{"ast_node_type":"other","tokens":[{"end":102,"kind":"keyword","start":0,"text":"//"}]}
            // (This can fail e.g. if `#[rustc_nonnull_optimization_guaranteed]` is used incorrectly.)
            // Ensure that our checks imply actual ABI compatibility for this concrete call.
            assert!(caller_abi.eq_abi(callee_abi));