Template declaration problem?

["Bruce Eckel" <Eckel at CrestedButte dot net>]

This compiles and runs with KCC, but has some interesting problems compiling
with egcs 1.1:

//: C20:Ring.cpp
// Making a "ring" data structure from the STL
#include <iostream>
#include <list>
#include <string>
using namespace std;

template<class T>
class Ring {
  list<T> r;
  friend class iterator;
public:
  class iterator : public list<T>::iterator {
    list<T> r;
  public:
    iterator(const list<T>& lst, const list<T>::iterator& i)
      : r(lst), list<T>::iterator(i) {}
    bool operator==(const iterator& x) const

      return node == x.node;
    }
    bool operator!=(const iterator& x) const

      return !(*this == x);
    }
    list<T>::reference operator*() const

      return (*node).data;
    }
    iterator& operator++() {
      if(*this == iterator(r, r.end()))
        *this = iterator(r, r.begin());
      else
        node = (list<T>::link_type)((*node).next);
      return *this;
    }
    iterator operator++(int) {
        iterator tmp = *this;
        ++*this;
        return tmp;
    }
    iterator& operator--() {
      if(*this == iterator(r, r.begin()))
        *this = iterator(r, r.end());
      node = (list<T>::link_type)((*node).prev);
      return *this;
    }
    iterator operator--(int) {
        iterator tmp = *this;
        --*this;
        return tmp;
    }
  };
  void push_back(const T& x) {
    r.push_back(x);
  }
  iterator begin()

    return iterator(r, r.begin());
  }
  iterator end()

    return iterator(r, r.end());
  }
  iterator insert (iterator position,const T& x){
    return iterator(r.insert(position, x));
  }
  iterator erase (iterator position) {
    return iterator(r.erase(position));
  }
};

int main() {
  Ring<string> rs;
  rs.push_back("one");
  rs.push_back("two");
  rs.push_back("three");
  rs.push_back("four");
  rs.push_back("five");
  copy(rs.begin(), rs.end(), ostream_iterator<string>(cout, ", "));
} ///:~

================================
Bruce Eckel     http://www.BruceEckel.com
Contains free electronic books: "Thinking in Java" and "Thinking in C++ 2e"