Strange error with list iterator

[Giuseppe Martino <rdmartin at infinito dot it>]

Compiling this sources:

#include <list>
#include <string>
#include <iostream>

using namespace std;

int main()
{
    list<string> l;
    l.push_back("ciao"); 
    typedef std::list <string>::iterator it;
    for(it i=l.begin(); i<l.end(); i++)
	cout<<*i;
}

i have tried to compile it with gcc-3.0.0 and gcc-3.0.2 but it's the same
Compiling with the command:
g++ -ansi -pedantic -Wall -c show.cpp

show.cpp: In function `int main()':
show.cpp:12: no match for `int main()::it& < std::_List_iterator<std::string, 
   std::string&, std::string*>' operator
make: *** [show.o] Error 1
it's seem that l.begin() return a reference. what is the problem?
thank you