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https://issues.apache.org/jira/browse/VELOCITY-542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12492680
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Nathan Bubna commented on VELOCITY-542:
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I should note that i didn't suggest any course of action, because i'm
ambivalent about the state of this. This is a "feature" that i believe few
know about or use. While i don't think we should change it in the 1.x series,
i wouldn't oppose dropping '-' from the set of valid reference characters in
2.0. Of course, I wouldn't champion that either, so i won't re-open and
assign this to that version myself.
> minus sign in #set requires spaces to surround it
> -------------------------------------------------
>
> Key: VELOCITY-542
> URL: https://issues.apache.org/jira/browse/VELOCITY-542
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.5
> Reporter: Will Glass-Husain
> Priority: Minor
>
> The following example:
> #set($thisCampNumber = 10)
> #set($nextCampNumber = $thisCampNumber+1)
> #set($previousCampNumber = $thisCampNumber-1)
> #set($previousCampNumberB = $thisCampNumber - 1)
> 1: $thisCampNumber<br>
> 2: $nextCampNumber<br>
> 3: $previousCampNumber<br>
> 4: $previousCampNumberB<br>
> produces this result
> 1: 10
> 2: 11
> 3: $previousCampNumber
> 4: 9
> Note that using a minus sign in a #set statement does not work if there are
> no spaces around it. (however, the same is not true for +).
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