Handle cfg(bootstrap) throughout

src/bootstrap/bin/rustc.rs

@@ -132,10 +132,7 @@ fn main() {
         cmd.arg("-Dwarnings");
         cmd.arg("-Drust_2018_idioms");
         cmd.arg("-Dunused_lifetimes");
-        // cfg(not(bootstrap)): Remove this during the next stage 0 compiler update.
-        // `-Drustc::internal` is a new feature and `rustc_version` mis-reports the `stage`.
-        let cfg_not_bootstrap = stage != "0" && crate_name != Some("rustc_version");
-        if cfg_not_bootstrap && use_internal_lints(crate_name) {
+        if use_internal_lints(crate_name) {
             cmd.arg("-Zunstable-options");
             cmd.arg("-Drustc::internal");
         }

src/bootstrap/builder.rs

@@ -145,7 +145,7 @@ impl StepDescription {
             only_hosts: S::ONLY_HOSTS,
             should_run: S::should_run,
             make_run: S::make_run,
-            name: unsafe { ::std::intrinsics::type_name::<S>() },
+            name: std::any::type_name::<S>(),
         }
     }
 

src/liballoc/collections/btree/node.rs

@@ -106,8 +106,8 @@ impl<K, V> LeafNode<K, V> {
         LeafNode {
             // As a general policy, we leave fields uninitialized if they can be, as this should
             // be both slightly faster and easier to track in Valgrind.
-            keys: uninit_array![_; CAPACITY],
-            vals: uninit_array![_; CAPACITY],
+            keys: [MaybeUninit::UNINIT; CAPACITY],
+            vals: [MaybeUninit::UNINIT; CAPACITY],
             parent: ptr::null(),
             parent_idx: MaybeUninit::uninit(),
             len: 0
@@ -159,7 +159,7 @@ impl<K, V> InternalNode<K, V> {
     unsafe fn new() -> Self {
         InternalNode {
             data: LeafNode::new(),
-            edges: uninit_array![_; 2*B],
+            edges: [MaybeUninit::UNINIT; 2*B]
         }
     }
 }

src/liballoc/lib.rs

@@ -69,7 +69,7 @@
 #![warn(missing_debug_implementations)]
 #![deny(intra_doc_link_resolution_failure)] // rustdoc is run without -D warnings
 #![allow(explicit_outlives_requirements)]
-#![cfg_attr(not(bootstrap), allow(incomplete_features))]
+#![allow(incomplete_features)]
 
 #![cfg_attr(not(test), feature(generator_trait))]
 #![cfg_attr(test, feature(test))]
@@ -84,7 +84,7 @@
 #![feature(coerce_unsized)]
 #![feature(const_generic_impls_guard)]
 #![feature(const_generics)]
-#![cfg_attr(not(bootstrap), feature(const_in_array_repeat_expressions))]
+#![feature(const_in_array_repeat_expressions)]
 #![feature(dispatch_from_dyn)]
 #![feature(core_intrinsics)]
 #![feature(dropck_eyepatch)]
@@ -118,7 +118,7 @@
 #![feature(rustc_const_unstable)]
 #![feature(const_vec_new)]
 #![feature(slice_partition_dedup)]
-#![feature(maybe_uninit_extra, maybe_uninit_slice, maybe_uninit_array)]
+#![feature(maybe_uninit_extra, maybe_uninit_slice)]
 #![feature(alloc_layout_extra)]
 #![feature(try_trait)]
 #![feature(mem_take)]

src/libcore/any.rs

@@ -470,10 +470,5 @@ impl TypeId {
 #[stable(feature = "type_name", since = "1.38.0")]
 #[rustc_const_unstable(feature = "const_type_name")]
 pub const fn type_name<T: ?Sized>() -> &'static str {
-    #[cfg(bootstrap)]
-    unsafe {
-        intrinsics::type_name::<T>()
-    }
-    #[cfg(not(bootstrap))]
     intrinsics::type_name::<T>()
 }

