{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"//"}]}
                // reserved. If the iterator panics or doesn't output `len` elements, this will
                // SAFETY: `write_from_iter` doesn't touch `self`. It only touches the slice we just
                // leave some unallocated slots in the arena, which is fine because we do not call