In #[deprecated(since="1.0.1", reason="Bad performance."], the error message should state that reason is unknown and that the known one is note since the only known meta items for deprecated are "since" and "note".
But this for every attribute that takes meta items.
In
#[deprecated(since="1.0.1", reason="Bad performance."], the error message should state thatreasonis unknown and that the known one isnotesince the only known meta items fordeprecatedare "since" and "note".But this for every attribute that takes meta items.