src/libcore/char/methods.rs

@@ -553,12 +553,7 @@ impl char {
     /// `XID_Start` is a Unicode Derived Property specified in
     /// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),
     /// mostly similar to `ID_Start` but modified for closure under `NFKx`.
-    #[cfg_attr(bootstrap,
-               unstable(feature = "rustc_private",
-                        reason = "mainly needed for compiler internals",
-                        issue = "27812"))]
-    #[cfg_attr(not(bootstrap),
-               unstable(feature = "unicode_internals", issue = "0"))]
+    #[unstable(feature = "unicode_internals", issue = "0")]
     pub fn is_xid_start(self) -> bool {
         derived_property::XID_Start(self)
     }
@@ -569,12 +564,7 @@ impl char {
     /// `XID_Continue` is a Unicode Derived Property specified in
     /// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),
     /// mostly similar to `ID_Continue` but modified for closure under NFKx.
-    #[cfg_attr(bootstrap,
-               unstable(feature = "rustc_private",
-                        reason = "mainly needed for compiler internals",
-                        issue = "27812"))]
-    #[cfg_attr(not(bootstrap),
-               unstable(feature = "unicode_internals", issue = "0"))]
+    #[unstable(feature = "unicode_internals", issue = "0")]
     #[inline]
     pub fn is_xid_continue(self) -> bool {
         derived_property::XID_Continue(self)

src/libcore/clone.rs

@@ -134,7 +134,6 @@ pub trait Clone : Sized {
 }
 
 /// Derive macro generating an impl of the trait `Clone`.
-#[cfg(not(bootstrap))]
 #[rustc_builtin_macro]
 #[rustc_macro_transparency = "semitransparent"]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]

src/libcore/cmp.rs

@@ -201,7 +201,6 @@ pub trait PartialEq<Rhs: ?Sized = Self> {
 }
 
 /// Derive macro generating an impl of the trait `PartialEq`.
-#[cfg(not(bootstrap))]
 #[rustc_builtin_macro]
 #[rustc_macro_transparency = "semitransparent"]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
@@ -265,7 +264,6 @@ pub trait Eq: PartialEq<Self> {
 }
 
 /// Derive macro generating an impl of the trait `Eq`.
-#[cfg(not(bootstrap))]
 #[rustc_builtin_macro]
 #[rustc_macro_transparency = "semitransparent"]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
@@ -617,7 +615,6 @@ pub trait Ord: Eq + PartialOrd<Self> {
 }
 
 /// Derive macro generating an impl of the trait `Ord`.
-#[cfg(not(bootstrap))]
 #[rustc_builtin_macro]
 #[rustc_macro_transparency = "semitransparent"]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
@@ -867,7 +864,6 @@ pub trait PartialOrd<Rhs: ?Sized = Self>: PartialEq<Rhs> {
 }
 
 /// Derive macro generating an impl of the trait `PartialOrd`.
-#[cfg(not(bootstrap))]
 #[rustc_builtin_macro]
 #[rustc_macro_transparency = "semitransparent"]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]

src/libcore/default.rs

@@ -116,7 +116,6 @@ pub trait Default: Sized {
 }
 
 /// Derive macro generating an impl of the trait `Default`.
-#[cfg(not(bootstrap))]
 #[rustc_builtin_macro]
 #[rustc_macro_transparency = "semitransparent"]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]

src/libcore/fmt/mod.rs

@@ -546,7 +546,6 @@ pub trait Debug {
 }
 
 // Separate module to reexport the macro `Debug` from prelude without the trait `Debug`.
-#[cfg(not(bootstrap))]
 pub(crate) mod macros {
     /// Derive macro generating an impl of the trait `Debug`.
     #[rustc_builtin_macro]
@@ -555,7 +554,6 @@ pub(crate) mod macros {
     #[allow_internal_unstable(core_intrinsics)]
     pub macro Debug($item:item) { /* compiler built-in */ }
 }
-#[cfg(not(bootstrap))]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[doc(inline)]
 pub use macros::Debug;

src/libcore/hash/mod.rs

@@ -199,7 +199,6 @@ pub trait Hash {
 }
 
 // Separate module to reexport the macro `Hash` from prelude without the trait `Hash`.
-#[cfg(not(bootstrap))]
 pub(crate) mod macros {
     /// Derive macro generating an impl of the trait `Hash`.
     #[rustc_builtin_macro]
@@ -208,7 +207,6 @@ pub(crate) mod macros {
     #[allow_internal_unstable(core_intrinsics)]
     pub macro Hash($item:item) { /* compiler built-in */ }
 }
-#[cfg(not(bootstrap))]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[doc(inline)]
 pub use macros::Hash;

src/libcore/lib.rs

@@ -63,7 +63,7 @@
 #![warn(missing_debug_implementations)]
 #![deny(intra_doc_link_resolution_failure)] // rustdoc is run without -D warnings
 #![allow(explicit_outlives_requirements)]
-#![cfg_attr(not(bootstrap), allow(incomplete_features))]
+#![allow(incomplete_features)]
 
