{"ast_node_type":"variable","tokens":[{"end":43,"kind":"keyword","start":0,"text":"let"}]}
        let old_type_span = self.type_span;
    fn visit_ty(&mut self, ty: &'tcx hir::Ty<'tcx, hir::AmbigArg>) -> Self::Result {
        let old_referenced_type_span = self.referenced_type_span;