{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"//"}]}
                // `opt_slice_ty.is_none()` => `slice.is_none()`.
                    self.check_array_pat_len(span, element_ty, expected, slice, len, min);
                // Note, though, that opt_slice_ty could be `Some(error_ty)`.