From abb3a9faa88fad3562ac41a148dd683765f47565 Mon Sep 17 00:00:00 2001
From: Ian Lynagh <ian@well-typed.com>
Date: Thu, 1 Aug 2013 18:08:23 +0100
Subject: Add a warning for empty enumerations; fixes #7881

We now give a warning about enumerations like [5 .. 3] :: Int8.
---
 docs/users_guide/using.xml | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'docs')

diff --git a/docs/users_guide/using.xml b/docs/users_guide/using.xml
index 9e17bfb94b..7540279504 100644
--- a/docs/users_guide/using.xml
+++ b/docs/users_guide/using.xml
@@ -967,6 +967,7 @@ test.hs:(5,4)-(6,7):
     <option>-fwarn-duplicate-constraints</option>,
     <option>-fwarn-duplicate-exports</option>,
     <option>-fwarn-overflowed-literals</option>,
+    <option>-fwarn-empty-enumerations</option>,
     <option>-fwarn-missing-fields</option>,
     <option>-fwarn-missing-methods</option>,
     <option>-fwarn-lazy-unlifted-bindings</option>,
@@ -1225,6 +1226,18 @@ foreign import "&amp;f" f :: FunPtr t
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>-fwarn-empty-enumerations</option>:</term>
+        <listitem>
+          <indexterm><primary><option>-fwarn-empty-enumerations</option></primary>
+          </indexterm>
+          <para>
+              Causes a warning to be emitted if an enumeration is
+              empty, e.g. <literal>[5 .. 3]</literal>.
+          </para>
+        </listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><option>-fwarn-lazy-unlifted-bindings</option>:</term>
         <listitem>
-- 
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