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  <span><a href="../../IR/Exp/index.html#type-t">IR.Exp.t</a> <span class="arrow">&#45;&gt;</span></span>
  <span><span><a href="../Predicates/index.html#type-offset">Predicates.offset</a> list</span> option</span></span></code></div><div class="spec-doc"><p><code>is_root prop base_exp exp</code> checks whether <code>base_exp = exp.offlist</code> for some list of offsets <code>offlist</code>. If so, it returns <code>Some(offlist)</code>. Otherwise, it returns <code>None</code>. Assumes that <code>base_e