DSL EXPRESSION:
$z = [5,6,7,8,9][1]


AST:
"block" [tt:block] [nt:StatementBlock]
    "=" [tt:equals] [nt:Assignment]
        "$z" [tt:field_name] [nt:DirectFieldValue]
        "[]" [tt:[]] [nt:ArrayOrMapIndexAccess]
            "[]" [tt:[]] [nt:ArrayLiteral]
                "5" [tt:int_literal] [nt:int_literal]
                "6" [tt:int_literal] [nt:int_literal]
                "7" [tt:int_literal] [nt:int_literal]
                "8" [tt:int_literal] [nt:int_literal]
                "9" [tt:int_literal] [nt:int_literal]
            "1" [tt:int_literal] [nt:int_literal]

