Pylint wrongly detects alias properties in slotted classes

[mathieui]

Hi, we encountered the issue in our CI which runs a pylint -E.
The issue does not happen in non-slotted classes, as far as I am aware.

Steps to reproduce

Run pylint -E on the following file:

class TestClass:
    __slots__ = ['_i']
    def __init__(self):
        self._i = 0

    @property
    def i(self):
        return self._i

    @i.setter
    def i(self, v):
        self._i = v

    other = i

instance = TestClass()
instance.other = 42
print(instance.i)

Current behavior

************* Module test
test.py:17:0: E0237: Assigning to attribute 'other' not defined in class slots (assigning-non-slot)

(and other errors in the code using that class)

Expected behavior

No error

pylint --version output

pylint 2.1.1
astroid 2.0.4
Python 3.7.0 (default, Jul 15 2018, 10:44:58) 
[GCC 8.1.1 20180531]

[PCManticore]

Thanks for reporting this issue! I can confirm the bug, pylint in this case is not taking in account the class level other attribute.