Puppet users - Jun 2011 - No matching value for selector param '1' with case and ? statements

I have been getting an error message " No matching value for selector
param ''1''" when ever I use the following code in a class.
What is
strange is if I run the code directly with "puppet -v filename" where
the code is in the filename or I stick the code in the nodes.pp file
it works perfectly.  When I put it into a class and include in the
node it breaks.

   $client_env = $hostname ? {
      /^mr/     => "mirror",
      default   => "UNKNOWN"
   }
   info "hostname=[${hostname}], client_env=[${client_env}]"

I''m running Puppet 2.6.8, Ruby 1.8.5, and Passenger 2.2.11.

Any thoughts?

TIA,

John

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