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https://issues.apache.org/jira/browse/VELOCITY-681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12666563#action_12666563
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Nathan Bubna commented on VELOCITY-681:
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Thanks for testing this out, Jarkko. Ok, if it worked in 1.5 and 1.6 but not
in 1.6.1, then i'm fine with this being added to the 1.6.x branch. In a bugfix
release, we should try to keep changes in behavior minimal. I think though,
that this is strange, surprising and uncommonly used enough that we should
leave it out of the trunk. We can just put a notice in the changelog that as
of 1.7, this behavior is no longer valid. Even after thinking about it for a
night, i'm convinced the current trunk treatment of #setting macro args is
superior.
> [regression] Changes on the macro parameters are not persisted outside the
> macro call
> -------------------------------------------------------------------------------------
>
> Key: VELOCITY-681
> URL: https://issues.apache.org/jira/browse/VELOCITY-681
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.6.1
> Reporter: Sergiu Dumitriu
> Priority: Critical
> Fix For: 1.6.2, 1.7
>
> Attachments: VELOCITY-681-1.6.patch, VELOCITY-681-trunk.patch
>
>
> The fix for VELOCITY-615 was too radical, since it completely disables
> #setting new values to the formal arguments. A minimalistic example that used
> to work up to 1.6 (but not with 1.6.1) is:
> {noformat}
> #macro(myMacro $result)
> #set($result = 'some value')
> #end
> #myMacro($x)
> $x
> {/noformat}
> which prints $x (as an undefined variable).
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