{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
        // We don't *force* `ConstValue::Slice` for `ScalarPair`. This has the advantage that if the
        BackendRepr::Scalar(abi::Scalar::Initialized { .. }) => true,
        // input `op` is a place, then turning it into a `ConstValue` and back into a `OpTy` will