# WARNING: deprecated syntax "\_ as an rvalue"

**URL:** <https://discourse.julialang.org/t/warning-deprecated-syntax---as-an-rvalue/3090>\
**Category:** General Usage\
**Tags:** question\
**Created:** [April 6, 2017, 2:35pm UTC](https://discourse.julialang.org/t/warning-deprecated-syntax---as-an-rvalue/3090 "2017-04-06T14:35:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![juliohm](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/juliohm/32/215266_2.png) [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Post date:** [April 6, 2017, 2:35pm UTC](https://discourse.julialang.org/t/warning-deprecated-syntax---as-an-rvalue/3090/1 "2017-04-06T14:35:43Z")

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I am trying Julia v0.6 and this warning is new. It doesn’t have a line number attached to it, so I don’t know where I have to look in the source.

I know that the identifier `_` will be used to discard values in the future like in Haskell (if I am not confusing the languages). Why the warning?

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**Author:** ![yuyichao](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/yuyichao/32/20_2.png) [@yuyichao](https://discourse.julialang.org/u/yuyichao)\
**Post date:** [April 6, 2017, 2:40pm UTC](https://discourse.julialang.org/t/warning-deprecated-syntax---as-an-rvalue/3090/2 "2017-04-06T14:40:57Z")

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Because the warning is telling you that you are reading from it.