python 00*.py
 @ file_input ...
   @ funcdef ...
     @ NAME Leaf(1, 'def')
     @ NAME Leaf(1, 'f')
     @ parameters ...
       @ LPAR ...
       @ tname ...
         @ NAME Leaf(1, 'x')
         @ COLON ...
         @ NAME Leaf(1, 'int')
       @ RPAR ...
     @ RARROW ...
     @ NAME Leaf(1, 'int')
     @ COLON ...
     @ suite ...
       @ NEWLINE ...
       @ INDENT ...
       @ if_stmt ...
         @ NAME Leaf(1, 'if')
         @ comparison ...
           @ NAME Leaf(1, 'x')
           @ EQEQUAL ...
           @ NUMBER ...
         @ COLON ...
         @ suite ...
           @ NEWLINE ...
           @ INDENT ...
           @ simple_stmt ...
             @ return_stmt ...
               @ NAME Leaf(1, 'return')
               @ NUMBER ...
             @ NEWLINE ...
           @ DEDENT ...
         @ NAME Leaf(1, 'else')
         @ COLON ...
         @ suite ...
           @ NEWLINE ...
           @ INDENT ...
           @ simple_stmt ...
             @ return_stmt ...
               @ NAME Leaf(1, 'return')
               @ term ...
                 @ NAME Leaf(1, 'x')
                 @ STAR ...
                 @ power ...
                   @ NAME Leaf(1, 'f')
                   @ trailer ...
                     @ LPAR ...
                     @ arith_expr ...
                       @ NAME Leaf(1, 'x')
                       @ MINUS ...
                       @ NUMBER ...
                     @ RPAR ...
             @ NEWLINE ...
           @ DEDENT ...
       @ DEDENT ...
   @ ENDMARKER ...