cfg stuff

Cargo.toml

@@ -46,6 +46,9 @@ std_instead_of_core = "warn"
 std_instead_of_alloc = "warn"
 alloc_instead_of_core = "warn"
 
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(docsrs_dep)'] }
+
 [workspace.lints.rust]
 missing_docs = "warn"
 unexpected_cfgs = { level = "warn", check-cfg = ['cfg(docsrs_dep)'] }

src/lib.rs

@@ -1,6 +1,6 @@
 // FIXME(15321): solve CI failures, then replace with `#![expect()]`.
 #![allow(missing_docs, reason = "Not all docs are written yet, see #3492.")]
-#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![cfg_attr(any(docsrs, docsrs_dep), feature(doc_auto_cfg, rustdoc_internals))]
 
 use proc_macro::TokenStream;
 use proc_macro2::{Literal, Span as Span2, TokenStream as TokenStream2};