netcdf test_struct_nested {
  types:
    compound s1_t {
      int x ;
      int y ;
    }; // s1_t
    compound s2_t {
      s1_t field1 ;
      s1_t field2 ;
    }; // s2_t
variables:
  s2_t x;
data:
  x = {{1,-2}, {255, 90}};
}