>>> x++                                                                                                                                                                                                                                        
        | [ *<closure <def <module>>> ]
0000    1 OP_GET_GLOBAL       0 '"x"' (type=String)
        | [ *<closure <def <module>>> ][ 1 ]
0002    | OP_CONSTANT         1 '1' (type=Integer)
        | [ *<closure <def <module>>> ][ 1 ][ 1 ]
0004    | OP_ADD
        | [ *<closure <def <module>>> ][ 2 ]
0005    | OP_SET_GLOBAL       0 '"x"' (type=String)
        | [ *<closure <def <module>>> ][ 2 ]
0007    | OP_POP
        | [ *<closure <def <module>>> ]