title: Help with odd plyr/doSMP warning
body: <p>I am trying to run the example for doSMP posted <a href="http://www.r-statistics.com/2010/09/using-the-plyr-1-2-package-parallel-processing-backend-with-windows/" rel="nofollow">here</a>: </p>
  
  <pre><code>require(plyr) # make sure you have 1.2 or later installed
  x &lt;- seq_len(20)
  wait &lt;- function(i) Sys.sleep(0.1)
  system.time(llply(x, wait))
  require(doSMP)
  workers &lt;- startWorkers(2) # My computer has 2 cores
  registerDoSMP(workers)
  system.time(llply(x, wait, .parallel = TRUE))
  </code></pre>
  
  <p>and I get the following warnings:</p>
  
  <pre><code>Warning messages:
  1: &lt;anonymous&gt;: ... may be used in an incorrect context: ‘.fun(piece, ...)’
  
  2: &lt;anonymous&gt;: ... may be used in an incorrect context: ‘.fun(piece, ...)’
  </code></pre>
  
  <p>What do these warnings mean, and should I worry about them?</p>
  
  <p>edit:</p>
  
  <pre><code>getRversion() = 2.12.2
  packageDescription("plyr", fields="Version") = 1.4
  packageDescription("doSMP", fields="Version") = 1.0-1
  </code></pre>