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

Maurizio Cimadamore maurizio.cimadamore at oracle.com
Fri Sep 18 15:23:35 UTC 2020

+1 on this - as Brian says - part of a long-term battle against old 
syntax - note that at some point in Java 7 we dropped support for 
C-style array syntax on varargs decl - e.g.:

void m(int n, String... args[])



On 24/07/2020 13:43, Brian Goetz wrote:
> As we've added new places or ways to declare variables (e.g., var, 
> record components), we've been trying to not propagate this syntax 
> mistake.  So I agree that this is the right behavior; I think the 
> change just got lost in the shuffle.
> On 7/23/2020 11:55 PM, Tagir Valeev 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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