Issue #9848 has been updated by Francisco  Lozano.

I would like to bump this too. I think the conditional logic is error-prone and 
really hacky to write. I've actually discovered this is not possible very 
recently, with geppetto profile change (updating from 2.7 to 3.x) and I'm 
fixing my puppet modules urgently. 

----------------------------------------
Bug #9848: Variable interpolation in class parameters seems random
https://projects.puppetlabs.com/issues/9848#change-95606

* Author: Carlos Sanchez
* Status: Accepted
* Priority: Normal
* Assignee: 
* Category: parameterized classes
* Target version: 3.x
* Affected Puppet version: 2.7.1
* Keywords: parameter variable class interpolation evaluation BD
* 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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