Function draw_station_lines 

fn draw_station_lines<'a, F>(
    vertical_offset: f32,
    stroke: Stroke,
    painter: &mut Painter,
    screen_rect: &Rect,
    zoom: f32,
    to_draw: &[(Entity, f32)],
    pixels_per_point: f32,
    text_color: Color32,
    get_station_name: F,
)
where
    F: FnMut(Entity) -> Option<&'a str>,