Function GrB_Vector_apply_IndexOp_INT8 

pub unsafe extern "C" fn GrB_Vector_apply_IndexOp_INT8(
    w: GrB_Vector,
    mask: GrB_Vector,
    accum: GrB_BinaryOp,
    op: GrB_IndexUnaryOp,
    u: GrB_Vector,
    y: i8,
    desc: GrB_Descriptor,
) -> GrB_Info