{"ast_node_type":"function","tokens":[{"end":84,"kind":"keyword","start":0,"text":"fn"}]}
    fn cat_rvalue(&self, hir_id: HirId, expr_ty: Ty<'tcx>) -> PlaceWithHirId<'tcx> {
        PlaceWithHirId::new(hir_id, expr_ty, PlaceBase::Rvalue, Vec::new())