checker/tests/nullness/Issue986.java

// Test case for issue #986:
// https://github.com/typetools/checker-framework/issues/986

// @skip-test until the issue is fixed

public class Issue986 {

  public static void main(String[] args) {
    String array[] = new String[3];
    array[0].length(); // NPE here
  }

  // Flow should refine @MonotonicNonNull component types to @NonNull.
  void testArr4(@NonNull Object @NonNull [] nno1, @MonotonicNonNull Object @NonNull [] lnno1) {
    @MonotonicNonNull Object[] lnno2;
    @NonNull Object[] nno2;
    nno2 = nno1;
    lnno2 = lnno1;
    lnno2 = nno1;
    // :: error: (assignment)
    nno2 = lnno1;
    lnno2 = NullnessUtil.castNonNullDeep(nno1);
    nno2 = NullnessUtil.castNonNullDeep(lnno1);
    lnno2 = NullnessUtil.castNonNullDeep(nno1);
    nno2 = NullnessUtil.castNonNullDeep(lnno1);
  }

  // Flow should refine @MonotonicNonNull component types to @NonNull.
  // This is a prerequisite for issue #986 (or for workarounds to issue #986).
  void testArr5(@MonotonicNonNull Object @NonNull [] a) {
    @MonotonicNonNull Object[] l5 = NullnessUtil.castNonNullDeep(a);
    @NonNull Object[] l6 = l5;
    @NonNull Object[] l7 = NullnessUtil.castNonNullDeep(a);
  }
}