:= operator is valid in Python 3.13.0 but fails parsing with DT Python Parser

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
48/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
javascript, python
Domain
compilers

Research direction

Start by reproducing the reported x := 3 example through the parser entry point and inspect how assignment expressions are handled. The issue names no files or tests; done means valid Python 3.13 syntax produces a parse tree without error nodes or an uncaught NoViableAltException.

Written by the indexing model from the issue text.

Description

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:
Image

Dominant language
JavaScript
Stars
25
Forks
7
No merged PRs in 30d

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  4. Open a pull request that references the issue number.

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