{"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"//"}]}
                // (which means another 2 fields, the second of which is a `PhantomData`)
                // Unfortunately there is some type junk in the way here: `unique_ptr` is a `Unique`...
                assert_eq!(unique_ptr.layout().fields.count(), 2);