Fixed a badly defined pattern match

[ghc-hetmet.git] / docs / users_guide / glasgow_exts.xml

diff --git a/docs/users_guide/glasgow_exts.xml b/docs/users_guide/glasgow_exts.xml
index 36bb71c..61cff6e 100644 (file)
--- a/docs/users_guide/glasgow_exts.xml
+++ b/docs/users_guide/glasgow_exts.xml
@@ -277,8 +277,6 @@ documentation</ulink> describes all the libraries that come with GHC.
   </sect1>
 
 <!-- UNBOXED TYPES AND PRIMITIVE OPERATIONS -->
-<!--    included from primitives.sgml  -->
-<!-- &primitives; -->
 <sect1 id="primitives">
   <title>Unboxed types and primitive operations</title>
 
@@ -383,6 +381,13 @@ worse, the unboxed value might be larger than a pointer
 (<literal>Double&num;</literal> for instance).
 </para>
 </listitem>
+<listitem><para> You cannot define a newtype whose representation type
+(the argument type of the data constructor) is an unboxed type.  Thus,
+this is illegal:
+<programlisting>
+  newtype A = MkA Int#
+</programlisting>
+</para></listitem>
 <listitem><para> You cannot bind a variable with an unboxed type
 in a <emphasis>top-level</emphasis> binding.
 </para></listitem>