TypeErr.InstrRef.t</a> <span>&#45;&gt;</span> <span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span> <span>&#45;&gt;</span> <span>(<span class="type-var">'c</span> * <a href="../InferredNullability/index.html#type-t">InferredNullability.t</a>)</span> <span>&#45;&gt;</span> <a href="../../IBase/Location/index.html#type-t">IBase.Location.t</a> <span>&#45;&gt;</span> <span class="type-var">'d</span> * <a href="../InferredNullability/index.html#type-t">InferredNullability.t</a>