{"ast_node_type":"function","tokens":[{"end":82,"kind":"keyword","start":0,"text":"fn"}]}
        fn visit_ty(&mut self, t: &'tcx hir::Ty<'tcx, AmbigArg>) -> Self::Result {
        type Result = ControlFlow<()>;
            if let hir::TyKind::OpaqueDef(..) = t.kind {