Prior to JDK 16, the `javac` compiler accepted C-style array declarations in record components. The JLS 16 now forbids it. In particular, the compiler had accepted code such as:

```
    record R(int i[]) {}
```

This code is no longer acceptable according to the specification for JDK 16. Section 8.10.1 of the JLS 16 defines the syntax of a record component as:

```
RecordComponent:
    {RecordComponentModifier} UnannType Identifier
    VariableArityRecordComponent
VariableArityRecordComponent:
    {RecordComponentModifier} UnannType { Annotation } ... Identifier
RecordComponentModifier:
    Annotation
```
which clearly forbids C-style array declarations in record components. To fix this issue, the compiler has been synchronized with the JLS 16, so that C-style array declarations are no longer allowed in record components.