no-member when using a context manager

[HenkeA]

I have the following code snippet:

class A:
    def __enter__(self):
        return self
    def __exit__(self, err_type, err, traceback):
        return
class B(A):
    def foo(self):
        pass
with B() as b:
    b.foo()

When running pylint on this, I get
no_member.py:10:4: E1101: Instance of '_Aa' has no 'b_method' member (no-member)

If I add a __enter__ and __exit__ to B, I get no error.
I only get this error depending on pylint version combined with astroid version
I have tried it with both Python 3.6 and 3.7
pylint 2.4.x - Always fails
pylint 2.3.x - Fails with newer astroid
pylint 2.3.x - Passes with astroid==2.2.5

I have seen some similar issues, but not found anyone really like this.

Steps to reproduce

1. Use python 3.6 or 3.7
2. Install latest pylint
3. Run pylint on code above

Current behavior

no_member.py:10:4: E1101: Instance of '_Aa' has no 'b_method' member (no-member)

Expected behavior

Not that error

pylint --version output

pylint 2.4.2
astroid 2.3.1
Python 3.7.3 (default, Jun 19 2019, 21:29:22)

[sam-s]

I still observe this with

pylint 2.4.4
astroid 2.3.3
Python 3.7.6 (default, Dec 30 2019, 19:38:28) 
[Clang 11.0.0 (clang-1100.0.33.16)]

[sam-s]

should I create a new issue or will you reopen this one?

[PCManticore]

@sam-s The fix has not been released yet, it will be part of 2.5 when we'll do the release.