remove and return the last item of a collection
| std::peek | returns the last item of a collection without removing it |
| std::drop | removes the last item of a collection without returning it |
| std::push | add a single item at the end of a collection |
| std::put | adds a single item at the front of a collection |
| std_types::generic_list | removes and returns the last element of the list |
| std_types::list | removes and returns the last item of a non-empty list |