error with directly subsetting an implicit vector

[paciorek]

     go = nFunction(
        fun = function() {
            y <- rbeta(1,1,1)[1]
          return(y)
        },
        returnType = 'numericScalar'
      )
cgo <- nCompile(go)

nCompiler_units_12.cpp:26:114: error: no match for ‘operator[]’ (operand types are ‘recyclingGenerator<double(double, double), double, Eigen::Tensor<double, 1>, Eigen::Tensor<double, 1, 0, long int> >::GeneratorXprType’ {aka ‘Eigen::TensorCwiseRecyclingFunctorOp<double(double, double), Eigen::TensorCwiseRecyclingOp<Eigen::Tensor<double, 1>, Eigen::TensorMap<Eigen::Tensor<double, 1> > >, Eigen::TensorCwiseRecyclingOp<Eigen::Tensor<double, 1, 0, long int>, Eigen::TensorMap<Eigen::Tensor<double, 1, 0, long int>, 0, Eigen::MakePointer> > >’} and ‘long int’)
   26 | flex_(y) = nCompiler::tensorArgDist::rbeta(1.0, createTensor<double, 1>(1.0, 1), createTensor<double, 1>(1.0, 1))[(static_cast<long>(1.0)) - 1];
      |                                                                                                                  ^