/in/foo.cc: In function 'int min(Node*)':
/in/foo.cc:29:8: warning: statement has no effect [-Wunused-value]
  for (p; p != NULL; p = p->next)
        ^
/in/foo.cc:35:8: warning: statement has no effect [-Wunused-value]
  for (p; p != NULL; p = p->next)
        ^