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-rw-r--r--library/core/src/macros/mod.rs1
1 files changed, 0 insertions, 1 deletions
diff --git a/library/core/src/macros/mod.rs b/library/core/src/macros/mod.rs
index 488bb875c35..0cc428d6962 100644
--- a/library/core/src/macros/mod.rs
+++ b/library/core/src/macros/mod.rs
@@ -1003,7 +1003,6 @@ pub(crate) mod builtin {
     /// assert_eq!(s, b"ABCDEF");
     /// # }
     /// ```
-    #[cfg(not(bootstrap))]
     #[unstable(feature = "concat_bytes", issue = "87555")]
     #[rustc_builtin_macro]
     #[macro_export]