/in/foo.cc:2:1: error: 'def' does not name a type
 def main():
 ^~~
/in/foo.cc:23:17: error: 'k' does not name a type
                 k+=1; l-=1;
                 ^
/in/foo.cc:23:23: error: 'l' does not name a type
                 k+=1; l-=1;
                       ^
/in/foo.cc:24:9: error: 't' does not name a type
         t+=1
         ^