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#include <iostream>
#include <string>
 
struct Foo {
    Foo (std::string x) { std::cout << x << std::endl; }
};
 
std::string x("hello, world");
 
int main () { Foo(x); }

prog.cpp: In function ‘int main()’:
prog.cpp:10:20: error: no matching function for call to ‘Foo::Foo()’
 int main () { Foo(x); }
                    ^
prog.cpp:10:20: note: candidates are:
prog.cpp:5:5: note: Foo::Foo(std::string)
     Foo (std::string x) { std::cout << x << std::endl; }
     ^
prog.cpp:5:5: note:   candidate expects 1 argument, 0 provided
prog.cpp:4:8: note: Foo::Foo(const Foo&)
 struct Foo {
        ^
prog.cpp:4:8: note:   candidate expects 1 argument, 0 provided

Standard output is empty