Description

assignee = None
closed_at = <Date 2020-10-31.19:06:57.352>
created_at = <Date 2020-10-31.11:16:42.448>
labels = ['interpreter-core', '3.9']
title = 'SystemError in compile builtin function'
updated_at = <Date 2020-11-01.04:14:56.509>
user = 'https://github.com/Zac-HD'

activity = <Date 2020-11-01.04:14:56.509>
actor = 'Zac Hatfield-Dodds'
assignee = 'none'
closed = True
closed_date = <Date 2020-10-31.19:06:57.352>
closer = 'lys.nikolaou'
components = ['Interpreter Core']
creation = <Date 2020-10-31.11:16:42.448>
creator = 'Zac Hatfield-Dodds'
dependencies = []
files = []
hgrepos = []
issue_num = 42218
keywords = ['patch']
message_count = 5.0
messages = ['380053', '380063', '380088', '380090', '380113']
nosy_count = 5.0
nosy_names = ['serhiy.storchaka', 'lys.nikolaou', 'Zac Hatfield-Dodds', 'miss-islington', 'BTaskaya']
pr_nums = ['23058', '23065', '23066']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42218'
versions = ['Python 3.9']

Activity

1. Zac-HD commented on Oct 31, 2020

   

   Zac-HDmannequin

   on Oct 31, 2020

   MannequinAuthor

   More actions

   In Python 3.9.0, running

       compile('A.\u018a\\ ', '<string>', 'single')

   raises

   SystemError: <built-in function normalize> returned a result with an error set
   

   This is obviously invalid syntax, but it would still be nice to raise SyntaxError for that and the SystemError may be symptomatic of a bug. Unfortunately I have no insight to offer beyond this hand-minimised reproducer :-/
2. Zac-HD

   added

   3.9 (EOL)end of lifeend of life

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   on Oct 31, 2020
3. serhiy-storchaka commented on Oct 31, 2020

   

   serhiy-storchaka

   on Oct 31, 2020

   Member

   More actions

   Nice catch Zac!
4. lysnikolaou commented on Oct 31, 2020

   

   lysnikolaou

   on Oct 31, 2020

   Member

   More actions

   New changeset 02cdfc9 by Lysandros Nikolaou in branch 'master':
   bpo-42218: Correctly handle errors in left-recursive rules (GH-23065)
   02cdfc9
5. miss-islington commented on Oct 31, 2020

   

   miss-islington

   on Oct 31, 2020

   Contributor

   More actions

   New changeset cfcb952 by Lysandros Nikolaou in branch '3.9':
   [3.9] bpo-42218: Correctly handle errors in left-recursive rules (GH-23065) (GH-23066)
   cfcb952
6. lysnikolaou

   closed this as completedon Oct 31, 2020
7. lysnikolaou

   closed this as completedon Oct 31, 2020
8. Zac-HD commented on Nov 1, 2020

   

   Zac-HDmannequin

   on Nov 1, 2020

   MannequinAuthor

   More actions

   Wow! Thanks and congrats on the super-fast fix :-)

   FYI Paul Ganssle has recently [1] started to work on adding property-based tests to CPython CI [2]. Once Paul gets the stubs and first set of tests working, I'll start moving the others over from my demo repo [3] to CPython master so we catch this kind of bug earlier in future.

   [1] https://bugs.python.org/issue42109; see also https://bugs.python.org/issue38953
   [2] https://pyfound.blogspot.com/2020/05/property-based-testing-for-python.html
   [3] https://github.com/Zac-HD/stdlib-property-tests
9. ezio-melotti

   transferred this issue fromon Apr 10, 2022

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