{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
                // SAFETY: `write_from_iter` doesn't touch `self`. It only touches the slice we just
                let mem = self.alloc_raw(Layout::array::<T>(len).unwrap()) as *mut T;
                // reserved. If the iterator panics or doesn't output `len` elements, this will