gcc/testsuite/g++.dg/cpp1z/class-deduction1.C - gcc - Git at Google

 // { dg-do compile { target c++17 } }

 template <class T>
 struct A
 {
   A(T);
 };

 A a (42);
	// { dg-do compile { target c++17 } }

	template <class T>
	struct A
	{
	A(T);
	};

	A a (42);