assertThrows(
            IllegalArgumentException.class,
            () -> Maps.uniqueIndex(ImmutableSet.of("one", "uno"), Functions.constant(1)));
    assertThat(expected).hasMessageThat().contains("Multimaps.index");
  }

  /** Null values are not allowed. */
  public void testUniqueIndexNullValue() {
    List<@Nullable String> listWithNull = Lists.newArrayList((String) null);
    assertThrows(

	public static final fun of (Ljava/util/Map;)Lokhttp3/Headers;
	public static final fun of ([Ljava/lang/String;)Lokhttp3/Headers;
	public final fun size ()I
	public final fun toMultimap ()Ljava/util/Map;
	public fun toString ()Ljava/lang/String;
	public final fun value (I)Ljava/lang/String;
	public final fun values (Ljava/lang/String;)Ljava/util/List;
}

## Version 3.4.0

_2016-07-08_

 *  New: Support dynamic table size changes to HPACK Encoder.
 *  Fix: Use `TreeMap` in `Headers.toMultimap()`. This makes string lookups on
    the returned map case-insensitive.
 *  Fix: Don't share the OkHttpClient's `Dispatcher` in `HttpURLConnection`.


## Version 3.4.0-RC1

_2016-07-02_

	public static final fun of (Ljava/util/Map;)Lokhttp3/Headers;
	public static final fun of ([Ljava/lang/String;)Lokhttp3/Headers;
	public final fun size ()I
	public final fun toMultimap ()Ljava/util/Map;
	public fun toString ()Ljava/lang/String;
	public final fun value (I)Ljava/lang/String;
	public final fun values (Ljava/lang/String;)Ljava/util/List;
}

  <mime-type type="application/vnd.mseq">
    <glob pattern="*.mseq"/>
  </mime-type>
  <mime-type type="application/vnd.msign"/>
  <mime-type type="application/vnd.multiad.creator"/>
  <mime-type type="application/vnd.multiad.creator.cif"/>
  <mime-type type="application/vnd.music-niff"/>
  <mime-type type="application/vnd.musician">
    <glob pattern="*.mus"/>
  </mime-type>

on-S3-Sealed-Key":"IAAfANwBqlslXkn9TXOV/b/2SGWAz5sSIGb7JxdYZRv==","X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm":"DAREv2-HMAC-SHA256","content-type":"application/octet-stream"}},{"Bucket":"buck1","Name":"go_113/src/cmd/go/testdata/src/multimain/multimain_test.go","UserDef":{"X-Minio-Internal-Server-Side-Encryption-Iv":"5FguKSbSrWPJAcYVeC8g=","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id":"my-minio-key","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key":"IAAfAO5oY9a8PJ...