -73,7 +73,7 @@ pub struct OnceWith<F> {
     gen: Option<F>,
 }
 
-#[stable(feature = "iter_once_with_debug", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "iter_once_with_debug", since = "1.68.0")]
 impl<F> fmt::Debug for OnceWith<F> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if self.gen.is_some() {

library/core/src/iter/sources/repeat_with.rs

@@ -78,7 +78,7 @@ pub struct RepeatWith<F> {
     repeater: F,
 }
 
-#[stable(feature = "iterator_repeat_with_debug", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "iterator_repeat_with_debug", since = "1.68.0")]
 impl<F> fmt::Debug for RepeatWith<F> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("RepeatWith").finish_non_exhaustive()

library/core/src/lib.rs

@@ -192,7 +192,7 @@
 #![feature(cfg_sanitize)]
 #![feature(cfg_target_has_atomic)]
 #![feature(cfg_target_has_atomic_equal_alignment)]
-#![cfg_attr(not(bootstrap), feature(const_closures))]
+#![feature(const_closures)]
 #![feature(const_fn_floating_point_arithmetic)]
 #![feature(const_mut_refs)]
 #![feature(const_precise_live_drops)]
@@ -250,7 +250,6 @@
 #![feature(sse4a_target_feature)]
 #![feature(tbm_target_feature)]
 #![feature(wasm_target_feature)]
-#![cfg_attr(bootstrap, feature(f16c_target_feature))]
 
 // allow using `core::` in intra-doc links
 #[allow(unused_extern_crates)]

library/core/src/mem/mod.rs

@@ -682,7 +682,6 @@ pub unsafe fn zeroed<T>() -> T {
 pub unsafe fn uninitialized<T>() -> T {
     // SAFETY: the caller must guarantee that an uninitialized value is valid for `T`.
     unsafe {
-        #[cfg(not(bootstrap))] // If the compiler hits this itself then it deserves the UB.
         intrinsics::assert_mem_uninitialized_valid::<T>();
         let mut val = MaybeUninit::<T>::uninit();
 

library/core/src/panicking.rs

@@ -117,7 +117,7 @@ pub const fn panic(expr: &'static str) -> ! {
 /// Like `panic`, but without unwinding and track_caller to reduce the impact on codesize.
 #[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
 #[cfg_attr(feature = "panic_immediate_abort", inline)]
-#[cfg_attr(not(bootstrap), lang = "panic_nounwind")] // needed by codegen for non-unwinding panics
+#[lang = "panic_nounwind"] // needed by codegen for non-unwinding panics
 #[rustc_nounwind]
 pub fn panic_nounwind(expr: &'static str) -> ! {
     panic_nounwind_fmt(fmt::Arguments::new_v1(&[expr], &[]));
@@ -165,8 +165,7 @@ fn panic_bounds_check(index: usize, len: usize) -> ! {
 /// any extra arguments (including those synthesized by track_caller).
 #[cfg_attr(not(feature = "panic_immediate_abort"), inline(never), cold)]
 #[cfg_attr(feature = "panic_immediate_abort", inline)]
-#[cfg_attr(bootstrap, lang = "panic_no_unwind")] // needed by codegen for panic in nounwind function
-#[cfg_attr(not(bootstrap), lang = "panic_cannot_unwind")] // needed by codegen for panic in nounwind function
+#[lang = "panic_cannot_unwind"] // needed by codegen for panic in nounwind function
 #[rustc_nounwind]
 fn panic_cannot_unwind() -> ! {
     panic_nounwind("panic in a function that cannot unwind")

library/core/src/pin.rs

@@ -1164,7 +1164,7 @@ impl<P, U> DispatchFromDyn<Pin<U>> for Pin<P> where P: DispatchFromDyn<U> {}
 /// constructor.
 ///
 /// [`Box::pin`]: ../../std/boxed/struct.Box.html#method.pin
-#[stable(feature = "pin_macro", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "pin_macro", since = "1.68.0")]
 #[rustc_macro_transparency = "semitransparent"]
 #[allow_internal_unstable(unsafe_pin_internals)]
 pub macro pin($value:expr $(,)?) {

library/core/src/task/wake.rs

@@ -174,7 +174,7 @@ impl RawWakerVTable {
 /// Currently, `Context` only serves to provide access to a [`&Waker`](Waker)
 /// which can be used to wake the current task.
 #[stable(feature = "futures_api", since = "1.36.0")]
-#[cfg_attr(not(bootstrap), lang = "Context")]
+#[lang = "Context"]
 pub struct Context<'a> {
     waker: &'a Waker,
     // Ensure we future-proof against variance changes by forcing

library/std/src/path.rs

@@ -271,7 +271,7 @@ pub const MAIN_SEPARATOR: char = crate::sys::path::MAIN_SEP;
 /// The primary separator of path components for the current platform.
 ///
 /// For example, `/` on Unix and `\` on Windows.
-#[stable(feature = "main_separator_str", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "main_separator_str", since = "1.68.0")]
 pub const MAIN_SEPARATOR_STR: &str = crate::sys::path::MAIN_SEP_STR;
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -1778,7 +1778,7 @@ impl ops::Deref for PathBuf {
     }
 }
 
-#[stable(feature = "path_buf_deref_mut", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "path_buf_deref_mut", since = "1.68.0")]
 impl ops::DerefMut for PathBuf {
     #[inline]
     fn deref_mut(&mut self) -> &mut Path {

src/bootstrap/download.rs

@@ -318,15 +318,27 @@ impl Config {
         let channel = format!("{version}-{date}");
 
         let host = self.build;
-        let rustfmt_path = self.initial_rustc.with_file_name(exe("rustfmt", host));
-        let bin_root = self.out.join(host.triple).join("stage0");
+        let bin_root = self.out.join(host.triple).join("rustfmt");
+        let rustfmt_path = bin_root.join("bin").join(exe("rustfmt", host));
         let rustfmt_stamp = bin_root.join(".rustfmt-stamp");
         if rustfmt_path.exists() && !program_out_of_date(&rustfmt_stamp, &channel) {
             return Some(rustfmt_path);
         }
 
-        let filename = format!("rustfmt-{version}-{build}.tar.xz", build = host.triple);
-        self.download_component(DownloadSource::Dist, filename, "rustfmt-preview", &date, "stage0");
+        self.download_component(
+            DownloadSource::Dist,
+            format!("rustfmt-{version}-{build}.tar.xz", build = host.triple),
+            "rustfmt-preview",
+            &date,
+            "rustfmt",
+        );
+        self.download_component(
+            DownloadSource::Dist,
+            format!("rustc-{version}-{build}.tar.xz", build = host.triple),
+            "rustc",
+            &date,
+            "rustfmt",
+        );
 
         self.fix_bin_or_dylib(&bin_root.join("bin").join("rustfmt"));
         self.fix_bin_or_dylib(&bin_root.join("bin").join("cargo-fmt"));