Parenthesized "this" and final fields

[Tagir Valeev]

Hello!

I've found this issue:
https://bugs.openjdk.java.net/browse/JDK-8156180

In Java 8 "(this)" expression was not specially handled as qualifier with
respect to DA/DU analysis. This issue says to fix the problem. However to
me it seems that the problem was fixed only partially. E.g. the following
code still compiles in Java 10:

class Unassigned {
  final int x = (this).y + 1;
  final int y = (this).x + 1;
}

While removing parentheses make it failing of course. Also the following
code fails:

class Unassigned {
  final int x;

  Unassigned() {
    (this).x = 1;
  }
}

While removing parentheses make it working. I expect that either
parentheses should be allowed everywhere or disallowed everywhere. It was
consistent in Java 8 (disallowed everywhere), and now it looks confusing.

What do you think? Does this behavior follow the spec?

With best regards,
Tagir Valeev.
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