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https://issues.apache.org/jira/browse/VELOCITY-926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17023127#comment-17023127
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Simon Urli commented on VELOCITY-926:
-------------------------------------

Actually what [~tmortagne] didn't mention is that it also impacts the global 
variables, so the following:
{noformat}
#macro (myMacro $myvar)
#end

#set ($myvar = "value")
#myMacro()
$myvar
{noformat}

also produces:
  * Before VELOCITY-926 and in 1.7: "value"
  * After VELOCITY-926: $myvar



> Regression: Macro arguments names cannot collide with external references 
> names
> -------------------------------------------------------------------------------
>
>                 Key: VELOCITY-926
>                 URL: https://issues.apache.org/jira/browse/VELOCITY-926
>             Project: Velocity
>          Issue Type: Bug
>          Components: Engine
>    Affects Versions: 2.0, 2.1
>            Reporter: Claude Brisson
>            Assignee: Claude Brisson
>            Priority: Major
>             Fix For: 2.2
>
>
> Consider the following example:
> {code}
> #macro( test $foo $bar )
>   $foo $bar
> #end
> #set($foo = 'foo')
> #set($bar = 'bar')
> #test( $bar, $foo )
> {code}
> The expected result would be "{{bar foo}}", but since 2.0 we get the 
> incorrect result "{{bar bar}}", as if the first inner {{$foo}} macro argument 
> was overwritting the second argument evaluation.



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