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Invalid error messages after GH-134077 #135422

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Invalid error messages after GH-134077#135422
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sobolevn
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3.15bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)topic-parsertype-bugAn unexpected behavior, bug, or error

Description

@sobolevn
sobolevn
opened on Jun 12, 2025

Bug report

In #134036 (PR: #134077) I broke this use-case:

# ex.py
raise AssertionError() from None

print(1,,2)

Running ./python.exe ex.py on it produces:

» ./python.exe ex.py
  File "/Users/sobolev/Desktop/cpython/ex.py", line 1
    raise AssertionError() from None
                           ^^^^
SyntaxError: did you forget an expression after 'from'?

Which is not correct. I am fixing it right now, sorry! :(

CC @pablogsal @lysnikolaou

Linked PRs

Activity

  1. sobolevn
    self-assigned this
    on Jun 12, 2025
  2. sobolevn
    added
    type-bugAn unexpected behavior, bug, or error
    interpreter-core(Objects, Python, Grammar, and Parser dirs)
    release-blocker
    topic-parser
    on Jun 12, 2025
  3. ezio-melotti
    added this to Release and Deferred blockers 🚫on Jun 12, 2025
  4. github-project-automation
    moved this to Todo in Release and Deferred blockers 🚫on Jun 12, 2025
  5. sobolevn
    added a commit that references this issue on Jun 12, 2025

    pythongh-135422: Fix regression in `SyntaxError` messages after pytho…

    0d94e64
  6. sobolevn
    added
    3.15bugs and security fixes
    and removed
    release-blocker
    on Jun 12, 2025

  7. sobolevn commented on Jun 12, 2025

    @sobolevn
    sobolevn
    on Jun 12, 2025
    MemberAuthor

    This did not make it to 3.14, so I removed the release-blocker label. Only 3.15 is affected.

  8. picnixz
    changed the title [-]Invalid error messages after #134036[/-] [+]Invalid error messages after GH-134036[/+] on Jun 14, 2025

  9. picnixz commented on Jun 14, 2025

    @picnixz
    picnixz
    on Jun 14, 2025 · Hidden as outdated
  10. picnixz
    changed the title [-]Invalid error messages after GH-134036[/-] [+]Invalid error messages after GH-134077[/+] on Jun 14, 2025
  11. picnixz
    removed this from Release and Deferred blockers 🚫on Jun 14, 2025
  12. sobolevn
    added a commit that references this issue on Jun 30, 2025

    gh-135422: Fix regression in `SyntaxError` messages after #134036 (#1…

    7e33558

  13. sobolevn commented on Jun 30, 2025

    @sobolevn
    sobolevn
    on Jun 30, 2025
    MemberAuthor

    Thanks everyone, done!

  14. sobolevn
    closed this as completedon Jun 30, 2025
  15. AndPuQing
    added a commit that references this issue on Jul 11, 2025

    pythongh-135422: Fix regression in `SyntaxError` messages after pytho…

    88c9480
  16. Pranjal095
    added a commit that references this issue on Jul 12, 2025

    pythongh-135422: Fix regression in `SyntaxError` messages after pytho…

    27a5841
  17. picnixz
    added a commit that references this issue on Jul 13, 2025

    pythongh-135422: Fix regression in `SyntaxError` messages after pytho…

    24a2572
  18. taegyunkim
    added a commit that references this issue on Aug 4, 2025

    pythongh-135422: Fix regression in `SyntaxError` messages after pytho…

    94599d6
  19. Agent-Hellboy
    added a commit that references this issue on Aug 19, 2025

    pythongh-135422: Fix regression in `SyntaxError` messages after pytho…

    2c13c88
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