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https://issues.apache.org/jira/browse/VELOCITY-874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15275916#comment-15275916
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Sergiu Dumitriu commented on VELOCITY-874:
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Probably because {{-}} is a valid variable name character:
{noformat}
#set ($some-var = 42)
$some-var -> 42
{noformat}
> Subtraction doesn't work as expected
> ------------------------------------
>
> Key: VELOCITY-874
> URL: https://issues.apache.org/jira/browse/VELOCITY-874
> Project: Velocity
> Issue Type: Bug
> Environment: VTL in user macro in Atlassian Confluence 5.9.4
> Reporter: Alexander Rosenberg
>
> This works as expected:
> {noformat}
> ## @noparams
> #set ($n = 5)
> #set ($m = $n+1)
> <p>$m</p>
> {noformat}
> Output: {{<p>6</p>}}
> However, subtraction doesn't work:
> {noformat}
> ## @noparams
> #set ($n = 5)
> #set ($m = $n-1)
> <p>$m</p>
> {noformat}
> Output: {{<p>$m</p>}}
> From [SO Q&A
> #15448108|http://stackoverflow.com/questions/15448108/subtraction-is-not-working-with-velocity-template],
> it appears that this behavior is due to the parser treating the
> hyphen/dash/minus-sign as part of the identifier, but certainly an exception
> should be made for when the "identifier" ends with only digits and/or hyphens.
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