compile() passes rest of file as SyntaxError().text when file unreadable

[gvanrossum]

BPO	40619
Nosy	@gvanrossum, @lysnikolaou, @pablogsal
PRs	bpo-40619: Correctly handle error lines in programs without file mode #20090

^{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 2020-05-14.20:12:11.638>
created_at = <Date 2020-05-14.03:57:30.165>
labels = ['type-bug', '3.9']
title = 'compile() passes rest of file as SyntaxError().text when file unreadable'
updated_at = <Date 2020-05-14.20:12:11.637>
user = 'https://github.com/gvanrossum'

bugs.python.org fields:

activity = <Date 2020-05-14.20:12:11.637>
actor = 'pablogsal'
assignee = 'none'
closed = True
closed_date = <Date 2020-05-14.20:12:11.638>
closer = 'pablogsal'
components = []
creation = <Date 2020-05-14.03:57:30.165>
creator = 'gvanrossum'
dependencies = []
files = []
hgrepos = []
issue_num = 40619
keywords = ['patch', '3.4regression']
message_count = 2.0
messages = ['368815', '368865']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'lys.nikolaou', 'pablogsal']
pr_nums = ['20090']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue40619'
versions = ['Python 3.9']

[gvanrossum]

Example:

>>> compile("pass\n(1+)\npass", "<string>", "exec")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "", line 2
    (1+)
pass
       ^
SyntaxError: invalid syntax
>>> 

Note that the input is

pass
(1+)
pass

The second "pass" (and in fact the entire file) leaks into the SyntaxError object's text attribute.

This only happens when the file (here "<string>") cannot be read.

It's not specific to compile(), it seems fundamental in the C-level pegen API.

[pablogsal]

New changeset bcc3036 by Pablo Galindo in branch 'master':
bpo-40619: Correctly handle error lines in programs without file mode (GH-20090)
bcc3036