ReturnValue.java

public class ReturnValue {
  public int getX() {
    int y=0;
    return <warning descr="'y' should probably not be returned from method 'getX'">y</warning>;
  }

  interface I {
    int m();
  }

  public int getY() {
    I i = () -> {
      int x = 0;
      return x;
    };
    return i.m();
  }
}