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#include <iostream>
using namespace std;
 
struct mystring {
    mystring(const char* str) {
        cout << "Constructed '" << str << "'" << endl;
    }
    __attribute__((warn_unused_result))
    bool operator==(const mystring& other) const {
        cout << "Compared" << endl;
        return false;
    }
};
 
int main() {
	mystring a("hello");
	a == "world";
	return 0
}

prog.cpp: In function ‘int main()’:
prog.cpp:19:1: error: expected ‘;’ before ‘}’ token
 }
 ^
prog.cpp:17:14: warning: ignoring return value of ‘bool mystring::operator==(const mystring&) const’, declared with attribute warn_unused_result [-Wunused-result]
  a == "world";
              ^

Standard output is empty