# Julia 1.6 UndefVarError: .. not defined

**URL:** <https://discourse.julialang.org/t/julia-1-6-undefvarerror-not-defined/64085>\
**Category:** General Usage\
**Created:** [July 5, 2021, 3:08pm UTC](https://discourse.julialang.org/t/julia-1-6-undefvarerror-not-defined/64085 "2021-07-05T15:08:22Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![reemmasoud123](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/reemmasoud123/32/26181_2.png) [@reemmasoud123](https://discourse.julialang.org/u/reemmasoud123)\
**Post date:** [July 5, 2021, 3:08pm UTC](https://discourse.julialang.org/t/julia-1-6-undefvarerror-not-defined/64085/1 "2021-07-05T15:08:22Z")

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I just downloaded Julia 1.6 and the syntax:  
[-1. .1]  
that expresses a range of numbers which used to work in Julia 1.5 no longer works. Does anyone know what the latest syntax for “. .” is?  
I need it as I am using the ReinforcementLearning function “Space”:  
Space([-1.0 . . 1,1 . . DIM])

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**Author:** ![StefanKarpinski](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stefankarpinski/32/24_2.png) [@StefanKarpinski](https://discourse.julialang.org/u/StefanKarpinski)\
**Post date:** [July 5, 2021, 3:12pm UTC](https://discourse.julialang.org/t/julia-1-6-undefvarerror-not-defined/64085/2 "2021-07-05T15:12:54Z")

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Are you thinking of `-1:1`?

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**Author:** ![ChrisRackauckas](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/chrisrackauckas/32/77_2.png) [@ChrisRackauckas](https://discourse.julialang.org/u/ChrisRackauckas)\
**Post date:** [July 5, 2021, 3:33pm UTC](https://discourse.julialang.org/t/julia-1-6-undefvarerror-not-defined/64085/3 "2021-07-05T15:33:21Z")

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> [@reemmasoud123](#):
>
> that expresses a range of numbers which used to work in Julia 1.5 no longer works. Does anyone know what the latest syntax for “. .” is?

That was never a syntax in Base Julia. Some packages do stuff with the operator, but standard Julia does not.

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**Author:** ![jling](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jling/32/212909_2.png) [@jling](https://discourse.julialang.org/u/jling)\
**Post date:** [July 5, 2021, 4:18pm UTC](https://discourse.julialang.org/t/julia-1-6-undefvarerror-not-defined/64085/4 "2021-07-05T16:18:21Z")

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is that Bash syntax or Swift or C#？

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**Author:** ![findmyway](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/findmyway/32/4946_2.png) [@findmyway](https://discourse.julialang.org/u/findmyway)\
**Post date:** [July 6, 2021, 4:42am UTC](https://discourse.julialang.org/t/julia-1-6-undefvarerror-not-defined/64085/5 "2021-07-06T04:42:11Z")

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That syntax is introduced in [`IntervalSets.jl`](https://github.com/JuliaMath/IntervalSets.jl).

> [@reemmasoud123](#):
>
> which used to work in Julia 1.5 no longer works

It should work on both versions. I guess you forgot `using IntervalSets` first.

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**Author:** ![reemmasoud123](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/reemmasoud123/32/26181_2.png) [@reemmasoud123](https://discourse.julialang.org/u/reemmasoud123)\
**Post date:** [July 6, 2021, 8:56am UTC](https://discourse.julialang.org/t/julia-1-6-undefvarerror-not-defined/64085/6 "2021-07-06T08:56:00Z")

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Thanks a lot. It worked, I was using using IntervalArithmetic.