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  <div class="titlepage"><div><div><h1 style="clear: both"><code>const error_type &amp;assume_error() const &amp; noexcept</code></h1></div></div></div>
  <p>Narrow contract const lvalue reference observer of the stored error. <code>NoValuePolicy::narrow_error_check()</code> is first invoked, then the reference to the error is returned. As a valid default constructed error is always present, no undefined behaviour occurs 