/in/foo.cc: In function 'bool operator<(line, line)':
/in/foo.cc:14:4: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
/in/foo.cc: In function 'bool operator>(line, line)':
/in/foo.cc:19:4: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^