Define(-1, {}, {feed1, feed1}, {add}, {}, true);
  EXPECT_EQ(TF_INVALID_ARGUMENT, TF_GetCode(s_));
  EXPECT_EQ(
      string("TF_Output feed1:0 appears more than once in the input list"),
      string(TF_Message(s_)));
}

TEST_F(CApiFunctionTest, DuplicateOutputNamesAreNotAllowed) {
  /*
   *                  |  |  |
   *                  v  v  /
   *                  add  /

		}
		// Test that we cannot unread any further.
		if err := r.UnreadByte(); err == nil {
			t.Errorf("n = %d: expected error on UnreadByte", n)
		}
	}
}

func TestUnreadByteOthers(t *testing.T) {
	// A list of readers to use in conjunction with UnreadByte.
	var readers = []func(*Reader, byte) ([]byte, error){
		(*Reader).ReadBytes,
		(*Reader).ReadSlice,
		func(r *Reader, delim byte) ([]byte, error) {