(<span class="type-var">'context</span>, <span class="type-var">'f_in</span>, <span class="type-var">'f_proc_out</span>, <span class="type-var">'f_out</span>, <span class="type-var">'arg_payload</span>)</span> <a href="index.html#type-args_matcher">args_matcher</a></span> <span>&#45;&gt;</span> <span class="type-var">'f_in</span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'context</span>, <span class="type-var">'f_out</span>, <span class="type-var">'arg_payload</span>)</span> <a href="