# [Python 3], 53 bytes

<!-- language-all: lang-python -->

    I=input
    X=vars(vars()[I()])
    X[I()]=X[I()]
    class I:1/0

[Try it online!][TIO-kp2g3z9p]

[Python 3]: https://docs.python.org/3/
[TIO-kp2g3z9p]: https://tio.run/##K6gsycjPM/7/39M2M6@gtIQrwrYssahYA0xoRntqaMZqckWAaVsIxZWck1hcrOBpZahv8P8/AA "Python 3 – Try It Online"

Takes 3 lines of input on STDIN. Output is, printed to STDERR, the following text:

```
Traceback (most recent call last):
  File ".code.tio", line 4, in <module>
    class I:1/0
IndexError: tuple index out of range
```

(replace `.code.tio` with whatever the filename of the program is)

I will offer a +50 rep bounty to the first valid Robbers' answer within the  two week period.