use std::io::Cursor;
pub trait IncrementCursor {
fn increment(&mut self);
fn add(&mut self, n: u32);
}
impl IncrementCursor for Cursor<u32> {
fn increment(&mut self) {
self.set_position(self.position() + 1); }
fn add(&mut self, n: u32) {
self.set_position(self.position() + u64::from(n));
}
}