&#45;&gt;</span> <a href="../../../BO/BufferOverrunUtils/ModelEnv/index.html#type-model_env">BO.BufferOverrunUtils.ModelEnv.model_env</a> <span>&#45;&gt;</span> <span>ret:<span class="type-var">'b</span></span> <span>&#45;&gt;</span> <a href="../../../BO/BufferOverrunDomain/Mem/index.html#type-t">BO.BufferOverrunDomain.Mem.t</a> <span>&#45;&gt;</span> <span class="type-var">'a</span></code></dt><dt class="spec value" id="val-substring_from_index"><a href="#val-substring_from_index" class="anchor"></a><code>