at prunes based on the types of the arguments. The assumptions lead to <code>exit_success</code>, while the negation of the assumptions leads to <code>exit_failure</code>.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-prune_spec_return"><a href="#val-prune_spec_return" class="anchor"></a><code><span><span class="keyword">val</span> prune_spec_return : 
  <span><span><span>(<span><a href="../../IR/Procdesc/index.html#type-t">IR.Procdesc.t</a> <a href="../ErlangEnvironment/ind