-j0 hides duplicate-code

[The-Compiler]

When I have two files like this:

def fun1():
    pass

def fun2():
    pass

def fun3():
    pass

And I run pylint (1.5.0 or current master) without -j, I get duplicate-code as expected:

$ pylint 1.py 2.py -rn --disable=all --enable=duplicate-code    
No config file found, using default configuration
************* Module 2
R:  1, 0: Similar lines in 2 files
[...]

Adding -j0 hides the error:

$ pylint 1.py 2.py -rn --disable=all --enable=duplicate-code -j0
No config file found, using default configuration

-------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 9.17/10, +0.83)

I figured this out because I got the message on AppVeyor but not on Travis, so this might be a Linux-only issue?

[doublethefish]

Fixed by PR #3458, also see #3314 .

[Pierre-Sassoulas]

Closing because it was fixed in #4007 (pylint 2.6.1) based on #3458