pub unsafe extern "C" fn GxB_Col_subassign(
C: *mut GB_Matrix_opaque,
mask: *mut GB_Vector_opaque,
accum: *mut GB_BinaryOp_opaque,
u: *mut GB_Vector_opaque,
I: *const u64,
ni: u64,
j: u64,
desc: *mut GB_Descriptor_opaque
) -> i32