c – GCC在lambda中对我的静态变量做什么？

#include <string>
#include <vector>
#include <iterator>
#include <algorithm>
#include <iostream>

int main()
{
    static const std::string foo {"foo"};
    std::vector<std::string> bars {{""}};
    std::cout << "foo outside: " << foo << std::endl;
    std::for_each(std::cbegin(bars),std::cend(bars),[] (const auto& bar) {
        std::cout << "foo inside: " << foo << std::endl;
    });
}

打印：

foo outside: foo
foo inside:

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这是怎么回事？