/in/foo.cc: In function 'void test02(Complex, Complex, Complex)':
/in/foo.cc:83:19: error: expected ')' before 'c'
       if (c[i+1]  c[i])
                   ^
/in/foo.cc:83:16: error: could not convert 'c[(i + 1)]' from 'Complex' to 'bool'
       if (c[i+1]  c[i])
           ~~~~~^