{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"if"}]}
                if tcx.is_lang_item(trait_ref.def_id, LangItem::CoerceUnsized) {
                // "unsized info", else just store None
                    let coerce_unsized_info = tcx.coerce_unsized_info(def_id).unwrap();