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struct S
{
    S& operator =(const S& rhs) & // note the final &
                                  // to restrict this to be lvalue
    {
        // implementation
        return *this;
    }
};
 
S operator +(const S& lhs, const S& rhs);
 
int main()
{
    S a, b, c;
 
    (a + b) = c;
    return 0;
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:17:13: error: no match for ‘operator=’ (operand types are ‘S’ and ‘S’)
     (a + b) = c;
             ^
prog.cpp:17:13: note: candidate is:
prog.cpp:3:8: note: S& S::operator=(const S&) &
     S& operator =(const S& rhs) & // note the final &
        ^
prog.cpp:3:8: note:   no known conversion for implicit ‘this’ parameter from ‘S’ to ‘S&’

Standard output is empty