{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"//"}]}
            //     we get spurious errors (`ui/regions-lub-ref-ref-rc.rs`).
            //     The pointer we want is `LUB('x, 'b`). If we choose `LUB('a,'b)`
            //     (The errors actually show up in borrowck, typically, because