libstdc++-v3/testsuite/20_util/pair/requirements/structural.cc - gcc - Git at Google

 // { dg-do compile { target c++20 } }

 #include <utility>

 // C++20 20.4.2 [pairs.pair]
 // pair<T, U> is a structural type (13.2) if T and U are both structural types.

 template<std::pair<int, int>> struct S; // PR libstdc++/97930
	// { dg-do compile { target c++20 } }

	#include <utility>

	// C++20 20.4.2 [pairs.pair]
	// pair<T, U> is a structural type (13.2) if T and U are both structural types.

	template<std::pair<int, int>> struct S; // PR libstdc++/97930