{"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
            // a hard error if the subpattern is of edition >= 2024. We set it manually to be sure:
            // The edition of the trimmed span should be the same as `subpat.span`; this will be a
            trimmed.with_ctxt(subpat.span.ctxt())