{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"if"}]}
                if let Some(def_id) = t.trait_ref.trait_def_id() {
            hir::BoundConstness::Always(span) | hir::BoundConstness::Maybe(span) => {
                    self.tcx.check_const_stability(def_id, t.trait_ref.path.span, span);