Parser does not handle correctly some errors when parsin from stdin

[pablogsal]

BPO	43410
Nosy	@pmp-p, @lysnikolaou, @pablogsal
PRs	bpo-43410: Fix crash in the parser when producing syntax errors when reading from stdin #24763

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-03-14.03:39:08.649>
created_at = <Date 2021-03-05.17:22:35.377>
labels = ['interpreter-core', '3.10']
title = 'Parser does not handle correctly some errors when parsin from stdin'
updated_at = <Date 2021-03-14.03:39:08.648>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2021-03-14.03:39:08.648>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2021-03-14.03:39:08.649>
closer = 'pablogsal'
components = ['Interpreter Core']
creation = <Date 2021-03-05.17:22:35.377>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 43410
keywords = ['patch']
message_count = 4.0
messages = ['388157', '388159', '388172', '388654']
nosy_count = 3.0
nosy_names = ['pmpp', 'lys.nikolaou', 'pablogsal']
pr_nums = ['24763']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue43410'
versions = ['Python 3.10']

[pablogsal]

The parser crashes when there are some syntax errors from stdin:

echo "(1+34" | ./python.exe -
[1] 54046 done echo "(1+34" |
54047 segmentation fault ./python.exe -

[pablogsal]

I think we should look into having some variable holding all the text that we have parsed so far. All the workarounds to fetch the text from the file or from stdin or whatnot are getting very very complicated.

[pablogsal]

I modified PR 24763 to implement this idea.

[pablogsal]

New changeset cd8dcbc by Pablo Galindo in branch 'master':
bpo-43410: Fix crash in the parser when producing syntax errors when reading from stdin (GH-24763)
cd8dcbc