```if let Some(display) = optional_display.as_mut(...
# developmentw
witty-crayon-22786
10/18/2018, 11:16 PM Copy code
if let Some(display) = optional_display.as_mut() {
..
}witty-crayon-22786
10/18/2018, 11:16 PMif let Some(display) = optional_display.as_mut() {
..
}