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#include <cstdio>
 
template<int,typename> struct dummy;
 
int main()
{
	const char ex1[] = "test";
	const char ex2[] = {'t', 'e', 's', 't', '\0'};
	auto ex3 = "test";
	auto &ex4 = "test";
	auto && ex5 = "test";
 
	dummy<1,decltype(ex1)>{};
	dummy<2,decltype(ex2)>{};
	dummy<3,decltype(ex3)>{};
	dummy<4,decltype(ex4)>{};
	dummy<5,decltype(ex5)>{};
}

prog.cpp: In function ‘int main()’:
prog.cpp:13:25: error: invalid use of incomplete type ‘struct dummy<1, const char [5]>’
  dummy<1,decltype(ex1)>{};
                         ^
prog.cpp:3:31: note: declaration of ‘struct dummy<1, const char [5]>’
 template<int,typename> struct dummy;
                               ^~~~~
prog.cpp:14:25: error: invalid use of incomplete type ‘struct dummy<2, const char [5]>’
  dummy<2,decltype(ex2)>{};
                         ^
prog.cpp:3:31: note: declaration of ‘struct dummy<2, const char [5]>’
 template<int,typename> struct dummy;
                               ^~~~~
prog.cpp:15:25: error: invalid use of incomplete type ‘struct dummy<3, const char*>’
  dummy<3,decltype(ex3)>{};
                         ^
prog.cpp:3:31: note: declaration of ‘struct dummy<3, const char*>’
 template<int,typename> struct dummy;
                               ^~~~~
prog.cpp:16:25: error: invalid use of incomplete type ‘struct dummy<4, const char (&)[5]>’
  dummy<4,decltype(ex4)>{};
                         ^
prog.cpp:3:31: note: declaration of ‘struct dummy<4, const char (&)[5]>’
 template<int,typename> struct dummy;
                               ^~~~~
prog.cpp:17:25: error: invalid use of incomplete type ‘struct dummy<5, const char (&)[5]>’
  dummy<5,decltype(ex5)>{};
                         ^
prog.cpp:3:31: note: declaration of ‘struct dummy<5, const char (&)[5]>’
 template<int,typename> struct dummy;
                               ^~~~~

Standard output is empty