title: for loop - statement with no effect
body: <p>For some reason I'm getting an error: <code>statement with no effect</code> on this statement. </p>
  
  <pre><code>for (j = idx; j &lt; iter; j + increment) {
      printf("from loop idx = %i", (int)idx);
      punc(ctxt, j);
  }
  </code></pre>