2 files changed, 4 insertions, 4 deletions
diff --git a/library/core/src/alloc/layout.rs b/library/core/src/alloc/layout.rs
index f03502429..920e559cc 100644
--- a/library/core/src/alloc/layout.rs
+++ b/library/core/src/alloc/layout.rs
@@ -5,7 +5,6 @@
 // Your performance intuition is useless. Run perf.
 
 use crate::cmp;
-#[cfg(not(bootstrap))]
 use crate::error::Error;
 use crate::fmt;
 use crate::mem::{self, ValidAlign};
@@ -65,6 +64,7 @@ impl Layout {
     #[stable(feature = "alloc_layout", since = "1.28.0")]
     #[rustc_const_stable(feature = "const_alloc_layout_size_align", since = "1.50.0")]
     #[inline]
+    #[rustc_allow_const_fn_unstable(ptr_alignment_type)]
     pub const fn from_size_align(size: usize, align: usize) -> Result<Self, LayoutError> {
         if !align.is_power_of_two() {
             return Err(LayoutError);
@@ -114,6 +114,7 @@ impl Layout {
     #[rustc_const_stable(feature = "const_alloc_layout_unchecked", since = "1.36.0")]
     #[must_use]
     #[inline]
+    #[rustc_allow_const_fn_unstable(ptr_alignment_type)]
     pub const unsafe fn from_size_align_unchecked(size: usize, align: usize) -> Self {
         // SAFETY: the caller is required to uphold the preconditions.
         unsafe { Layout { size, align: ValidAlign::new_unchecked(align) } }
@@ -134,6 +135,7 @@ impl Layout {
     #[must_use = "this returns the minimum alignment, \
                   without modifying the layout"]
     #[inline]
+    #[rustc_allow_const_fn_unstable(ptr_alignment_type)]
     pub const fn align(&self) -> usize {
         self.align.as_usize()
     }
@@ -463,7 +465,6 @@ pub type LayoutErr = LayoutError;
 #[derive(Clone, PartialEq, Eq, Debug)]
 pub struct LayoutError;
 
-#[cfg(not(bootstrap))]
 #[stable(feature = "alloc_layout", since = "1.28.0")]
 impl Error for LayoutError {}
 
diff --git a/library/core/src/alloc/mod.rs b/library/core/src/alloc/mod.rs
index 94efa7666..a4bf6a853 100644
--- a/library/core/src/alloc/mod.rs
+++ b/library/core/src/alloc/mod.rs
@@ -21,7 +21,6 @@ pub use self::layout::LayoutErr;
 #[stable(feature = "alloc_layout_error", since = "1.50.0")]
 pub use self::layout::LayoutError;
 
-#[cfg(not(bootstrap))]
 use crate::error::Error;
 use crate::fmt;
 use crate::ptr::{self, NonNull};
@@ -34,7 +33,6 @@ use crate::ptr::{self, NonNull};
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub struct AllocError;
 
-#[cfg(not(bootstrap))]
 #[unstable(
     feature = "allocator_api",
     reason = "the precise API and guarantees it provides may be tweaked.",
@@ -107,6 +105,7 @@ impl fmt::Display for AllocError {
 ///
 /// [*currently allocated*]: #currently-allocated-memory
 #[unstable(feature = "allocator_api", issue = "32838")]
+#[const_trait]
 pub unsafe trait Allocator {
     /// Attempts to allocate a block of memory.
     ///