From 08efb089bb9a1a9c77df6caefe15b44d6ab5b2d3 Mon Sep 17 00:00:00 2001
From: "simonpj@microsoft.com" <unknown>
Date: Tue, 6 Nov 2007 10:52:58 +0000
Subject: [PATCH] Improve error messages

---
 compiler/typecheck/TcDeriv.lhs |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/typecheck/TcDeriv.lhs b/compiler/typecheck/TcDeriv.lhs
index bbdd9b2..d414c6f 100644
--- a/compiler/typecheck/TcDeriv.lhs
+++ b/compiler/typecheck/TcDeriv.lhs
@@ -654,7 +654,7 @@ cond_mayDeriveDataTypeable (mayDeriveDataTypeable, _)
  | mayDeriveDataTypeable = Nothing
  | otherwise = Just why
   where
-    why  = ptext SLIT("You need -fglasgow-exts to derive an instance for this class")
+    why  = ptext SLIT("You need -XDeriveDataTypeable to derive an instance for this class")
 
 std_class_via_iso :: Class -> Bool
 std_class_via_iso clas	-- These standard classes can be derived for a newtype
-- 
1.7.10.4