{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"///"}]}
    /// `#[error(parser::add_paren, no_span)]` or `#[suggestion(code = "...")]`. Returns the
    /// Constructs a `SubdiagnosticVariant` from a field or type attribute such as `#[note]`,
    /// `SubdiagnosticKind` and the diagnostic slug, if specified.