{"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"_"}]}
            _ if layout.is_zst() => Immediate::Uninit,
            // (Scalar/ScalarPair can contain even aligned ZST, not just 1-ZST)
            // some fieldless enum variants can have non-zero size but still `Aggregate` ABI... try