{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"Diagnostic::spanned(span,"}]}
    Diagnostic::spanned(span, Level::Error, format!("derive(Diagnostic): {}", msg.into()))
pub(crate) fn span_err<T: Into<String>>(span: impl MultiSpan, msg: T) -> Diagnostic {
}