'a</span></span></code></div><div class="spec-doc"><p><code>dbg ~call ~retn ~rais function_name k</code> increases the indentation level and emits the <code>call</code> message, then invokes <code>k ()</code>, then decreases the indentation level and either emits the <code>retn</code> or <code>rais</code> message, depending on whether <code>k ()</code> returned normally or exceptionally. If tracing <code>function_name</code> is not enabled, nothing is printed, but the <code>call</code>, <code>retn</code>, a