{"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"enter_wf_checking_ctxt(tcx,"}]}
    enter_wf_checking_ctxt(tcx, def_id, |wfcx| {
) -> Result<(), ErrorGuaranteed> {
        let sig = tcx.fn_sig(def_id).instantiate_identity();