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#include <iostream>
#include <tuple>
#include <typeinfo>
 
struct Test
{
	virtual ~Test() = 0;
};
inline Test::~Test() = default;
 
template<typename T>
void f()
{
	std::cout << typeid(T).name() << std::endl;
}
 
int main()
{
	f<std::tuple<Test>>();
}
 

In file included from prog.cpp:2:0:
/usr/include/c++/5/tuple: In instantiation of 'struct std::_Head_base<0u, Test, false>':
/usr/include/c++/5/tuple:339:12:   required from 'struct std::_Tuple_impl<0u, Test>'
/usr/include/c++/5/tuple:463:11:   required from 'class std::tuple<Test>'
prog.cpp:14:29:   required from 'void f() [with T = std::tuple<Test>]'
prog.cpp:19:22:   required from here
/usr/include/c++/5/tuple:147:13: error: cannot declare field 'std::_Head_base<0u, Test, false>::_M_head_impl' to be of abstract type 'Test'
       _Head _M_head_impl;
             ^
prog.cpp:5:8: note:   because the following virtual functions are pure within 'Test':
 struct Test
        ^
prog.cpp:5:8: note: 	virtual Test::~Test()

Standard output is empty