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https://issues.apache.org/jira/browse/VELOCITY-684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863424#action_12863424
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Sergiu Dumitriu commented on VELOCITY-684:
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See http://wiki.apache.org/velocity/MacroEvaluationStrategy
> Passing a map literal to a macro call forbids altering the map in any way,
> while maps bound to an actual parameter may be changed
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: VELOCITY-684
> URL: https://issues.apache.org/jira/browse/VELOCITY-684
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.6.1
> Reporter: Sergiu Dumitriu
>
> For example, with the following macro:
> #macro(changeMap $map)
> Before: $map.someKey
> #set($map.someKey = 'new value')
> After: $map.someKey
> #end
> This call works as expected:
> #set($actualMap = {'someKey' : 'old value'})
> #changeMap($actualMap) => old value, then new value
> But this one doesn't:
> #changeMap({'someKey' : 'old value'}) => old value, then again old value
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