{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"if"}]}
        if let Res::Def(DefKind::Trait, trait_did) = t.path.res {
    fn visit_trait_ref(&mut self, t: &'tcx TraitRef<'tcx>) {
            if let Some(stab) = self.tcx.lookup_stability(trait_did) {