C++11: buggy lambda behavior

Consider this C++11 code snippet:

#include <iostream>
#include <set>
#include <stdexcept>
#include <initializer_list>


int main(int argc, char ** argv)
{
    enum Switch {
        Switch_1,
        Switch_2,
        Switch_3,
        Switch_XXXX,
    };

    int foo_1 = 1;
    int foo_2 = 2;
    int foo_3 = 3;
    int foo_4 = 4;
    int foo_5 = 5;
    int foo_6 = 6;
    int foo_7 = 7;

    auto get_foos = [=] (Switch ss) -> std::initializer_list<int> {
        switch (ss) {
            case Switch_1:
                return {foo_1, foo_2, foo_3};
            case Switch_2:
                return {foo_4, foo_5};
            case Switch_3:
                return {foo_6, foo_7};
            default:
                throw std::logic_error("invalid switch");
        }
    };

    std::set<int> foos = get_foos(Switch_1);
    for (auto && foo : foos) {
        std::cout << foo << " ";
    }
    std::cout << std::endl;
    return 0;
}

Whatever compiler I try to test it seems all handle it incorrectly. So this makes me think that I am doing something wrong rather than it's a common bug across compilers.

clang 3.5 output:

-1078533848 -1078533752 134518134

gcc 4.8.2 output:

-1078845996 -1078845984 3

gcc 4.8.3 output (compiled on http://ift.tt/PopmyC):

1 2 267998238

gcc (unknown version) outoput (compiled on http://ift.tt/1c5pPp7)

-1785083736 0 6297428 

The problem seems to be caused by using std::initializer_list<int> as a return value of lambda. When changing lambda definition to [=] (Switch ss) -> std::set<int> {...} returned values are correct.

Please, help me solve this mystery.