From: simonmar <unknown>
Date: Fri, 27 Apr 2001 08:50:59 +0000 (+0000)
Subject: [project @ 2001-04-27 08:50:59 by simonmar]
X-Git-Tag: Approximately_9120_patches~2091
X-Git-Url: http://git.megacz.com/?a=commitdiff_plain;h=fdbdaeceab5cb254c866989c6b67eaf1dc2a45e5;p=ghc-hetmet.git

[project @ 2001-04-27 08:50:59 by simonmar]
add a note about requiring 'main' to be defined in module 'Main'.
---

diff --git a/ghc/docs/users_guide/ghci.sgml b/ghc/docs/users_guide/ghci.sgml
index 55e09bb..3f8783f 100644
--- a/ghc/docs/users_guide/ghci.sgml
+++ b/ghc/docs/users_guide/ghci.sgml
@@ -927,6 +927,21 @@ Prelude> :set -fno-glasgow-exts
     
     <variablelist>
       <varlistentry>
+	<term>GHCi complains about <function>main</function> not being
+	in scope when I load a module.</term>
+	<indexterm><primary><function>main</function></primary><secondary>with GHCi</secondary>
+	</indexterm>
+	<listitem>
+	  <para>You probably omitted the <literal>module</literal>
+	  declaration at the top of the module, which causes the
+	  module name to default to <literal>Main</literal>.  In
+	  Haskell, the <literal>Main</literal> module must define a
+	  function called <function>main</function>.  Admittedly this
+	  doesn't make a great deal of sense for an interpreter, but
+	  the rule was kept for compatibility with GHC.</para>
+	</listitem>
+
+      <varlistentry>
 	<term><literal>System.exit</literal> causes GHCi to exit!</term>
 	<indexterm><primary><literal>System.exit</literal></primary><secondary>in
 	GHCi</secondary></indexterm>