{"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"///"}]}
///    length of the subslice.
///    However, this yields a `Place` of type `[T]`, and additionally sets the metadata to be the
///  - [`Index`](ProjectionElem::Index): Like `ConstantIndex`, only legal on `[T; N]` or `[T]`.