fix

Author: saethlin

library/core/src/panic.rs

@@ -146,7 +146,7 @@ pub macro unreachable_2021 {
 /// not compromise unwind safety.
 #[doc(hidden)]
 #[unstable(feature = "panic_internals", issue = "none")]
-#[allow_internal_unstable(panic_internals, const_format_args)]
+#[allow_internal_unstable(panic_internals, const_format_args, delayed_debug_assertions)]
 #[rustc_macro_transparency = "semitransparent"]
 pub macro debug_assert_nounwind {
     ($cond:expr $(,)?) => {