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class Test
{
	public:
		template<typename T, typename U = T> 
		operator U() 
		{
			return U();
		}
};
class Test1{};
 
int main() {
	Test t;
	Test1 t1 = (Test1)t;
 
	return 0;
}
 

prog.cpp: In function 'int main()':
prog.cpp:15:20: error: no matching function for call to 'Test1::Test1(Test&)'
  Test1 t1 = (Test1)t;
                    ^
prog.cpp:11:7: note: candidate: constexpr Test1::Test1()
 class Test1{};
       ^
prog.cpp:11:7: note:   candidate expects 0 arguments, 1 provided
prog.cpp:11:7: note: candidate: constexpr Test1::Test1(const Test1&)
prog.cpp:11:7: note:   no known conversion for argument 1 from 'Test' to 'const Test1&'
prog.cpp:11:7: note: candidate: constexpr Test1::Test1(Test1&&)
prog.cpp:11:7: note:   no known conversion for argument 1 from 'Test' to 'Test1&&'

Standard output is empty