il - boolean indicating a tail call</pre><a href="https://janetdocs.org/debug/stack">Community Examples</a></div><hr><div class="binding"><span id="debug/stacktrace" class="binding-sym">debug/stacktrace</span> <span class="binding-type">cfunction</span>  <pre class="binding-text">(debug/stacktrace fiber &amp;opt err)

Prints a nice looking stacktrace for a fiber. Can optionally provide an error value to print the stack trace with. If `err` is nil or not provided, will skipp the error line. Returns the fiber