import java.util.function.Consumer;

public class TestMethodReferenceLetterClass {
   void boo() {
      Consumer var1 = R::foo;// 21
   }// 22
}

class 'TestMethodReferenceLetterClass' {
   method 'boo ()V' {
      5      4
      6      5
   }
}

Lines mapping:
21 <-> 5
22 <-> 6