checker/tests/wpi-testchecker/non-annotated/InnerTypeTest.java

public class InnerTypeTest {
  public static String toStringQuoted(Object[] a) {
    return toString(a, true);
  }

  public static String toString(Object[] a, boolean quoted) {
    if (a == null) {
      return "null";
    }
    StringBuffer sb = new StringBuffer();
    return sb.toString();
  }

  public void bar() {
    assert InnerTypeTest.toStringQuoted((Object[]) null).equals("null");
  }
}