{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"TyKind::Placeholder(idx)"}]}
        TyKind::Placeholder(idx) => Ok(Some(PointerKind::OfParam(*idx))),
        TyKind::Error => Ok(Some(PointerKind::Error)),
        TyKind::BoundVar(_) | TyKind::InferenceVar(..) => Ok(None),