{"ast_node_type":"other","tokens":[{"end":24,"kind":"keyword","start":0,"text":"///"}]}
///   &vec1[idx1]; // Ok
/// fn f<I1: Idx, I2: Idx>(vec1: IndexVec<I1, u8>, idx1: I1, idx2: I2) {
///   &vec1[idx2]; // Compile error!