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-rw-r--r--src/libcore/alloc.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/alloc.rs b/src/libcore/alloc.rs
index 5c24e3d8f5d..71517ffb006 100644
--- a/src/libcore/alloc.rs
+++ b/src/libcore/alloc.rs
@@ -100,6 +100,7 @@ impl Layout {
     /// This function is unsafe as it does not verify the preconditions from
     /// [`Layout::from_size_align`](#method.from_size_align).
     #[stable(feature = "alloc_layout", since = "1.28.0")]
+    #[cfg_attr(not(bootstrap), rustc_const_stable(feature = "alloc_layout", since = "1.28.0"))]
     #[inline]
     pub const unsafe fn from_size_align_unchecked(size: usize, align: usize) -> Self {
         Layout { size_: size, align_: NonZeroUsize::new_unchecked(align) }