IGNORE {
            @Nullable
            @Override
            public HashCode determineNonJarFingerprint(HashCode original) {
                return null;
            }
        },
        USE_FILE_HASH {
            @Override
            public HashCode determineNonJarFingerprint(HashCode original) {
                return original;
            }
        };

        @Nullable

      assertErrorMessage(
          e,
          "the Object#hashCode ("
              + a.hashCode()
              + ") of "
              + a
              + " [group 1, item 1] must be equal to the Object#hashCode ("
              + b.hashCode()
              + ") of "
              + b);
      return;
    }
    fail("Should get invalid hashCode error");
  }

  public void testNullEqualityGroup() {

        }

        @Override
        public int hashCode() {
            int result = group != null ? group.hashCode() : 0;
            result = 31 * result + (name != null ? name.hashCode() : 0);
            result = 31 * result + (version != null ? version.hashCode() : 0);
            result = 31 * result + (fileName != null ? fileName.hashCode() : 0);
            result = 31 * result + (regex ? 1 : 0);

            int hashCode = artifact.getComponentIdentifier().hashCode();
            hashCode = 31 * hashCode + artifact.getFileName().hashCode();
            hashCode = 31 * hashCode + repositoryId.hashCode();
            return hashCode;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) {
                return true;
            }

            private final int hashCode;

            public CacheKey(List<ImmutableAttributes> variantAttributes, ImmutableAttributes requested) {
                this.variantAttributes = variantAttributes;
                this.requested = requested;
                this.hashCode = variantAttributes.hashCode() ^ requested.hashCode();
            }

            @Override

    public boolean apply(CharSequence t) {
      return pattern.matcher(t).find();
    }

    @Override
    public int hashCode() {
      // Pattern uses Object.hashCode, so we have to reach
      // inside to build a hashCode consistent with equals.

      return Objects.hashCode(pattern.pattern(), pattern.flags());
    }

    @Override
    public boolean equals(@CheckForNull Object obj) {

    int hashCode = 0;

    for (int i = 0; i < n; i++) {
      // requireNonNull is safe because the first `n` elements have been filled in.
      Entry<K, V> entry = requireNonNull(entryArray[i]);
      K key = entry.getKey();
      V value = entry.getValue();
      checkEntryNotNull(key, value);
      int keyHash = key.hashCode();
      int valueHash = value.hashCode();

    public boolean apply(CharSequence t) {
      return pattern.matcher(t).find();
    }

    @Override
    public int hashCode() {
      // Pattern uses Object.hashCode, so we have to reach
      // inside to build a hashCode consistent with equals.

      return Objects.hashCode(pattern.pattern(), pattern.flags());
    }

    @Override
    public boolean equals(@CheckForNull Object obj) {

        return f.equals(that.f) && g.equals(that.g);
      }
      return false;
    }

    @Override
    public int hashCode() {
      return f.hashCode() ^ g.hashCode();
    }

    @Override
    public String toString() {
      // TODO(cpovirk): maybe make this look like the method call does ("Functions.compose(...)")
      return g + "(" + f + ")";

        return f.equals(that.f) && g.equals(that.g);
      }
      return false;
    }

    @Override
    public int hashCode() {
      return f.hashCode() ^ g.hashCode();
    }

    @Override
    public String toString() {
      // TODO(cpovirk): maybe make this look like the method call does ("Functions.compose(...)")
      return g + "(" + f + ")";