{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"rhs_span:"}]}
                rhs_span: opt_rhs_expr.map(|expr| expr.span),
                rhs_hir_id: opt_rhs_expr.map(|expr| expr.hir_id),
                rhs_is_lit: opt_rhs_expr