if you.pos() == marker:pos() and you.taking_stairs() then
    if verbose then
      crawl.mpr( dgn.feature_desc_at(x, y, "The") .. " vanishes " ..
                "just as you enter it!")
      return
    end
  end

LUARET2(you_pos, number, you.x_pos, you.y_pos)

LUARET1(you_taking_stairs, boolean,
        current_delay_action() == DELAY_ASCENDING_STAIRS
        || current_delay_action() == DELAY_DESCENDING_STAIRS)

    { "pos"         , you_pos },

    { "taking_stairs", you_taking_stairs },