Missing comma in list values lint

[VFLashM]

Steps to reproduce

DATA = [
    'a',
    'b' # missing comma
    'c',
    'd',
]

Current behavior

No warning

Expected behavior

It should probably be reported.
String values get silently concatenated because of missing comma. This is most certainly not what user wanted or expected.

pylint --version output

pylint 1.7.2,
astroid 1.5.3
Python 2.7.12 (default, Sep 20 2016, 14:05:04)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)]

[PCManticore]

The problem with this check is that it can result in a lot of false positives. How should you figure out that the string concatenation is not implicitly required? We also use this pattern a lot in our codebase for example and this check will emit on those instances as if they are problematic, which in fact is not.

[VFLashM]

Do you have such implicit string concatenation in list values or just somewhere in code?
I'm talking specifically about lists.

I can argue that it would be not a false positive, but a code smell.
For example, single character variables are not problematic on their own, but they are linted nonetheless.

[PCManticore]

In tuples. But the principle remains. Why should we warn about lists and not about tuples?

[VFLashM]

Yes, it stands for tuples too. I meant that stray values are more or less safe.