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#include <memory>
#include <vector>
 
template <typename T>
struct holder
{
    holder() = default;
 
    holder(const holder& b)
        : t(b.t)
    {
    }
 
    holder(holder&& b) = delete;
 
    holder& operator=(const holder& b)
    {
        t = b.t;
        return *this;
    }
 
    holder& operator=(holder&& b) = delete;
 
    T t;
};
 
typedef holder<std::unique_ptr<int>> ptr;
 
typedef std::vector<ptr> vec;
 
typedef vec test_t;
 
test_t foo();
 
int main()
{
    test_t x = foo();
    x = foo();
    return 0;
}
 

/home/Yyouzx/ccjJRAta.o: In function `main':
prog.cpp:(.text.startup+0x1b): undefined reference to `foo()'
prog.cpp:(.text.startup+0x21): undefined reference to `foo()'
collect2: error: ld returned 1 exit status

Standard output is empty