in TicketManagement/Resizing/Task/src/main.rs [1:13]
fn main() {
let mut v = Vec::with_capacity(2);
v.push(1);
v.push(2); // max capacity reached
assert_eq!(v.capacity(), 2);
v.push(3); // beyond capacity, needs to resize
// Can you guess what the new capacity will be?
// Beware that the standard library makes no guarantees about the
// algorithm used to resize the vector, so this may change in the future.
assert_eq!(v.capacity(), 4);
}