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https://issues.apache.org/jira/browse/VELOCITY-995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18088813#comment-18088813
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Claude Brisson commented on VELOCITY-995:
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I will also deprecate {{parser.allow_hyphen_in_identifiers=true}}
> Deprecate syntax constructs not planned for next major version
> --------------------------------------------------------------
>
> Key: VELOCITY-995
> URL: https://issues.apache.org/jira/browse/VELOCITY-995
> Project: Velocity
> Issue Type: Task
> Components: Engine
> Affects Versions: 2.5
> Reporter: Claude Brisson
> Priority: Major
> Fix For: 2.5
>
>
> Next engine major version will allow ${kotlin expression} constructs (at
> least, that's the goal). To go this route, we need to explicitly deprecate
> the syntax constructs.
> Introduce:
> - elvis operator
> Deprecate :
> - {{${foo|'bar'}}} => #if($foo)$foo#{else}bar#end
> - $foo.bar => ${foo.bar}
> - ${$foo.bar} => ${foo.bar}
> Syntax deprecation warnings should be gated, by {{runtime.deprecation.warn}},
> I will leave it to false by default for now but mention it in the docs, then
> 2.5.1 or 2.6 can turn it on.
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