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#include <iostream>
#include <string>
 
constexpr std::string appendStringC(std::string s)
{
    return s + " Constexpr func";
}
 
std::string appendString(std::string s)
{
    return s + " Regular func";
}
 
int main()
{
    std::string s1 = "String 1";
    std::string s2 = "String 2";
    std::cout << std::endl
              << appendStringC(s1) << std::endl
              << appendString(s2) << std::endl;
    return 0;
}

prog.cpp: In function 'constexpr std::string appendStringC(std::string)':
prog.cpp:4:23: error: invalid type for parameter 1 of constexpr function 'constexpr std::string appendStringC(std::string)'
 constexpr std::string appendStringC(std::string s)
                       ^
In file included from /usr/include/c++/5/string:52:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 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:4:23: error: invalid return type 'std::string {aka std::basic_string<char>}' of constexpr function 'constexpr std::string appendStringC(std::string)'
 constexpr std::string appendStringC(std::string s)
                       ^

Standard output is empty