typedef struct Complex {
  double real;
  double imag;
} Complex;

typedef struct {
  int len;
  Complex data[];
} Vector;

int main() {
  Vector v;
  v.len = 1;
  v.data = (Complex[3])$lambda(int i) ((struct Complex) { 1.0 * i, 2.0 * i });
  $assert(v.data[1].real == 1.0 && v.data[1].imag == 2.0);
}