re-raising an exception causes E0702

[smoser]

Steps to reproduce

1. myshow

    $ cat > myshow.py <<EOF
    #!/usr/bin/python3
    """foo"""
    try:
        int("9a")
    except ValueError as exc:
        print("apparently 9a is not an integer: %s" % exc)
        print("Exc is a: %r" % exc)
        raise exc
    EOF
   

2. run pylint

    $ python -m pylint \
       '--msg-template={path}:{line}: [{msg_id}({symbol}), {obj}] {msg}' \
        --output-format=text --rcfile=/dev/null myshow.py
    ************* Module myshow
    myshow.py:7: [E0702(raising-bad-type), ] Raising ValueError while only classes or instances are allowed
   

Current behavior

Complain that the raised value is a bad type.

Expected behavior

exc in the above is an instance of ValueError. What is wrong with raising it ?

pylint --version output

__main__.py 1.7.0, 
astroid 1.5.1
Python 3.5.2 (default, Nov 17 2016, 17:05:23) 
[GCC 5.4.0 20160609]