error[E0658]: the `#[doc(rust_logo)]` attribute is used for Rust branding --> $DIR/doc-rust-logo.rs:1:8 | LL | #![doc(rust_logo)] | ^^^^^^^^^ | = note: see issue #90418 for more information = help: add `#![feature(rustdoc_internals)]` to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.