Try parsing the following Python code: `x = 1 print(x := 3)` You will get a tree full of error nodes. NoViableAltException appears to be thrown but caught and passed back. That code is valid, though. I ran that in Python 3.13.0 as screenshotted here to demonstrate the code is valid: <img width="258" height="146" alt="Image" src="https://github.com/user-attachments/assets/df64b64d-d9a7-4bc3-b85c-2f28addca808" />