pub unsafe extern "C" fn GxB_Row_subassign(
C: *mut GB_Matrix_opaque,
mask: *mut GB_Vector_opaque,
accum: *mut GB_BinaryOp_opaque,
u: *mut GB_Vector_opaque,
i: u64,
J: *const u64,
nj: u64,
desc: *mut GB_Descriptor_opaque
) -> i32