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I've tried to extract it like

dims!
    :   (options{greedy=true; }:
            ({LA(1) == AT}? annotations
            | )
                lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK
        )+
    ;

and

dims
    :   (options{greedy=true; }:
            ({LA(1) == AT}? annotations
            | )
                lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK
        )+
    ;

but I face problem with tree structure: array declaration is not included into typespec or missed completely. I suppose it should be fixed with custom parsing structure like we use for TYPE and for lots of rules

Expected:

( Expression ) should be extracted into java code like in https://github.com/sabaka/checkstyle/blob/2d406453da73c4c34a4d328b2ea5f4bfc2d8b577/src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammars/java8/InputMethodReferences5_LeftPart.java according to
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-Expression

Note: ( and ) is LPAREN and RPAREN

ClassInstanceCreationExpression and ArrayCreationExpression should be extracted into java code like in https://github.com/sabaka/checkstyle/blob/2d406453da73c4c34a4d328b2ea5f4bfc2d8b577/src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammars/java8/InputMethodReferences5_LeftPart.java according to
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-ClassInstanceCreationExpression
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-ArrayCreationExpression

MethodInvocation and MethodReference should be extracted into java code like in https://github.com/sabaka/checkstyle/blob/2d406453da73c4c34a4d328b2ea5f4bfc2d8b577/src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammars/java8/InputMethodReferences5_LeftPart.java according to
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-MethodInvocation
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-MethodReference

https://github.com/sabaka/checkstyle/blob/2d406453da73c4c34a4d328b2ea5f4bfc2d8b577/src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammars/java8/InputMethodReferences5_LeftPart.java

this one already too long and should be split into several different files. Test have to be updated

FieldAccess and ArrayAccess should be extracted into java code like in https://github.com/sabaka/checkstyle/blob/2d406453da73c4c34a4d328b2ea5f4bfc2d8b577/src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammars/java8/InputMethodReferences5_LeftPart.java according to
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-FieldAccess
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-ArrayAccess