(unstable, auto_traits, "1.50.0", Some(13231)),

/// Allows using `box` in patterns (RFC 469).

(unstable, box_patterns, "1.0.0", Some(29641)),

/// Allows builtin # foo() syntax

(internal, builtin_syntax, "1.71.0", Some(110680)),

/// Allows `#[doc(notable_trait)]`.

/// Renamed from `doc_spotlight`.

(unstable, doc_notable_trait, "1.52.0", Some(45040)),

(unstable, async_fn_track_caller, "1.73.0", Some(110011)),

/// Allows `for await` loops.

(unstable, async_for_loop, "1.77.0", Some(118898)),

/// Allows builtin # foo() syntax

(unstable, builtin_syntax, "1.71.0", Some(110680)),

/// Allows using C-variadics.

(unstable, c_variadic, "1.34.0", Some(44930)),

/// Allows the use of `#[cfg(overflow_checks)` to check if integer overflow behaviour.