{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"ast::Pat::BoxPat(box_pat)"}]}
        ast::Pat::BoxPat(box_pat) => var_name_from_pat(&box_pat.pat()?),
        ast::Pat::RefPat(ref_pat) => var_name_from_pat(&ref_pat.pat()?),
        _ => None,