title: What's the difference between `as.name` and `sym`?
body: <p>I'm trying to wrap my head around standard, non-standard evaluation, quosures, etc. In many examples, I see passed string variable being transformed into <code>dplyr</code>-usable form either with <code>as.name</code> or with <code>sym</code> of <code>rlang</code> package. </p>
  
  <p>Are they interchangeable in pipes? What are the cases that will fail for one or the other?</p>