/in/foo.cc: In member function 'bool Cmp::operator()(const Work&, const Work&)':
/in/foo.cc:28:21: error: 'const class Work' has no member named 'u'
         return left.u < right.u;
                     ^
/in/foo.cc:28:31: error: 'const class Work' has no member named 'u'
         return left.u < right.u;
                               ^