Incorrect line number for syntax error.

[markshannon]

BPO	44056
Nosy	@markshannon, @lysnikolaou, @pablogsal
PRs	[3.10] bpo-44056: Fix syntax error lineno in try-except #25939

^{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 = 'https://github.com/markshannon'
closed_at = <Date 2021-05-07.13:58:20.013>
created_at = <Date 2021-05-06.11:31:28.231>
labels = ['interpreter-core', 'type-bug', '3.10', 'release-blocker']
title = 'Incorrect line number for syntax error.'
updated_at = <Date 2021-05-07.13:58:20.013>
user = 'https://github.com/markshannon'

bugs.python.org fields:

activity = <Date 2021-05-07.13:58:20.013>
actor = 'Mark.Shannon'
assignee = 'Mark.Shannon'
closed = True
closed_date = <Date 2021-05-07.13:58:20.013>
closer = 'Mark.Shannon'
components = ['Parser']
creation = <Date 2021-05-06.11:31:28.231>
creator = 'Mark.Shannon'
dependencies = []
files = []
hgrepos = []
issue_num = 44056
keywords = ['patch']
message_count = 1.0
messages = ['393083']
nosy_count = 3.0
nosy_names = ['Mark.Shannon', 'lys.nikolaou', 'pablogsal']
pr_nums = ['25939']
priority = 'release blocker'
resolution = 'fixed'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue44056'
versions = ['Python 3.10']

[markshannon]

Consider this function, which has a syntax error on line 4.

>>> def f():
...     try: 
...         1/0
...     except:
...         pass
...     except Exception: 
...         pass

3.9 reports an incorrect line number of 3.
3.10b reports an even more incorrect line number of -1.

Although I've marked this as a "Parser" bug, the offending code is in the compiler.

For 3.11, this is fixed by #25729