g/stacktrace">Community Examples</a></div><hr><div class="binding"><span id="debug/step" class="binding-sym">debug/step</span> <span class="binding-type">cfunction</span> <span class="binding-type"><a href="https://github.com/janet-lang/janet/blob/c28df14/src/core/debug.c#L396">source</a></span> <pre class="binding-text">(debug/step fiber &amp;opt x)

Run a fiber for one virtual instruction of the Janet machine. Can optionally pass in a value that will be passed as the resuming value. Returns the signal val