@SuppressWarnings("UnusedTypeParameter") // It's used reflectively.
  static final class NativeTypeVariableEquals<X> {
    static final boolean NATIVE_TYPE_VARIABLE_ONLY =
        !NativeTypeVariableEquals.class.getTypeParameters()[0].equals(
            newArtificialTypeVariable(NativeTypeVariableEquals.class, "X"));

    private NativeTypeVariableEquals() {}
  }

  private Types() {}

  @SuppressWarnings("UnusedTypeParameter") // It's used reflectively.
  static final class NativeTypeVariableEquals<X> {
    static final boolean NATIVE_TYPE_VARIABLE_ONLY =
        !NativeTypeVariableEquals.class.getTypeParameters()[0].equals(
            newArtificialTypeVariable(NativeTypeVariableEquals.class, "X"));

    private NativeTypeVariableEquals() {}
  }

  private Types() {}

    private final EqualsTester tester = new EqualsTester();

    @CanIgnoreReturnValue
    TypeVariableEqualsTester addEqualityGroup(Type jvmType, Type... types) {
      if (Types.NativeTypeVariableEquals.NATIVE_TYPE_VARIABLE_ONLY) {
        tester.addEqualityGroup(jvmType);
        tester.addEqualityGroup((Object[]) types);
      } else {
        tester.addEqualityGroup(Lists.asList(jvmType, types).toArray());

         * UnsupportedOperationException. Frameworks requiring annotation preservation
         * should use the original TypeVariable when bounds haven't changed.
         */
        if (Types.NativeTypeVariableEquals.NATIVE_TYPE_VARIABLE_ONLY
            && Arrays.equals(bounds, resolvedBounds)) {
          return var;
        }
        return Types.newArtificialTypeVariable(

         * UnsupportedOperationException. Frameworks requiring annotation preservation
         * should use the original TypeVariable when bounds haven't changed.
         */
        if (Types.NativeTypeVariableEquals.NATIVE_TYPE_VARIABLE_ONLY
            && Arrays.equals(bounds, resolvedBounds)) {
          return var;
        }
        return Types.newArtificialTypeVariable(