{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"//"}]}
        // We produce a post-mono error if N > BUF_SIZE.
        // and if isn't, flush ensures that our empty buffer is now BUF_SIZE.
        let buf = unsafe { self.buffer_empty().first_chunk_mut::<N>().unwrap_unchecked() };