[Puppet Users] usage of '+>' ?

[udo waechter]

According to:
http://reductivelabs.com/trac/puppet/wiki/LanguageTutorial
one can use the  '+>' operator to add additional  values to a parameter.

In which cases does this actually work?
When i try to add the user www-data to the ssl-cert group:

  user{"www-data":
      groups +> "ssl-cert",
  }





Thanks,
udo.
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this does not work (.. Syntax error at '+>'; expected '}' at...). All examples in the docs add only other types to the 'require' parameters of types via this operator. Could it be that it does not work for all parameters? Or does the user-type do the "adding the user to the group" thing by itself?

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