# Julia 0.7 : how to use iterate() to remove warning in Combinatorics.Combinations?

**URL:** <https://discourse.julialang.org/t/julia-0-7-how-to-use-iterate-to-remove-warning-in-combinatorics-combinations/13089>\
**Category:** General Usage\
**Tags:** warning\
**Created:** [August 9, 2018, 1:12pm UTC](https://discourse.julialang.org/t/julia-0-7-how-to-use-iterate-to-remove-warning-in-combinatorics-combinations/13089 "2018-08-09T13:12:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Fred](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/fred/32/14175_2.png) [@Fred](https://discourse.julialang.org/u/Fred)\
**Post date:** [August 9, 2018, 1:12pm UTC](https://discourse.julialang.org/t/julia-0-7-how-to-use-iterate-to-remove-warning-in-combinatorics-combinations/13089/1 "2018-08-09T13:12:09Z")

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Hi !

In Julia 0.7, the following code produce no error in the REPL

```julia
julia> using Combinatorics
julia> for c in Combinatorics.Combinations(1:3,2)
           println(c)
       end
[1, 2]
[1, 3]
[2, 3]

```

If I execute the code in a file, I have a warning

```julia
$ julia combination-04.jl 
┌ Warning: The start/next/done iteration protocol is deprecated. Implement `iterate(::Combinatorics.Combinations{UnitRange{Int64}})`.
│ caller = ip:0x0
└ @ Core :-1
[1, 2]
[1, 3]
[2, 3]

```

How should I use iterate() to remove the warning ?

Thanks !

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**Author:** ![laborg](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/laborg/32/5474_2.png) [@laborg](https://discourse.julialang.org/u/laborg)\
**Post date:** [August 9, 2018, 1:27pm UTC](https://discourse.julialang.org/t/julia-0-7-how-to-use-iterate-to-remove-warning-in-combinatorics-combinations/13089/2 "2018-08-09T13:27:34Z")

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On my 0.7 REPL I get the error at least the first time i run the code and that’s expected. The source of the deprecation is within Combinatorics.jl, so until this package has been updated there’s not much you can do about it (except for a pull request of course).  
If you just want to silence (all) deprecation warnings run the script with `--depwarn=no`

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**Author:** ![Fred](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/fred/32/14175_2.png) [@Fred](https://discourse.julialang.org/u/Fred)\
**Post date:** [August 9, 2018, 1:29pm UTC](https://discourse.julialang.org/t/julia-0-7-how-to-use-iterate-to-remove-warning-in-combinatorics-combinations/13089/3 "2018-08-09T13:29:59Z")

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@laborg thank you, it was unclear for me where the error was located.

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**Author:** ![garrison](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/garrison/32/209519_2.png) [@garrison](https://discourse.julialang.org/u/garrison)\
**Post date:** [August 9, 2018, 1:49pm UTC](https://discourse.julialang.org/t/julia-0-7-how-to-use-iterate-to-remove-warning-in-combinatorics-combinations/13089/4 "2018-08-09T13:49:38Z")

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Ref [https://github.com/JuliaMath/Combinatorics.jl/issues/66](https://github.com/JuliaMath/Combinatorics.jl/issues/66)