Puppet users - Mar 2014 - file_line doesn't work with variables?

Given the following snippet from an init.pp file:

          $instance = 22

file_line { 'instance' :

              path => '/etc/init.d/myfile',

              line => 'INSTANCE=$instance',

              match => 'INSTANCE='

}

What I expect to happen is have the line in /etc/init.d/myfile change from 
INSTANCE=1 to INSTANCE=22, what happens is the file has INSTANCE=$instance 
any suggestions?

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