"arrow">&#45;&gt;</span></span> <a href="States/index.html#type-t">States.t</a></span></code></div><div class="spec-doc"><p><code>succs s q</code> returns the set of immediate successors in <code>s</code>, <i>i.e.</i> the set of state <code>q'</code> such that there exists a transition <code>(q,l,q')</code> in <code>R</code>. Raise Invalid_argument if <code>q</code> is not in <code>s</code>.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-succs'"><a href="#val-succs'" class="a