Trivial Python bytecode hack

>>> c = compile("1", "", "eval")
>>> dis.dis(c)
  1           0 LOAD_CONST               0 (1)
              3 RETURN_VALUE
>>> eval(c)
1
>>> c2 = type(c)(c.co_argcount, c.co_kwonlyargcount, c.co_nlocals, c.co_stacksize, c.co_flags, c.co_code[:3], c.co_consts, c.co_names, c.co_varnames, c.co_filename, c.co_name, c.co_firstlineno, c.co_lnotab)
>>> dis.dis(c2)
  1           0 LOAD_CONST               0 (1)
>>> eval(c2)
XXX lineno: 1, opcode: 100
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "", line 1, in <module>
SystemError: unknown opcode