View Compilation Error

0_0_4075013_19387.cpp: In function `std::ostream& operator<<(std::ostream&, const std::set<T, std::less<_Key>, std::allocator<_CharT> >&)':
0_0_4075013_19387.cpp:41: error: expected `;' before "itr"
0_0_4075013_19387.cpp:41: error: `itr' undeclared (first use this function)
0_0_4075013_19387.cpp:41: error: (Each undeclared identifier is reported only once for each function it appears in.)