Bump stage0 compiler to 1.56

compiler/rustc_ast/src/lib.rs

@@ -9,14 +9,12 @@
     test(attr(deny(warnings)))
 )]
 #![feature(box_patterns)]
-#![cfg_attr(bootstrap, feature(const_fn_transmute))]
 #![feature(crate_visibility_modifier)]
 #![feature(if_let_guard)]
 #![feature(iter_zip)]
 #![feature(label_break_value)]
 #![feature(nll)]
 #![feature(min_specialization)]
-#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 #![recursion_limit = "256"]
 
 #[macro_use]

compiler/rustc_ast_passes/src/lib.rs

@@ -4,7 +4,6 @@
 //!
 //! The crate also contains other misc AST visitors, e.g. `node_count` and `show_span`.
 
-#![cfg_attr(bootstrap, feature(bindings_after_at))]
 #![feature(iter_is_partitioned)]
 #![feature(box_patterns)]
 #![recursion_limit = "256"]

compiler/rustc_const_eval/src/lib.rs

@@ -5,7 +5,6 @@ Rust MIR: a lowered representation of Rust.
 */
 
 #![feature(assert_matches)]
-#![cfg_attr(bootstrap, feature(bindings_after_at))]
 #![feature(bool_to_option)]
 #![feature(box_patterns)]
 #![feature(control_flow_enum)]

compiler/rustc_data_structures/src/lib.rs

@@ -21,8 +21,7 @@
 #![feature(iter_map_while)]
 #![feature(maybe_uninit_uninit_array)]
 #![feature(min_specialization)]
-#![cfg_attr(bootstrap, feature(min_type_alias_impl_trait))]
-#![cfg_attr(not(bootstrap), feature(type_alias_impl_trait))]
+#![feature(type_alias_impl_trait)]
 #![feature(new_uninit)]
 #![feature(nll)]
 #![feature(once_cell)]

compiler/rustc_errors/src/lib.rs

@@ -9,7 +9,6 @@
 #![feature(format_args_capture)]
 #![feature(iter_zip)]
 #![feature(nll)]
-#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 
 #[macro_use]
 extern crate rustc_macros;

compiler/rustc_expand/src/lib.rs

@@ -1,4 +1,3 @@
-#![cfg_attr(bootstrap, feature(bindings_after_at))]
 #![feature(crate_visibility_modifier)]
 #![feature(decl_macro)]
 #![feature(destructuring_assignment)]
@@ -9,7 +8,6 @@
 #![feature(proc_macro_internals)]
 #![feature(proc_macro_span)]
 #![feature(try_blocks)]
-#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 #![recursion_limit = "256"]
 
 #[macro_use]

compiler/rustc_middle/src/lib.rs

@@ -56,7 +56,6 @@
 #![feature(try_reserve)]
 #![feature(try_reserve_kind)]
 #![feature(nonzero_ops)]
-#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 #![recursion_limit = "512"]
 
 #[macro_use]

compiler/rustc_mir_transform/src/lib.rs

@@ -1,4 +1,3 @@
-#![cfg_attr(bootstrap, feature(bindings_after_at))]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(crate_visibility_modifier)]

compiler/rustc_parse/src/lib.rs

@@ -3,9 +3,7 @@
 #![feature(array_windows)]
 #![feature(crate_visibility_modifier)]
 #![feature(if_let_guard)]
-#![cfg_attr(bootstrap, feature(bindings_after_at))]
 #![feature(box_patterns)]
-#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 #![recursion_limit = "256"]
 
 use rustc_ast as ast;

compiler/rustc_save_analysis/src/lib.rs

@@ -1,7 +1,6 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![feature(if_let_guard)]
 #![feature(nll)]
-#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 #![recursion_limit = "256"]
 
 mod dump_visitor;

compiler/rustc_span/src/lib.rs

@@ -21,7 +21,6 @@
 #![feature(nll)]
 #![feature(min_specialization)]
 #![feature(thread_local_const_init)]
-#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 
 #[macro_use]
 extern crate rustc_macros;

compiler/rustc_typeck/src/lib.rs

@@ -56,7 +56,6 @@ This API is completely unstable and subject to change.
 */
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![cfg_attr(bootstrap, feature(bindings_after_at))]
 #![feature(bool_to_option)]
 #![feature(crate_visibility_modifier)]
 #![feature(format_args_capture)]
@@ -69,7 +68,6 @@ This API is completely unstable and subject to change.
 #![feature(never_type)]
 #![feature(slice_partition_dedup)]
 #![feature(control_flow_enum)]
-#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 #![recursion_limit = "256"]
 
