Template Cover example does not work

[brandond]

The example specifies both lambda and optimistic, which is not allowed:

  cover.template:
    - Invalid config for [cover.template]: Cannot specify more than one of lambda, optimistic.

Additionally, the generated c++ code (if I remove optimistic) does not seem to be valid:

binary_sensor:
  - platform: gpio
    id: garage_door
    device_class: garage_door
    name: Garage Door
    pin:
      number: 12
      inverted: False
      mode: INPUT_PULLUP

switch:
  - platform: gpio
    id: garage_door_switch
    name: Garage Door Switch
    pin: 27

cover:
  - platform: template
    id: garage_door_opener
    name: "Garage Door Opener"
    lambda: >-
      if (id(garage_door).value) {
        return cover::COVER_CLOSED;
      } else {
        return cover::COVER_OPEN;
      }
    open_action:
      - switch.turn_on:
          id: garage_door_switch
      - delay: 1s
      - switch.turn_off:
          id: garage_door_switch
    close_action:
      - switch.turn_on:
          id: garage_door_switch
      - delay: 1s
      - switch.turn_off:
          id: garage_door_switch
      - delay: 1s
      - switch.turn_on:
          id: garage_door_switch
      - delay: 1s
      - switch.turn_off:
          id: garage_door_switch
    stop_action:
      - switch.turn_on:
          id: garage_door_switch
      - delay: 1s
      - switch.turn_off:
          id: garage_door_switch

results in:

Compiling .pioenvs/garage/src/main.cpp.o
src/main.cpp: In function 'void setup()':
src/main.cpp:24:26: error: expected unqualified-id before '->' token
template_cover.template->set_state_lambda([=]() {
^
*** [.pioenvs/garage/src/main.cpp.o] Error 1

from the following code:

  auto template_cover = App.make_template_cover("Garage Door Opener");
  auto gpio_switch = App.make_gpio_switch("Garage Door Switch", 27);
  auto *garage_door_switch = gpio_switch.switch_;
  auto gpio_binary_sensor = App.make_gpio_binary_sensor("Garage Door", GPIOInputPin(12, INPUT_PULLUP, false));
  auto *garage_door = gpio_binary_sensor.gpio;
  garage_door->set_device_class("garage_door");
  template_cover.template->set_state_lambda([=]() {
      if (garage_door->value) {
        return cover::COVER_CLOSED;
      } else {
        return cover::COVER_OPEN;
      }
  });