Rollup merge of #112103 - Mark-Simulacrum:bootstrap-update, r=clubby789

Bootstrap update to 1.71 beta

Best reviewed by-commit.

Author: matthiaskrgr

alloc/src/alloc.rs

@@ -38,7 +38,6 @@ extern "Rust" {
     #[rustc_nounwind]
     fn __rust_alloc_zeroed(size: usize, align: usize) -> *mut u8;
 
-    #[cfg(not(bootstrap))]
     static __rust_no_alloc_shim_is_unstable: u8;
 }
 
@@ -96,7 +95,6 @@ pub unsafe fn alloc(layout: Layout) -> *mut u8 {
     unsafe {
         // Make sure we don't accidentally allow omitting the allocator shim in
         // stable code until it is actually stabilized.
-        #[cfg(not(bootstrap))]
         core::ptr::read_volatile(&__rust_no_alloc_shim_is_unstable);
 
         __rust_alloc(layout.size(), layout.align())

alloc/src/string.rs

@@ -2624,7 +2624,7 @@ impl ToString for String {
 }
 
 #[cfg(not(no_global_oom_handling))]
-#[stable(feature = "fmt_arguments_to_string_specialization", since = "CURRENT_RUSTC_VERSION")]
+#[stable(feature = "fmt_arguments_to_string_specialization", since = "1.71.0")]
 impl ToString for fmt::Arguments<'_> {
     #[inline]
     fn to_string(&self) -> String {

core/src/ffi/c_str.rs

@@ -81,7 +81,7 @@ use crate::str;
 #[derive(Hash)]
 #[stable(feature = "core_c_str", since = "1.64.0")]
 #[rustc_has_incoherent_inherent_impls]
-#[cfg_attr(not(bootstrap), lang = "CStr")]
+#[lang = "CStr"]
 // FIXME:
 // `fn from` in `impl From<&CStr> for Box<CStr>` current implementation relies
 // on `CStr` being layout-compatible with `[u8]`.
@@ -531,8 +531,8 @@ impl CStr {
     /// # }
     /// ```
     #[inline]
-    #[stable(feature = "cstr_is_empty", since = "CURRENT_RUSTC_VERSION")]
-    #[rustc_const_stable(feature = "cstr_is_empty", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "cstr_is_empty", since = "1.71.0")]
+    #[rustc_const_stable(feature = "cstr_is_empty", since = "1.71.0")]
     pub const fn is_empty(&self) -> bool {
         // SAFETY: We know there is at least one byte; for empty strings it
         // is the NUL terminator.

core/src/ffi/mod.rs

@@ -202,7 +202,7 @@ mod c_long_definition {
 //     would be uninhabited and at least dereferencing such pointers would
 //     be UB.
 #[doc = include_str!("c_void.md")]
-#[cfg_attr(not(bootstrap), lang = "c_void")]
+#[lang = "c_void"]
 #[cfg_attr(not(doc), repr(u8))] // work around https://github.com/rust-lang/rust/issues/90435
 #[stable(feature = "core_c_void", since = "1.30.0")]
 pub enum c_void {

core/src/hash/mod.rs

@@ -695,7 +695,7 @@ pub trait BuildHasher {
     ///     bh.hash_one(&OrderAmbivalentPair(2, 10))
     /// );
     /// ```
-    #[stable(feature = "build_hasher_simple_hash_one", since = "CURRENT_RUSTC_VERSION")]
+    #[stable(feature = "build_hasher_simple_hash_one", since = "1.71.0")]
     fn hash_one<T: Hash>(&self, x: T) -> u64
     where
         Self: Sized,

core/src/intrinsics.rs

@@ -1385,7 +1385,6 @@ extern "rust-intrinsic" {
     ///
     /// This is not expected to ever be exposed directly to users, rather it
     /// may eventually be exposed through some more-constrained API.
-    #[cfg(not(bootstrap))]
     #[rustc_const_stable(feature = "const_transmute", since = "1.56.0")]
     #[rustc_nounwind]
     pub fn transmute_unchecked<Src, Dst>(src: Src) -> Dst;
@@ -1425,19 +1424,11 @@ extern "rust-intrinsic" {
     /// returned value will result in undefined behavior.
     ///
     /// The stabilized version of this intrinsic is [`pointer::offset`].
-    #[cfg(not(bootstrap))]
     #[must_use = "returns a new pointer rather than modifying its argument"]
     #[rustc_const_stable(feature = "const_ptr_offset", since = "1.61.0")]
     #[rustc_nounwind]
     pub fn offset<Ptr, Delta>(dst: Ptr, offset: Delta) -> Ptr;
 