 #[macro_use]

library/alloc/src/lib.rs

@@ -85,7 +85,6 @@
 #![feature(allow_internal_unstable)]
 #![feature(arbitrary_self_types)]
 #![feature(async_stream)]
-#![cfg_attr(bootstrap, feature(bindings_after_at))]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(cfg_sanitize)]
@@ -143,8 +142,6 @@
 #![feature(alloc_layout_extra)]
 #![feature(trusted_random_access)]
 #![feature(try_trait_v2)]
-#![cfg_attr(bootstrap, feature(min_type_alias_impl_trait))]
-#![cfg_attr(not(bootstrap), feature(type_alias_impl_trait))]
 #![feature(associated_type_bounds)]
 #![feature(slice_group_by)]
 #![feature(decl_macro)]

library/core/src/fmt/mod.rs

@@ -333,7 +333,6 @@ enum FlagV1 {
 impl<'a> Arguments<'a> {
     /// When using the format_args!() macro, this function is used to generate the
     /// Arguments structure.
-    #[cfg(not(bootstrap))]
     #[doc(hidden)]
     #[inline]
     #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")]
@@ -347,25 +346,13 @@ impl<'a> Arguments<'a> {
         }
         Arguments { pieces, fmt: None, args }
     }
-    #[cfg(bootstrap)]
-    #[doc(hidden)]
-    #[inline]
-    #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")]
-    #[rustc_const_unstable(feature = "const_fmt_arguments_new", issue = "none")]
-    pub const fn new_v1(pieces: &'a [&'static str], args: &'a [ArgumentV1<'a>]) -> Arguments<'a> {
-        if pieces.len() < args.len() || pieces.len() > args.len() + 1 {
-            panic!("invalid args");
-        }
-        Arguments { pieces, fmt: None, args }
-    }
 
     /// This function is used to specify nonstandard formatting parameters.
     /// The `pieces` array must be at least as long as `fmt` to construct
     /// a valid Arguments structure. Also, any `Count` within `fmt` that is
     /// `CountIsParam` or `CountIsNextParam` has to point to an argument
     /// created with `argumentusize`. However, failing to do so doesn't cause
     /// unsafety, but will ignore invalid .
-    #[cfg(not(bootstrap))]
     #[doc(hidden)]
     #[inline]
     #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")]
@@ -377,18 +364,6 @@ impl<'a> Arguments<'a> {
     ) -> Arguments<'a> {
         Arguments { pieces, fmt: Some(fmt), args }
     }
-    #[cfg(bootstrap)]
-    #[doc(hidden)]
-    #[inline]
-    #[unstable(feature = "fmt_internals", reason = "internal to format_args!", issue = "none")]
-    #[rustc_const_unstable(feature = "const_fmt_arguments_new", issue = "none")]
-    pub const fn new_v1_formatted(
-        pieces: &'a [&'static str],
-        args: &'a [ArgumentV1<'a>],
-        fmt: &'a [rt::v1::Argument],
-    ) -> Arguments<'a> {
-        Arguments { pieces, fmt: Some(fmt), args }
-    }
 
     /// Estimates the length of the formatted text.
     ///

library/core/src/hint.rs

@@ -154,18 +154,6 @@ pub fn spin_loop() {
 /// [`std::convert::identity`]: crate::convert::identity
 #[inline]
 #[unstable(feature = "bench_black_box", issue = "64102")]
-#[cfg_attr(not(bootstrap), allow(unused_mut))]
-#[cfg_attr(bootstrap, allow(deprecated))]
-pub fn black_box<T>(mut dummy: T) -> T {
-    #[cfg(bootstrap)]
-    // SAFETY: the inline assembly is a no-op.
-    unsafe {
-        llvm_asm!("" : : "r"(&mut dummy) : "memory" : "volatile");
-        dummy
-    }
-
-    #[cfg(not(bootstrap))]
-    {
-        crate::intrinsics::black_box(dummy)
-    }
+pub fn black_box<T>(dummy: T) -> T {
+    crate::intrinsics::black_box(dummy)
 }

library/core/src/intrinsics.rs

@@ -1937,7 +1937,6 @@ extern "rust-intrinsic" {
     /// See documentation of [`std::hint::black_box`] for details.
     ///
     /// [`std::hint::black_box`]: crate::hint::black_box
-    #[cfg(not(bootstrap))]
     pub fn black_box<T>(dummy: T) -> T;
 }
 

library/core/src/lib.rs

@@ -69,7 +69,6 @@
 #![warn(missing_debug_implementations)]
 #![warn(missing_docs)]
 #![allow(explicit_outlives_requirements)]
-#![cfg_attr(bootstrap, allow(incomplete_features))] // if_let_guard
 //
 // Library features for const fns:
 #![feature(const_align_of_val)]
@@ -122,8 +121,6 @@
 #![feature(const_fn_floating_point_arithmetic)]
 #![feature(const_fn_fn_ptr_basics)]
 #![feature(const_fn_trait_bound)]
-#![cfg_attr(bootstrap, feature(const_fn_transmute))]
-#![cfg_attr(bootstrap, feature(const_fn_union))]
 #![feature(const_impl_trait)]
 #![feature(const_mut_refs)]
 #![feature(const_panic)]

