Brackets that come under each other should not pass

[sobolevn]

Bug report

What's wrong

Currently we allow brackets that located like so:

xy = [[
]
]

How is that should be

This should raise a violation. Correct code samples:

xy = [[]]
xy = [
    [],
]
xy = [[
]]

[sobolevn]

It raises tests/fixtures/noqa.py:2:2: C812 missing trailing comma which is good enough.

And this example:

xy = [[
],
]

still should not be allowed.

[sobolevn]

This will be marked as a low priority. Since the algo to count parens like this is too complex. And the profit is not so big.

[sobolevn]

I cannot fight these corner cases:

x = [
    [1],   # note [ position
    [2],  # note [ position
]

This is a valid case. But, [ comes just under [ So, it is hard to tell the difference between these two cases.

[sobolevn]

To fix this we also need to count "level" of brackets. It is possible to nest brackets of the same level. But, not different levels.