title: str_replace_all not working in pipeline
body: <p>Here's my code:</p>
  
  <pre><code>df &lt;- df %&gt;%
    filter(conditions x, y, and z) %&gt;%
    str_replace_all(string, pattern, replacement)
  </code></pre>
  
  <p>When doing this, I got the error:</p>
  
  <pre><code>Error in str_replace_all(., string, pattern, replacement) :
    unused argument("")
  </code></pre>
  
  <p>I know the code is not at all useful in terms of replication, as I've said before, I can't share the data, but assume the input was correct (I have since gotten it to work by mutating the variable instead).  The replacement was an empty string, but that ought not to matter as far as I know.</p>
  
  <p>I'm just curious why str_replace_all does not work in a pipeline, anyone have any insight?</p>