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#include <iostream>
using namespace std;
 
template<const char* s = "hello">
class A {
public:
	void foo();
};
 
template<const char* s>
void A<s>::foo() {
	cout << s;
}
 
typedef A<" world"> B;
 
class C : public A<"!\n"> {};
 
int main() {
	A<"hello"> a;
	B b;
	C c;
	a.foo();
	b.foo();
	c.foo();
	return 0;
}

prog.cpp:15:19: error: ‘" world"’ is not a valid template argument for type ‘const char*’ because string literals can never be used in this context
 typedef A<" world"> B;
                   ^
prog.cpp:17:25: error: ‘"!\012"’ is not a valid template argument for type ‘const char*’ because string literals can never be used in this context
 class C : public A<"!\n"> {};
                         ^
prog.cpp: In function ‘int main()’:
prog.cpp:20:11: error: ‘"hello"’ is not a valid template argument for type ‘const char*’ because string literals can never be used in this context
  A<"hello"> a;
           ^
prog.cpp:23:4: error: request for member ‘foo’ in ‘a’, which is of non-class type ‘int’
  a.foo();
    ^~~
prog.cpp:24:4: error: request for member ‘foo’ in ‘b’, which is of non-class type ‘B {aka int}’
  b.foo();
    ^~~
prog.cpp:25:4: error: ‘class C’ has no member named ‘foo’
  c.foo();
    ^~~

Standard output is empty