rule generation, in java, does not support variable arguments

write a rules like this:

``` antlr
rule1[String... mode] : // rule content ;

rule2 : rule1["read","write"] ;
```

This was working without problem with antlrv3.

In antlrv4, the generated ParserRuleContext is wrongly generated:

``` java
public static class rule1Context extends ParserRuleContext {
public String... mode;
// rest of the code
}
```

should be

``` java
public static class rule1Context extends ParserRuleContext
{
public String[] mode;
/// rest of the code
}
```

Reproduce the issue with the rule1 and rule2 grammar shown in the report, then trace generation of the Java ParserRuleContext for rule1. Confirm the generated context declares the variable argument as String[] mode rather than String... mode; no specific source file or test is named in the issue.

Written by the indexing model from the issue text.