{"ast_node_type":"function","tokens":[{"end":80,"kind":"keyword","start":0,"text":"fn"}]}
    fn visit_const_arg_unambig(&mut self, c: &'v ConstArg<'v>) -> Self::Result {
    /// discovery by IDes when `v.visit_const_arg` is written.
        walk_unambig_const_arg(self, c)