Insert element x at the beginning of list items.
#include <list>
items.emplace_front(x);
items.push_front(x);
items.Insert(0, x);
items = [x, items]
items = append(items, x) copy(items[1:], items) items[0] = x
items = append([]T{x}, items...)
items2 = x : items
items = [x, ...items];
items.unshift(x);
items.insert(0,x);
unshift @items, $x
items = [x] + items
items.prepend(x)
items.unshift(x)
use std::collections::VecDeque;
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