PS D:\CS\test> cat src/Test.java                                                 
import java.util.PriorityQueue;
import java.util.Queue;

public class Test {
    public void testParenPad(Point p) {
        final Queue<Integer> q = new PriorityQueue<>();
        q.add(1);
        q.add(2);
        for (Integer i : q) {
            var _ = q.poll();  // violation
        }
    }
}
PS D:\CS\test> cat config.xml                                                    
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<module name="Checker">
    <property name="charset" value="UTF-8"/>
    <module name="TreeWalker">
        <module name="FinalLocalVariable"/>
    </module>
</module>
PS D:\CS\test> java  -jar checkstyle-10.17.0-all.jar -c config.xml  src/Test.java
Starting audit...
[ERROR] D:\CS\test\src\Test.java:10:17: Variable '_' should be declared final. [FinalLocalVariable]
Audit done.
Checkstyle ends with 1 errors.