Function LAGraph_RegularPathQuery 

pub unsafe extern "C" fn LAGraph_RegularPathQuery(
    reachable: *mut GrB_Vector,
    R: *mut LAGraph_Graph,
    nl: usize,
    QS: *const GrB_Index,
    nqs: usize,
    QF: *const GrB_Index,
    nqf: usize,
    G: *mut LAGraph_Graph,
    S: *const GrB_Index,
    ns: usize,
    msg: *mut c_char,
) -> c_int