RFR: 8254105: allow static nested declarations [v4]

[Vicente Romero]

On Tue, 3 Nov 2020 17:18:36 GMT, Vicente Romero <vromero at openjdk.org> wrote:

>> The changes look good, but I have one concern: this patch seem to apply the improvements unconditionally, regardless of the source version - is this what we want? While I understand that the risk is low (this patch makes space of compilable programs bigger), at the same times it feels wrong that when compiling with `--source 14` I can now nest static classes inside member classes (which is not compatible with what the SE 14 spec says).
>
>> As @mcimadamore, I think this should only be allowed for -source 16+, right?
> 
> I agree, I'm working on another iteration to fix the issue, thanks for the comments

I have pushed a commit addressing the review comments so far. I have re-added code in Attr but this time behind a guard checking if records are allowed in the current source and I have added back some tests I removed before. The tests are now executed with current source and with source 15. Thanks for the comments so far.

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PR: https://git.openjdk.java.net/jdk/pull/571