Function GrB_Matrix_select_INT8 

pub unsafe extern "C" fn GrB_Matrix_select_INT8(
    C: GrB_Matrix,
    Mask: GrB_Matrix,
    accum: GrB_BinaryOp,
    op: GrB_IndexUnaryOp,
    A: GrB_Matrix,
    y: i8,
    desc: GrB_Descriptor,
) -> GrB_Info