 #![feature(allow_internal_unstable)]
 #![feature(arbitrary_self_types)]
@@ -129,7 +129,7 @@
 #![feature(structural_match)]
 #![feature(abi_unadjusted)]
 #![feature(adx_target_feature)]
-#![feature(maybe_uninit_slice, maybe_uninit_array)]
+#![feature(maybe_uninit_slice)]
 #![feature(external_doc)]
 #![feature(mem_take)]
 #![feature(associated_type_bounds)]

src/libcore/macros.rs

@@ -635,46 +635,11 @@ macro_rules! todo {
     ($($arg:tt)+) => (panic!("not yet implemented: {}", format_args!($($arg)+)));
 }
 
-/// Creates an array of [`MaybeUninit`].
-///
-/// This macro constructs an uninitialized array of the type `[MaybeUninit<K>; N]`.
-/// It exists solely because bootstrap does not yet support const array-init expressions.
-///
-/// [`MaybeUninit`]: mem/union.MaybeUninit.html
-// FIXME: Remove both versions of this macro once bootstrap is 1.38.
-#[macro_export]
-#[unstable(feature = "maybe_uninit_array", issue = "53491")]
-#[cfg(bootstrap)]
-macro_rules! uninit_array {
-    // This `assume_init` is safe because an array of `MaybeUninit` does not
-    // require initialization.
-    ($t:ty; $size:expr) => (unsafe {
-        MaybeUninit::<[MaybeUninit<$t>; $size]>::uninit().assume_init()
-    });
-}
-
-/// Creates an array of [`MaybeUninit`].
-///
-/// This macro constructs an uninitialized array of the type `[MaybeUninit<K>; N]`.
-/// It exists solely because bootstrap does not yet support const array-init expressions.
-///
-/// [`MaybeUninit`]: mem/union.MaybeUninit.html
-// FIXME: Just inline this version of the macro once bootstrap is 1.38.
-#[macro_export]
-#[unstable(feature = "maybe_uninit_array", issue = "53491")]
-#[cfg(not(bootstrap))]
-macro_rules! uninit_array {
-    ($t:ty; $size:expr) => (
-        [MaybeUninit::<$t>::UNINIT; $size]
-    );
-}
-
 /// Definitions of built-in macros.
 ///
 /// Most of the macro properties (stability, visibility, etc.) are taken from the source code here,
 /// with exception of expansion functions transforming macro inputs into outputs,
 /// those functions are provided by the compiler.
-#[cfg(not(bootstrap))]
 pub(crate) mod builtin {
 
     /// Causes compilation to fail with the given error message when encountered.

src/libcore/marker.rs

@@ -289,7 +289,6 @@ pub trait Copy : Clone {
 }
 
 /// Derive macro generating an impl of the trait `Copy`.
-#[cfg(not(bootstrap))]
 #[rustc_builtin_macro]
 #[rustc_macro_transparency = "semitransparent"]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]

src/libcore/mem/maybe_uninit.rs

@@ -213,7 +213,7 @@ use crate::mem::ManuallyDrop;
 #[allow(missing_debug_implementations)]
 #[stable(feature = "maybe_uninit", since = "1.36.0")]
 // Lang item so we can wrap other types in it. This is useful for generators.
-#[cfg_attr(not(bootstrap), lang = "maybe_uninit")]
+#[lang = "maybe_uninit"]
 #[derive(Copy)]
 #[repr(transparent)]
 pub union MaybeUninit<T> {

src/libcore/mem/mod.rs

@@ -453,7 +453,7 @@ pub const fn needs_drop<T>() -> bool {
 /// ```
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[cfg_attr(bootstrap, allow(deprecated_in_future))]
+#[allow(deprecated_in_future)]
 #[allow(deprecated)]
 pub unsafe fn zeroed<T>() -> T {
     intrinsics::panic_if_uninhabited::<T>();
@@ -481,7 +481,7 @@ pub unsafe fn zeroed<T>() -> T {
 #[inline]
 #[rustc_deprecated(since = "1.39.0", reason = "use `mem::MaybeUninit` instead")]
 #[stable(feature = "rust1", since = "1.0.0")]
-#[cfg_attr(bootstrap, allow(deprecated_in_future))]
+#[allow(deprecated_in_future)]
 #[allow(deprecated)]
 pub unsafe fn uninitialized<T>() -> T {
     intrinsics::panic_if_uninhabited::<T>();

src/libcore/prelude/v1.rs

@@ -46,16 +46,13 @@ pub use crate::option::Option::{self, Some, None};
 pub use crate::result::Result::{self, Ok, Err};
 
