False positive used-before-assignment with try/else

[mattclay]

Bug description

The used-before-assignment check reports a false positive with try/else starting with pylint 2.13.0.

"""bug.py"""


def demo():
    """Demonstrate used-before-assignment regression in pylint 2.13.0 and later."""
    try:
        pass
    except ValueError:
        error = True
    else:
        return

    print(error)

Configuration

No response

Command used

pylint bug.py

Pylint output

************* Module bug
bug.py:13:10: E0601: Using variable 'error' before assignment (used-before-assignment)

Expected behavior

No errors reported, as was the case for 2.12.2.

Pylint version

pylint 2.14.0
astroid 2.11.5
Python 3.9.5 (default, Nov 23 2021, 15:27:38) 
[GCC 9.3.0]

OS / Environment

Ubuntu 22.04.4

Additional dependencies

No response

[jacobtylerwalls]

Thanks for the well-written report. I have a diff for this that if all goes well we should be able to backport to 2.14.1.

[mattclay]

@jacobtylerwalls Thanks for responding so quickly. I've opened a related issue (#6804) which involves continue instead of return, in case you want to treat them as separate issues.