library/core/src/macros/mod.rs

@@ -842,7 +842,6 @@ pub(crate) mod builtin {
     /// This macro is used by the panic macros for the `const_panic` feature.
     ///
     /// This macro will be removed once `format_args` is allowed in const contexts.
-    #[cfg(not(bootstrap))]
     #[unstable(feature = "const_format_args", issue = "none")]
     #[allow_internal_unstable(fmt_internals, const_fmt_arguments_new)]
     #[rustc_builtin_macro]
@@ -852,16 +851,6 @@ pub(crate) mod builtin {
         ($fmt:expr, $($args:tt)*) => {{ /* compiler built-in */ }};
     }
 
-    /// Same as `format_args`, but can be used in some const contexts.
-    #[cfg(bootstrap)]
-    #[unstable(feature = "const_format_args", issue = "none")]
-    #[macro_export]
-    macro_rules! const_format_args {
-        ($($t:tt)*) => {
-            $crate::format_args!($($t)*)
-        }
-    }
-
     /// Same as `format_args`, but adds a newline in the end.
     #[unstable(
         feature = "format_args_nl",

library/core/src/num/int_macros.rs

@@ -2350,7 +2350,6 @@ macro_rules! int_impl {
         #[rustc_const_stable(feature = "const_int_conversion", since = "1.44.0")]
         // SAFETY: const sound because integers are plain old datatypes so we can always
         // transmute them to arrays of bytes
-        #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_fn_transmute))]
         #[inline]
         pub const fn to_ne_bytes(self) -> [u8; mem::size_of::<Self>()] {
             // SAFETY: integers are plain old datatypes so we can always transmute them to
@@ -2456,7 +2455,6 @@ macro_rules! int_impl {
         #[rustc_const_stable(feature = "const_int_conversion", since = "1.44.0")]
         // SAFETY: const sound because integers are plain old datatypes so we can always
         // transmute to them
-        #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_fn_transmute))]
         #[inline]
         pub const fn from_ne_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
             // SAFETY: integers are plain old datatypes so we can always transmute to them

library/core/src/num/uint_macros.rs

@@ -2119,7 +2119,6 @@ macro_rules! uint_impl {
         #[rustc_const_stable(feature = "const_int_conversion", since = "1.44.0")]
         // SAFETY: const sound because integers are plain old datatypes so we can always
         // transmute them to arrays of bytes
-        #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_fn_transmute))]
         #[inline]
         pub const fn to_ne_bytes(self) -> [u8; mem::size_of::<Self>()] {
             // SAFETY: integers are plain old datatypes so we can always transmute them to
@@ -2225,7 +2224,6 @@ macro_rules! uint_impl {
         #[rustc_const_stable(feature = "const_int_conversion", since = "1.44.0")]
         // SAFETY: const sound because integers are plain old datatypes so we can always
         // transmute to them
-        #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_fn_transmute))]
         #[inline]
         pub const fn from_ne_bytes(bytes: [u8; mem::size_of::<Self>()]) -> Self {
             // SAFETY: integers are plain old datatypes so we can always transmute to them

library/core/src/panicking.rs

@@ -48,13 +48,8 @@ pub fn panic(expr: &'static str) -> ! {
     // Arguments::new_v1 may allow the compiler to omit Formatter::pad from the
     // output binary, saving up to a few kilobytes.
     panic_fmt(
-        #[cfg(bootstrap)]
-        fmt::Arguments::new_v1(&[expr], &[]),
-        #[cfg(not(bootstrap))]
         // SAFETY: Arguments::new_v1 is safe with exactly one str and zero args
-        unsafe {
-            fmt::Arguments::new_v1(&[expr], &[])
-        },
+        unsafe { fmt::Arguments::new_v1(&[expr], &[]) },
     );
 }
 
@@ -82,7 +77,7 @@ fn panic_bounds_check(index: usize, len: usize) -> ! {
 #[cfg_attr(not(feature = "panic_immediate_abort"), inline(never))]
 #[cfg_attr(feature = "panic_immediate_abort", inline)]
 #[track_caller]
-#[cfg_attr(not(bootstrap), lang = "panic_fmt")] // needed for const-evaluated panics
+#[lang = "panic_fmt"] // needed for const-evaluated panics
 pub fn panic_fmt(fmt: fmt::Arguments<'_>) -> ! {
     if cfg!(feature = "panic_immediate_abort") {
         super::intrinsics::abort()
@@ -102,7 +97,6 @@ pub fn panic_fmt(fmt: fmt::Arguments<'_>) -> ! {
 }
 
