/in/foo.cc:20:15: error: invalid preprocessing directive #print
             # print("Debug:", p, l)
               ^~~~~
/in/foo.cc:2:10: error: expected class-name before '=' token
     tree = dict()
          ^
/in/foo.cc:2:10: error: expected '{' before '=' token
/in/foo.cc:2:10: error: expected unqualified-id before '=' token