False positive used-before-assignment on different line returns

[otchita]

This is related to my previous issue #4238 for the support of the walrus operator. Another edge case seems to be unhandled. That of different line returns.

Steps to reproduce

Given a file good-test.py:

"""Good test example."""
def func():
    """Test."""
    return f'The number {(count := 4)} is equal to {count}'

pylint doesn't detect any errors which is expected. However when return to a line like this:

Given a file bad-test.py:

"""Bad test example."""
def func():
    """Test."""
    return f'The number {(count := 4)} ' \
           f'is equal to {count}'

We obtain the following:

Current behavior

Result of pylint bad-test.py:

************* Module test
bad-test.py:4:19: E0601: Using variable 'count' before assignment (used-before-assignment)

Expected behavior

Normally, this should not raise any errors.

pylint --version output

Result of pylint --version output on my local macOS:

pylint 2.7.4
astroid 2.5.2
Python 3.8.8 (v3.8.8:024d8058b0, Feb 19 2021, 08:48:17) 
[Clang 6.0 (clang-600.0.57)]

[cdce8p]

Thanks for the report! The issue will be fixed with #4307