About the Usage of altAnnotationQualifiedName in JavaParser

[CJunHub]

I am using the following for Java code parsing: https://github.com/antlr/grammars-v4/blob/master/java/java/JavaParser.g4

The code related to altAnnotationQualifiedName is as follows:

// ANNOTATIONS
altAnnotationQualifiedName
    : (identifier DOT)* '@' identifier
    ;

annotation
    : ('@' qualifiedName | altAnnotationQualifiedName) (
        '(' ( elementValuePairs | elementValue)? ')'
    )?
    ;

Question
Under what circumstances would altAnnotationQualifiedName be used? Java does not support the syntax xxx.xxx.xxx.@yyy, right?

[kaby76]

I cannot say how it would be used. But it seems that it may be an error, because I cannot see how the rule(s) were obtained from Annotation from the JLS. This is sort of the problem: people make changes thinking it's okay. Then, they pass it through a single example and declare "victory!"

Feel free to come up with an alternative refactoring.