-    /// The bootstrap version of this is more restricted.
-    #[cfg(bootstrap)]
-    #[must_use = "returns a new pointer rather than modifying its argument"]
-    #[rustc_const_stable(feature = "const_ptr_offset", since = "1.61.0")]
-    #[rustc_nounwind]
-    pub fn offset<T>(dst: *const T, offset: isize) -> *const T;
-
     /// Calculates the offset from a pointer, potentially wrapping.
     ///
     /// This is implemented as an intrinsic to avoid converting to and from an
@@ -2260,7 +2251,7 @@ extern "rust-intrinsic" {
     /// This intrinsic can *only* be called where the pointer is a local without
     /// projections (`read_via_copy(ptr)`, not `read_via_copy(*ptr)`) so that it
     /// trivially obeys runtime-MIR rules about derefs in operands.
-    #[rustc_const_stable(feature = "const_ptr_read", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "const_ptr_read", since = "1.71.0")]
     #[rustc_nounwind]
     pub fn read_via_copy<T>(ptr: *const T) -> T;
 
@@ -2270,7 +2261,6 @@ extern "rust-intrinsic" {
     /// This intrinsic can *only* be called where the pointer is a local without
     /// projections (`write_via_move(ptr, x)`, not `write_via_move(*ptr, x)`) so
     /// that it trivially obeys runtime-MIR rules about derefs in operands.
-    #[cfg(not(bootstrap))]
     #[rustc_const_unstable(feature = "const_ptr_write", issue = "86302")]
     #[rustc_nounwind]
     pub fn write_via_move<T>(ptr: *mut T, value: T);
@@ -2832,24 +2822,3 @@ pub const unsafe fn write_bytes<T>(dst: *mut T, val: u8, count: usize) {
         write_bytes(dst, val, count)
     }
 }
-
-/// Polyfill for bootstrap
-#[cfg(bootstrap)]
-pub const unsafe fn transmute_unchecked<Src, Dst>(src: Src) -> Dst {
-    use crate::mem::*;
-    // SAFETY: It's a transmute -- the caller promised it's fine.
-    unsafe { transmute_copy(&ManuallyDrop::new(src)) }
-}
-
-/// Polyfill for bootstrap
-#[cfg(bootstrap)]
-pub const unsafe fn write_via_move<T>(ptr: *mut T, value: T) {
-    use crate::mem::*;
-    // SAFETY: the caller must guarantee that `dst` is valid for writes.
-    // `dst` cannot overlap `src` because the caller has mutable access
-    // to `dst` while `src` is owned by this function.
-    unsafe {
-        copy_nonoverlapping::<T>(&value, ptr, 1);
-        forget(value);
-    }
-}

core/src/marker.rs

@@ -971,15 +971,14 @@ pub trait Tuple {}
 pub trait PointerLike {}
 
 /// A marker for types which can be used as types of `const` generic parameters.
-#[cfg_attr(not(bootstrap), lang = "const_param_ty")]
+#[lang = "const_param_ty"]
 #[unstable(feature = "adt_const_params", issue = "95174")]
 #[rustc_on_unimplemented(message = "`{Self}` can't be used as a const parameter type")]
 pub trait ConstParamTy: StructuralEq {}
 
 /// Derive macro generating an impl of the trait `ConstParamTy`.
 #[rustc_builtin_macro]
 #[unstable(feature = "adt_const_params", issue = "95174")]
-#[cfg(not(bootstrap))]
 pub macro ConstParamTy($item:item) {
     /* compiler built-in */
 }

core/src/mem/mod.rs

@@ -968,7 +968,7 @@ pub const fn replace<T>(dest: &mut T, src: T) -> T {
 /// Integers and other types implementing [`Copy`] are unaffected by `drop`.
 ///
 /// ```
-/// # #![cfg_attr(not(bootstrap), allow(dropping_copy_types))]
+/// # #![allow(dropping_copy_types)]
 /// #[derive(Copy, Clone)]
 /// struct Foo(u8);
 ///
@@ -1316,7 +1316,6 @@ impl<T> SizedTypeProperties for T {}
 ///
 /// assert_eq!(mem::offset_of!(NestedA, b.0), 0);
 /// ```
-#[cfg(not(bootstrap))]
 #[unstable(feature = "offset_of", issue = "106655")]
 #[allow_internal_unstable(builtin_syntax)]
 pub macro offset_of($Container:ty, $($fields:tt).+ $(,)?) {

