Method expect

src/main/java/com/google/gson/stream/JsonReader.java:320–326

Consumes expected.

(JsonToken expected)

   * Consumes {@code expected}.
   */
  private void expect(JsonToken expected) throws IOException {
    quickPeek();
    if (token != expected) {
      throw new IllegalStateException("Expected " + expected + " but was " + peek());
    }
    advance();
  }

  /**
   * Returns true if the current array or object has another element.