<title>Postfix operators</title>
<para>
-GHC allows a small extension to the syntax of left operator sections, which
-allows you to define postfix operators. The extension is this: the left section
+ The <option>-XPostfixOperators</option> flag enables a small
+extension to the syntax of left operator sections, which allows you to
+define postfix operators. The extension is this: the left section
<programlisting>
(e !)
</programlisting>
take only one argument, and that in turn allows you to write the function
postfix.
</para>
-<para>Since this extension goes beyond Haskell 98, it should really be enabled
-by a flag; but in fact it is enabled all the time. (No Haskell 98 programs
-change their behaviour, of course.)
-</para>
<para>The extension does not extend to the left-hand side of function
definitions; you must define such a function in prefix form.</para>