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#include <string>
 
int main() {   
    using namespace std::string_literals;
    {
        std::string s1    =  "Hello World!"s;
        std::u16string s2 = u"Hello World!"s;
        std::u32string s3 = U"Hello World!"s;
        std::wstring s4   = L"Hello World!"s;
    }
    {
        std::string s1    =  "Hello World!"s;
        std::u16string s2 =  "Hello World!"s;
        std::u32string s3 =  "Hello World!"s;
        std::wstring s4   =  "Hello World!"s;
    }
    return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:13:30: error: conversion from 'std::basic_string<char>' to non-scalar type 'std::u16string {aka std::basic_string<char16_t>}' requested
         std::u16string s2 =  "Hello World!"s;
                              ^
prog.cpp:14:30: error: conversion from 'std::basic_string<char>' to non-scalar type 'std::u32string {aka std::basic_string<char32_t>}' requested
         std::u32string s3 =  "Hello World!"s;
                              ^
prog.cpp:15:30: error: conversion from 'std::basic_string<char>' to non-scalar type 'std::wstring {aka std::basic_string<wchar_t>}' requested
         std::wstring s4   =  "Hello World!"s;
                              ^

Standard output is empty