 /// This function is used instead of panic_fmt in const eval.
-#[cfg(not(bootstrap))]
 #[lang = "const_panic_fmt"]
 pub const fn const_panic_fmt(fmt: fmt::Arguments<'_>) -> ! {
     if let Some(msg) = fmt.as_str() {

library/core/src/slice/mod.rs

@@ -98,7 +98,6 @@ impl<T> [T] {
     #[rustc_const_stable(feature = "const_slice_len", since = "1.39.0")]
     #[inline]
     // SAFETY: const sound because we transmute out the length field as a usize (which it must be)
-    #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_fn_union))]
     pub const fn len(&self) -> usize {
         // FIXME: Replace with `crate::ptr::metadata(self)` when that is const-stable.
         // As of this writing this causes a "Const-stable functions can only call other

library/core/src/str/converts.rs

@@ -157,7 +157,6 @@ pub fn from_utf8_mut(v: &mut [u8]) -> Result<&mut str, Utf8Error> {
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_const_stable(feature = "const_str_from_utf8_unchecked", since = "1.55.0")]
-#[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_fn_transmute))]
 pub const unsafe fn from_utf8_unchecked(v: &[u8]) -> &str {
     // SAFETY: the caller must guarantee that the bytes `v` are valid UTF-8.
     // Also relies on `&str` and `&[u8]` having the same layout.

library/core/src/str/mod.rs

@@ -231,7 +231,6 @@ impl str {
     #[rustc_const_stable(feature = "str_as_bytes", since = "1.39.0")]
     #[inline(always)]
     #[allow(unused_attributes)]
-    #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_fn_transmute))]
     pub const fn as_bytes(&self) -> &[u8] {
         // SAFETY: const sound because we transmute two types with the same layout
         unsafe { mem::transmute(self) }

library/std/src/lib.rs

@@ -247,7 +247,6 @@
 #![feature(const_cstr_unchecked)]
 #![feature(const_fn_floating_point_arithmetic)]
 #![feature(const_fn_fn_ptr_basics)]
-#![cfg_attr(bootstrap, feature(const_fn_transmute))]
 #![feature(const_format_args)]
 #![feature(const_io_structs)]
 #![feature(const_ip)]
@@ -265,7 +264,7 @@
 #![feature(doc_keyword)]
 #![feature(doc_masked)]
 #![feature(doc_notable_trait)]
-#![cfg_attr(not(bootstrap), feature(doc_primitive))]
+#![feature(doc_primitive)]
 #![feature(dropck_eyepatch)]
 #![feature(duration_checked_float)]
 #![feature(duration_constants)]

library/std/src/net/ip.rs

@@ -1166,7 +1166,6 @@ impl Ipv6Addr {
     ///
     /// let addr = Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff);
     /// ```
-    #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_fn_transmute))]
     #[rustc_const_stable(feature = "const_ipv6", since = "1.32.0")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
@@ -1228,7 +1227,6 @@ impl Ipv6Addr {
     /// assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).segments(),
     ///            [0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff]);
     /// ```
-    #[cfg_attr(bootstrap, rustc_allow_const_fn_unstable(const_fn_transmute))]
     #[rustc_const_stable(feature = "const_ipv6", since = "1.50.0")]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]

library/std/src/panicking.rs

@@ -450,7 +450,7 @@ pub fn panicking() -> bool {
 #[cfg_attr(not(feature = "panic_immediate_abort"), track_caller)]
 #[cfg_attr(not(feature = "panic_immediate_abort"), inline(never))]
 #[cfg_attr(feature = "panic_immediate_abort", inline)]
-#[cfg_attr(all(not(bootstrap), not(test)), lang = "begin_panic_fmt")]
+#[cfg_attr(not(test), lang = "begin_panic_fmt")]
 pub fn begin_panic_fmt(msg: &fmt::Arguments<'_>) -> ! {
     if cfg!(feature = "panic_immediate_abort") {
         intrinsics::abort()

library/std/src/primitive_docs.rs

@@ -615,8 +615,7 @@ mod prim_pointer {}
 /// Starting in the 2021 edition, `array.into_iter()` uses `IntoIterator` normally to iterate
 /// by value, and `iter()` should be used to iterate by reference like previous editions.
 ///
-#[cfg_attr(bootstrap, doc = "```rust,edition2021,ignore")]
-#[cfg_attr(not(bootstrap), doc = "```rust,edition2021")]
+/// ```rust,edition2021
 /// // Rust 2021:
 ///
 /// let array: [i32; 3] = [0; 3];