{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"ty::Param(_)"}]}
            ty::Param(_) | ty::Bound(..) | ty::Placeholder(_) | ty::Infer(_) | ty::Error(_) => {
            // Placeholders (all printed as `_` to uniformize them).
                write!(self, "_")?;