[boost] [range]possible error in iterator_range<range_result_iterator<const Container>::type >

The following code: <======================== template < class Container

void test_iter_range(Container& a_cont) { typedef typename range_result_iterator<Container>::type citer_type; typedef iterator_range<citer_type> riter_type; riter_type a_riter(a_cont.begin(),a_cont.end()); std::cout<<"a_riter.front="<<a_riter.front()<<"\n"; }

========================= Gives compile time error when Container is const. See test driver and compiler output in sandbox vault under cppljevans and in file iter_range_test.zip.

Is this an error in the range lib or am I doing something wrong? TIA. -regards, Larry