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#include <string>
#include <array>
 
constexpr int foo(){
	std::string s = "FooBar";
	return s.find('B');
}
 
int main() {
	std::array<int, foo()> arr;
}

prog.cpp: In function 'constexpr int foo()':
prog.cpp:5:18: error: variable 's' of non-literal type 'std::string {aka std::basic_string<char>}' in 'constexpr' function
  std::string s = "FooBar";
                  ^
In file included from /usr/include/c++/5/string:52:0,
                 from prog.cpp:1:
/usr/include/c++/5/bits/basic_string.h:2508:11: note: 'std::basic_string<char>' is not literal because:
     class basic_string
           ^
/usr/include/c++/5/bits/basic_string.h:2508:11: note:   'std::basic_string<char>' has a non-trivial destructor
prog.cpp: In function 'int main()':
prog.cpp:10:21: error: 'constexpr int foo()' called in a constant expression
  std::array<int, foo()> arr;
                     ^
prog.cpp:10:23: note: in template argument for type 'unsigned int' 
  std::array<int, foo()> arr;
                       ^

Standard output is empty