{"ast_node_type":"other","tokens":[{"end":13,"kind":"keyword","start":0,"text":"#[inline]"}]}
    #[inline]
impl<I: Idx, T, R: IntoSliceIdx<I, [T]>> IndexMut<R> for IndexSlice<I, T> {
    fn index_mut(&mut self, index: R) -> &mut Self::Output {