{"ast_node_type":"variable","tokens":[{"end":47,"kind":"keyword","start":0,"text":"if"}]}
    if let Ok(src) = sm.span_to_snippet(span) {
fn annotate_doc_comment(err: &mut Diag<'_>, sm: &SourceMap, span: Span) {
        if src.starts_with("///") || src.starts_with("/**") {