Function GrB_Vector_assign_UDT 

pub unsafe extern "C" fn GrB_Vector_assign_UDT(
    w: GrB_Vector,
    mask: GrB_Vector,
    accum: GrB_BinaryOp,
    x: *mut c_void,
    I_: *const GrB_Index,
    ni: GrB_Index,
    desc: GrB_Descriptor,
) -> GrB_Info