`doc_cfg` / `doc_auto_cfg` thinks `any(true)` and `any(all())` are available nowhere

[SabrinaJewson]

I tried this code:

#![feature(doc_auto_cfg)]
#[cfg(any(all()))]
pub fn f() {}

and:

#![feature(doc_auto_cfg)]
#[cfg(any(true))]
pub fn f() {}

I expected to see this happen: No doc_auto_cfg message appears in the documentation.

Instead, this happened:

For a workaround, not(all(false)) seems to work fine.

Meta

rustc --version --verbose:

rustc 1.91.0-nightly (7d82b83ed 2025-08-06)
binary: rustc
commit-hash: 7d82b83ed57d188ab3f2441a765a6419685a88a3
commit-date: 2025-08-06
host: x86_64-unknown-linux-gnu
release: 1.91.0-nightly
LLVM version: 21.1.0

[fmease]

Also affects regular doc_cfg: #[doc(cfg(any(true)))] and #[doc(cfg(any(all())))] exhibits the same bug.