{"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"//"}]}
            // Ensure that our checks imply actual ABI compatibility for this concrete call.
        if self.layout_compat(caller_abi.layout, callee_abi.layout)? {
            // (This can fail e.g. if `#[rustc_nonnull_optimization_guaranteed]` is used incorrectly.)