Class NativeTypeVariableEquals

output/java_guava/1.4.16/Types.java:662–664

Per https://code.google.com/p/guava-libraries/issues/detail?id=1635, In JDK 1.7.0_51-b13, TypeVariableImpl.equals() is changed to no longer be equal to custom TypeVariable implementations. As a result, we need to make sure our TypeVariable implementation respects symmetry. Moreover, we don't want to

  static final class NativeTypeVariableEquals<X> {
    static final boolean NATIVE_TYPE_VARIABLE_ONLY = ! NativeTypeVariableEquals.class.getTypeParameters() [0].equals(newArtificialTypeVariable(NativeTypeVariableEquals.class, "X"));
  }

  private Types() {}
}