 // Re-exported built-in macros
-#[cfg(not(bootstrap))]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[doc(no_inline)]
 pub use crate::fmt::macros::Debug;
-#[cfg(not(bootstrap))]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[doc(no_inline)]
 pub use crate::hash::macros::Hash;
 
-#[cfg(not(bootstrap))]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[doc(no_inline)]
 pub use crate::{
@@ -83,7 +80,6 @@ pub use crate::{
     trace_macros,
 };
 
-#[cfg(not(bootstrap))]
 #[stable(feature = "builtin_macro_prelude", since = "1.38.0")]
 #[allow(deprecated)]
 #[doc(no_inline)]

src/librustc/lint/context.rs

@@ -1355,7 +1355,7 @@ struct LateLintPassObjects<'a> {
     lints: &'a mut [LateLintPassObject],
 }
 
-#[cfg_attr(not(bootstrap), allow(rustc::lint_pass_impl_without_macro))]
+#[allow(rustc::lint_pass_impl_without_macro)]
 impl LintPass for LateLintPassObjects<'_> {
     fn name(&self) -> &'static str {
         panic!()
@@ -1525,7 +1525,7 @@ struct EarlyLintPassObjects<'a> {
     lints: &'a mut [EarlyLintPassObject],
 }
 
-#[cfg_attr(not(bootstrap), allow(rustc::lint_pass_impl_without_macro))]
+#[allow(rustc::lint_pass_impl_without_macro)]
 impl LintPass for EarlyLintPassObjects<'_> {
     fn name(&self) -> &'static str {
         panic!()

src/librustc/lint/internal.rs

@@ -23,7 +23,7 @@ pub struct DefaultHashTypes {
 
 impl DefaultHashTypes {
     // we are allowed to use `HashMap` and `HashSet` as identifiers for implementing the lint itself
-    #[cfg_attr(not(bootstrap), allow(rustc::default_hash_types))]
+    #[allow(rustc::default_hash_types)]
     pub fn new() -> Self {
         let mut map = FxHashMap::default();
         map.insert(sym::HashMap, sym::FxHashMap);

src/librustc/ty/codec.rs

@@ -27,7 +27,7 @@ pub trait EncodableWithShorthand: Clone + Eq + Hash {
     fn variant(&self) -> &Self::Variant;
 }
 
-#[cfg_attr(not(bootstrap), allow(rustc::usage_of_ty_tykind))]
+#[allow(rustc::usage_of_ty_tykind)]
 impl<'tcx> EncodableWithShorthand for Ty<'tcx> {
     type Variant = ty::TyKind<'tcx>;
     fn variant(&self) -> &Self::Variant {
@@ -160,7 +160,7 @@ where
     Ok(decoder.map_encoded_cnum_to_current(cnum))
 }
 
-#[cfg_attr(not(bootstrap), allow(rustc::usage_of_ty_tykind))]
+#[allow(rustc::usage_of_ty_tykind)]
 #[inline]
 pub fn decode_ty<D>(decoder: &mut D) -> Result<Ty<'tcx>, D::Error>
 where

src/librustc/ty/context.rs

@@ -130,7 +130,7 @@ impl<'tcx> CtxtInterners<'tcx> {
     }
 
     /// Intern a type
-    #[cfg_attr(not(bootstrap), allow(rustc::usage_of_ty_tykind))]
+    #[allow(rustc::usage_of_ty_tykind)]
     #[inline(never)]
     fn intern_ty(&self,
         st: TyKind<'tcx>
@@ -2076,7 +2076,7 @@ impl<'tcx> Hash for Interned<'tcx, TyS<'tcx>> {
     }
 }
 
-#[cfg_attr(not(bootstrap), allow(rustc::usage_of_ty_tykind))]
+#[allow(rustc::usage_of_ty_tykind)]
 impl<'tcx> Borrow<TyKind<'tcx>> for Interned<'tcx, TyS<'tcx>> {
     fn borrow<'a>(&'a self) -> &'a TyKind<'tcx> {
         &self.0.sty
@@ -2291,7 +2291,7 @@ impl<'tcx> TyCtxt<'tcx> {
         self.mk_fn_ptr(converted_sig)
     }
 
-    #[cfg_attr(not(bootstrap), allow(rustc::usage_of_ty_tykind))]
+    #[allow(rustc::usage_of_ty_tykind)]
     #[inline]
     pub fn mk_ty(&self, st: TyKind<'tcx>) -> Ty<'tcx> {
         self.interners.intern_ty(st)