[records] Is C-style array declaration in components dropped?

Tagir Valeev amaembo at gmail.com
Fri Jul 24 04:06:14 UTC 2020

Btw if this change is intended, then it looks like the changes in
section 10.2 [1] must be dropped as well

The array type of a variable depends on the bracket pairs that may
appear as part of the type at the beginning of a variable declaration,
or as part of the declarator for the variable, or both. Specifically,
in the declaration of a field, formal parameter, local variable, or
record component (8.3, 8.4.1, 9.3, 9.4, 14.4.1, 14.14.2, 15.27.1,
8.10.1), the array type of the variable is denoted by <...>

Now, this text is inconsistent with 8.10.1.

With best regards,
Tagir Valeev.
[1] http://cr.openjdk.java.net/~gbierman/jep384/jep384-20200506/specs/records-jls.html#jls-10.2

On Fri, Jul 24, 2020 at 10:55 AM Tagir Valeev <amaembo at gmail.com> wrote:
> Hello!
> The JLS 14 record preview spec allows C-style array declaration in
> components (like record R(int x[])) [1]:
> RecordComponent:
>   { VariableModifier } UnannType VariableDeclaratorId
>   VariableArityRecordComponent
> VariableDeclaratorId:
>   Identifier [ Dims ]
> However, it appears that JLS 15 draft spec doesn't allow it anymore [2]
> RecordComponent:
>   { Annotation } UnannType Identifier
>   VariableArityRecordComponent
> This change is not listed in the draft spec prolog in "The changes are
> the same as those in the first preview of Records in Java SE 14,
> except for the following", so I overlooked it when updated the records
> support in IntelliJ IDEA. Is this intended change? If yes, then
> probably the changes section should be updated to include it as well.
> I must say that I heavily support this change. Supporting C-style
> array declaration in records adds complexity in many places of our
> codebase and introduces subtle bugs. It's somewhat depressing to fix
> all of them, knowing that nobody would use this anyway.
> With best regards,
> Tagir Valeev.
> [1] https://docs.oracle.com/javase/specs/jls/se14/preview/specs/records-jls.html#jls-8.10.1
> [2] http://cr.openjdk.java.net/~gbierman/jep384/jep384-20200506/specs/records-jls.html#jls-8.10.1

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