C++17, string + string_view gives compilation error [duplicate]

As per the C++17 book from "Nicolai M. Josuttis" the following code should compile.

#include <string_view>#include <string>int main(){        std::string_view sv1 = "hello";        std::string_view sv2 = "world";        auto s = std::string(sv1) + sv2;}

I get the following error (edited for clarity)

    test.cpp: In function ‘int main()’:    test.cpp:7:28: error: no match for ‘operator+’ (operand types are ‘std::string’ and ‘std::string_view’)        7 |  auto s = std::string(sv1) + sv2;          |                ~~~~~~~~~~~ ^ ~~~          |                |             |          |                |             std::string_view {aka std::basic_string_view<char>}          |                std::string {aka std::basic_string<char>}    In file included from /usr/lib/gcc/x86_64-pc-cygwin/9.3.0/include/c++/bits/stl_algobase.h:67,                     from /usr/lib/gcc/x86_64-pc-cygwin/9.3.0/include/c++/bits/char_traits.h:39,                     from /usr/lib/gcc/x86_64-pc-cygwin/9.3.0/include/c++/string_view:42,                     from test.cpp:1: