Issue #9848 has been updated by Patrick Carlisle.

Should this even be allowed? Semantically it seems weird to me. I'm inclined to 
agree with the argument jcbollinger gives in the linked email thread.
----------------------------------------
Bug #9848: Variable interpolation in class parameters seems random
https://projects.puppetlabs.com/issues/9848#change-56601

Author: Carlos Sanchez
Status: Accepted
Priority: Normal
Assignee: 
Category: parameterized classes
Target version: Telly
Affected Puppet version: 2.7.1
Keywords: parameter variable class interpolation evaluation
Branch: 


In class parameters, things like x="x", y="y${x}" don't always evaluate right 
(y="yx"), seems random. I'm using 2.7.1

<pre>
class test1(
    $servicex = "sonar",
    $logfoldera = "${homex}/logs",
    $logfoldere = "${homey}/logs",
    $logfolderh = "${homez}/logs",
    $logfolder = "${homex}/logs",
    $homex = "/var/${servicex}",
    $homey = "/var/${servicex}",
    $homez = "/var/${servicex}") {

    notice($homex)
    notice($homey)
    notice($homez)
    notice("-----")
    notice($logfoldera)
    notice($logfoldere)
    notice($logfolderh)
}
</pre>

output :

<pre>
notice: Scope(Class[Test1]): /var/sonar
notice: Scope(Class[Test1]): /var/sonar
notice: Scope(Class[Test1]): /var/sonar
notice: Scope(Class[Test1]): -----
notice: Scope(Class[Test1]): /var/sonar/logs
notice: Scope(Class[Test1]): /logs
notice: Scope(Class[Test1]): /logs
</pre>


Note the last two messages should print "/var/sonar/logs"
Ordering the paramenters in the order they are needed gets the same result.

Just by changing the name of the parameters from class test1 to test2 I get 
different evaluations of the variables, one is right and two are wrong, you can 
see that in [this gist](https://gist.github.com/1250837)

Commented on [the user 
list](https://groups.google.com/d/topic/puppet-users/x_BCxE6SQcM/discussion)



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