[New-bugs-announce] [issue33308] parser.st2list(..., col_info=True) triggers a SystemError

[Brett Cannon]

New submission from Brett Cannon <brett at python.org>:

`parser.st2list(parser.suite(""), col_info=True)` causes:

Fatal Python error: a function returned a result with an error set
IndexError: list assignment index out of range

```
The above exception was the direct cause of the following exception:

SystemError: <built-in function st2list> returned a result with an error set

Current thread 0x00007fff9ca99380 (most recent call first):
  File "/private/tmp/tester/lazy/sub.py", line 3 in <module>
fish: '/Users/brettcannon/Repositories…' terminated by signal SIGABRT (Abort)
```

----------
components: Library (Lib)
messages: 315455
nosy: brett.cannon
priority: normal
severity: normal
stage: test needed
status: open
title: parser.st2list(..., col_info=True) triggers a SystemError
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33308>
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