allow_internal_unstable(min_specialization) on newtype_index

compiler/rustc_index_macros/src/lib.rs

@@ -36,6 +36,9 @@ mod newtype;
     feature = "nightly",
     allow_internal_unstable(step_trait, rustc_attrs, trusted_step, spec_option_partial_eq)
 )]
+// FIXME: Remove the above comment about `min_specialization` once bootstrap is bumped,
+// and the corresponding one on SpecOptionPartialEq
+#[cfg_attr(all(feature = "nightly", not(bootstrap)), allow_internal_unstable(min_specialization))]
 pub fn newtype_index(input: TokenStream) -> TokenStream {
     newtype::newtype(input)
 }