</sect2>
- <sect2>
+ <sect2 id="extended-default-rules">
<title>Type defaulting in GHCi</title>
<indexterm><primary>Type default</primary></indexterm>
<indexterm><primary><literal>Show</literal> class</primary></indexterm>
numeric, <emphasis>or is <literal>Show</literal>,
<literal>Eq</literal>, or <literal>Ord</literal></emphasis>.</para></listitem>
</itemizedlist>
+ The same type-default behaviour can be enabled in an ordinary Haskell
+ module, using the flag <literal>-fextended-default-rules</literal>.
</para>
</sect2>
</sect1>