{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"debug_assert!(!r.is_bound(),"}]}
        debug_assert!(!r.is_bound(), "Should not be resolving bound region.");
    fn fold_region(&mut self, r: ty::Region<'tcx>) -> ty::Region<'tcx> {
        self.fcx.tcx.lifetimes.re_erased