core/src/num/nonzero.rs

@@ -769,8 +769,8 @@ macro_rules! nonzero_signed_operations {
                 /// ```
                 #[must_use]
                 #[inline]
-                #[stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
-                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
+                #[stable(feature = "nonzero_negation_ops", since = "1.71.0")]
+                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "1.71.0")]
                 pub const fn is_positive(self) -> bool {
                     self.get().is_positive()
                 }
@@ -794,8 +794,8 @@ macro_rules! nonzero_signed_operations {
                 /// ```
                 #[must_use]
                 #[inline]
-                #[stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
-                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
+                #[stable(feature = "nonzero_negation_ops", since = "1.71.0")]
+                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "1.71.0")]
                 pub const fn is_negative(self) -> bool {
                     self.get().is_negative()
                 }
@@ -819,8 +819,8 @@ macro_rules! nonzero_signed_operations {
                 /// # }
                 /// ```
                 #[inline]
-                #[stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
-                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
+                #[stable(feature = "nonzero_negation_ops", since = "1.71.0")]
+                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "1.71.0")]
                 pub const fn checked_neg(self) -> Option<$Ty> {
                     if let Some(result) = self.get().checked_neg() {
                         // SAFETY: negation of nonzero cannot yield zero values.
@@ -851,8 +851,8 @@ macro_rules! nonzero_signed_operations {
                 /// # }
                 /// ```
                 #[inline]
-                #[stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
-                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
+                #[stable(feature = "nonzero_negation_ops", since = "1.71.0")]
+                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "1.71.0")]
                 pub const fn overflowing_neg(self) -> ($Ty, bool) {
                     let (result, overflow) = self.get().overflowing_neg();
                     // SAFETY: negation of nonzero cannot yield zero values.
@@ -884,8 +884,8 @@ macro_rules! nonzero_signed_operations {
                 /// # }
                 /// ```
                 #[inline]
-                #[stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
-                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
+                #[stable(feature = "nonzero_negation_ops", since = "1.71.0")]
+                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "1.71.0")]
                 pub const fn saturating_neg(self) -> $Ty {
                     if let Some(result) = self.checked_neg() {
                         return result;
@@ -916,16 +916,16 @@ macro_rules! nonzero_signed_operations {
                 /// # }
                 /// ```
                 #[inline]
-                #[stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
-                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "CURRENT_RUSTC_VERSION")]
+                #[stable(feature = "nonzero_negation_ops", since = "1.71.0")]
+                #[rustc_const_stable(feature = "nonzero_negation_ops", since = "1.71.0")]
                 pub const fn wrapping_neg(self) -> $Ty {
                     let result = self.get().wrapping_neg();
                     // SAFETY: negation of nonzero cannot yield zero values.
                     unsafe { $Ty::new_unchecked(result) }
                 }
             }
 
-            #[stable(feature = "signed_nonzero_neg", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "signed_nonzero_neg", since = "1.71.0")]
             impl Neg for $Ty {
                 type Output = $Ty;
 
@@ -937,7 +937,7 @@ macro_rules! nonzero_signed_operations {
             }
 
             forward_ref_unop! { impl Neg, neg for $Ty,
-                #[stable(feature = "signed_nonzero_neg", since = "CURRENT_RUSTC_VERSION")] }
+                #[stable(feature = "signed_nonzero_neg", since = "1.71.0")] }
         )+
     }
 }

core/src/ptr/const_ptr.rs

@@ -916,16 +916,8 @@ impl<T: ?Sized> *const T {
     where
         T: Sized,
     {
-        #[cfg(bootstrap)]
         // SAFETY: the caller must uphold the safety contract for `offset`.
-        unsafe {
-            self.offset(count as isize)
-        }
-        #[cfg(not(bootstrap))]
-        // SAFETY: the caller must uphold the safety contract for `offset`.
-        unsafe {
-            intrinsics::offset(self, count)
-        }
+        unsafe { intrinsics::offset(self, count) }
     }
 
     /// Calculates the offset from a pointer in bytes (convenience for `.byte_offset(count as isize)`).
@@ -1195,7 +1187,7 @@ impl<T: ?Sized> *const T {
     ///
     /// [`ptr::read`]: crate::ptr::read()
     #[stable(feature = "pointer_methods", since = "1.26.0")]
-    #[rustc_const_stable(feature = "const_ptr_read", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "const_ptr_read", since = "1.71.0")]
     #[inline]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn read(self) -> T
@@ -1236,7 +1228,7 @@ impl<T: ?Sized> *const T {
     ///
     /// [`ptr::read_unaligned`]: crate::ptr::read_unaligned()
     #[stable(feature = "pointer_methods", since = "1.26.0")]
-    #[rustc_const_stable(feature = "const_ptr_read", since = "CURRENT_RUSTC_VERSION")]
+    #[rustc_const_stable(feature = "const_ptr_read", since = "1.71.0")]
     #[inline]
     #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn read_unaligned(self) -> T